{"id":177169,"date":"2026-08-13T08:57:33","date_gmt":"2026-08-13T08:57:33","guid":{"rendered":"https:\/\/pabau.com\/?p=177169"},"modified":"2026-08-13T08:57:36","modified_gmt":"2026-08-13T08:57:36","slug":"hcpcs-code-j1120","status":"publish","type":"post","link":"https:\/\/pabau.com\/nl\/procedure-codes\/hcpcs-code-j1120\/","title":{"rendered":"HCPCS Code J1120: Acetazolamide sodium injection billing guide"},"content":{"rendered":"\n<script type=\"application\/ld+json\">{\"@context\":\"https:\/\/schema.org\",\"@type\":\"MedicalWebPage\",\"headline\":\"HCPCS Code J1120: Acetazolamide sodium injection billing guide\",\"description\":\"HCPCS Code J1120 covers injection of acetazolamide sodium up to 500 mg. Complete billing guide: Medicare reimbursement, NDC crosswalk, ICD-10 pairings, and documentation requirements.\",\"url\":\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j1120\/\",\"audience\":{\"@type\":\"MedicalAudience\",\"audienceType\":\"Clinician\"},\"reviewedBy\":{\"@type\":\"Person\",\"name\":\"Dr Vanja Kitanova\",\"jobTitle\":\"Medical Reviewer\",\"affiliation\":{\"@type\":\"Organization\",\"name\":\"Pabau\"},\"knowsAbout\":[\"Medical Coding\",\"Clinical Documentation\",\"Healthcare Billing\",\"Clinical Safety\"],\"sameAs\":\"https:\/\/pabau.com\/blog\/author\/vanja\/\"},\"datePublished\":\"2026-08-10\",\"dateModified\":\"2026-08-13\"}<\/script>\n\n\n        <div id=\"key_takeaways\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/12\/Key-Takeaways-Icon.svg\" alt=\"Key takeaways\" height=\"42\" width=\"42\">\n                                <h3>Key takeaways<\/h3>\n            <\/div>\n            <div class=\"list\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>HCPCS Code J1120 covers the injection of acetazolamide sodium, up to 500 mg, and CMS maintains it under HCPCS Level II.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Medicare pays J1120 under Part B at average sales price plus 6 percent, and the rate changes every quarter.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Medicaid claims need the 11-digit NDC taken from the vial you used, and a missing NDC is the most common denial trigger.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#3D3D46\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p>Practice management software like Pabau flags a J1120 claim with missing NDC or diagnosis data before it is submitted.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<p class=\"wp-block-paragraph\">HCPCS Code J1120 covers the injection of acetazolamide sodium, up to 500 mg. CMS maintains it under HCPCS Level II, and Medicare pays it through Part B using average sales price pricing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Three problems cause most J1120 denials: a missing NDC, a diagnosis code that does not support the indication, and the wrong place of service. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This guide covers the reimbursement rate, the NDC crosswalk, ICD-10 pairings, documentation requirements, and the buy-and-bill workflow.<\/p>\n\n\n\n<h2 id=\"h-hcpcs-code-j1120-definition-and-quick-reference-details\" class=\"wp-block-heading\">HCPCS Code J1120: Definition and quick-reference details<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">HCPCS Code J1120 is a Level II code maintained by the Centers for Medicare and Medicaid Services (CMS). It reports the injection of acetazolamide sodium, up to 500 mg. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">It sits in the J-code series, which covers drugs given by injection or infusion that patients do not self-administer. Store J1120 in your <a href=\"https:\/\/pabau.com\/features\/claims-management-software\/\">claims management software<\/a> alongside the payer coverage rules that apply to it.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/billing_codes\/hcpcs-code-j1120\/automate-claims-through-healthcode.webp\" alt=\"Automate claims and billing in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s claims management tools submit and track J-code claims from the same record that holds the administration note.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Field<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Details<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">HCPCS Code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">J1120<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Official Description<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injection, acetazolamide sodium, up to 500 mg<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Drug Class<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Carbonic anhydrase inhibitor (CAI)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Code System<\/td>\n<td style=\"padding:12px 16px;color:#374151\">HCPCS Level II (CMS-maintained)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Dosage Unit<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Per administration up to 500 mg<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Status (2025\/2026)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Active; confirm via CMS HCPCS quarterly release files<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Billing Pathway<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Medicare Part B; buy-and-bill model<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<h2 id=\"h-acetazolamide-sodium-drug-overview-and-clinical-uses\" class=\"wp-block-heading\">Acetazolamide sodium: Drug overview and clinical uses<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Acetazolamide sodium is a carbonic anhydrase inhibitor. It blocks the enzyme carbonic anhydrase, which reduces bicarbonate formation and lowers fluid pressure in the eye, brain, and kidneys. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The injectable form is used in acute or inpatient settings where oral dosing is not practical. Practices running <a href=\"https:\/\/pabau.com\/industry\/iv-therapy-emr-software\/\">IV therapy EMR software<\/a> meet this drug alongside other infused agents, mainly in ophthalmology and neurology workflows.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The injectable form is approved for the conditions below. Each one has its own ICD-10-CM codes, covered in a dedicated section further down.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Glaucoma<\/strong>: Reduces intraocular pressure in open-angle and secondary glaucoma, and is used acutely when topical agents are not enough<\/li>\n\n\n\n<li><strong>Epilepsy and seizure disorders<\/strong>: Adjunctive anticonvulsant, mainly in absence seizures that do not respond to first-line agents<\/li>\n\n\n\n<li><strong>Altitude sickness<\/strong>: Speeds acclimatization by stimulating respiratory compensation, and is most often prescribed in <a href=\"https:\/\/pabau.com\/industry\/travel-clinic-software\/\">travel clinics<\/a><\/li>\n\n\n\n<li><strong>Edema<\/strong>: Treats drug-induced and congestive cardiac edema, usually as a short-course injection<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Coverage policies vary by indication. Medicare and commercial payers may restrict payment to a defined list of diagnoses, so check the applicable Local Coverage Determination (LCD) before you submit.<\/p>\n\n\n\n<h2 id=\"h-j1120-medicare-reimbursement-rates\" class=\"wp-block-heading\">J1120 Medicare reimbursement rates<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Medicare pays HCPCS Code J1120 under the average sales price (ASP) methodology, per 42 CFR 414.904. CMS updates ASP-based drug pricing quarterly, so the rate in force on the date of service is the one that applies. Current rates sit in the CMS Physician Fee Schedule lookup tool.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Key reimbursement facts for J1120 billing teams:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Payment in a physician office equals ASP plus 6 percent under the Part B drug payment formula<\/li>\n\n\n\n<li>Hospital outpatient settings are paid under the Outpatient Prospective Payment System (OPPS), which can produce a different rate<\/li>\n\n\n\n<li>Locality adjustments apply, so rates differ by geographic payment area<\/li>\n\n\n\n<li>Confirm the current quarter&#8217;s ASP pricing in the CMS ASP Drug Pricing Files before you submit<\/li>\n<\/ul>\n\n\n        <div id=\"pro_tip\">\n            <div class=\"img\">\n                <svg width=\"42\" height=\"42\" viewBox=\"0 0 42 42\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M12.6383 19.5238C12.6632 21.2071 12.8734 22.9926 12.0685 24.5523C11.0341 26.8917 8.45076 28.169 7.56292 30.5918C6.63082 33.1061 7.19505 36.185 9.31371 37.9786C10.929 39.5678 13.4183 39.9873 15.6061 39.5463C17.4592 39.073 19.1049 37.8388 19.9706 36.1608C20.781 34.7141 20.7866 32.9904 20.5293 31.3985C20.1006 29.3092 18.3775 27.8705 16.9807 26.362C14.8814 24.1005 14.6684 20.6854 15.595 17.8915C16.4331 15.4768 19.0026 14.2344 20.0425 11.9461C20.7202 10.6769 20.7506 9.20327 20.6068 7.81304C20.1864 5.40098 18.3139 3.23631 15.8716 2.56674C13.9742 2.03969 11.8224 2.30052 10.1739 3.37614C8.70522 4.34688 7.5878 5.86618 7.28356 7.58178C6.76081 9.82981 7.53525 12.2822 9.20307 13.9118C10.7658 15.4741 12.4806 17.2273 12.6383 19.5238Z\"\n                        fill=\"#2BADD4\" \/>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M22.7048 19.8387C22.6822 22.3279 24.4507 24.6234 26.7493 25.4682C28.0531 25.961 29.4725 25.9183 30.7989 25.5487C32.0575 24.9955 33.301 24.2237 34.0069 23.0092C34.8384 21.5811 35.2982 19.8286 34.7832 18.2094C34.3611 16.2507 32.8739 14.6541 31.0275 13.9426C28.6736 12.9595 25.8073 13.7942 24.1719 15.7001C23.2022 16.8366 22.6143 18.3326 22.7048 19.8387Z\"\n                        fill=\"#2BADD4\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"text\">\n                <h3>Pro Tip<\/h3>\n                <p>Check the CMS ASP Drug Pricing Files at the start of each quarter. J1120 rates update on January 1, April 1, July 1, and October 1. A claim priced from a prior quarter&#8217;s rate creates a shortfall you cannot bill back.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-place-of-service-and-asc-payment-status-for-j1120\" class=\"wp-block-heading\">Place of service and ASC payment status for J1120<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The place of service (POS) code on a J1120 claim decides which payment system applies and whether the drug is paid separately. The wrong POS is a frequent denial trigger.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Setting<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">POS Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Payment System<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Separate Drug Payment?<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Physician office<\/td>\n<td style=\"padding:12px 16px;color:#374151\">11<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Medicare Physician Fee Schedule (ASP+6%)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Yes<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Outpatient hospital<\/td>\n<td style=\"padding:12px 16px;color:#374151\">22<\/td>\n<td style=\"padding:12px 16px;color:#374151\">OPPS (packaged or separately payable APC)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Depends on APC status<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Ambulatory surgical center<\/td>\n<td style=\"padding:12px 16px;color:#374151\">24<\/td>\n<td style=\"padding:12px 16px;color:#374151\">ASC payment system<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Check current ASC indicator<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Emergency department<\/td>\n<td style=\"padding:12px 16px;color:#374151\">23<\/td>\n<td style=\"padding:12px 16px;color:#374151\">OPPS<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Depends on APC status<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">The ASC payment indicator for J1120 can change with each annual OPPS and ASC final rule. Verify the current indicator with CMS before you bill in an ASC. Coders can check code-level ASC status in the <a href=\"https:\/\/www.aapc.com\/codes\/hcpcs-codes-range\/\" target=\"_blank\" rel=\"nofollow noopener\">AAPC Codify HCPCS lookup<\/a>.<\/p>\n\n\n\n<h2 id=\"h-buy-and-bill-billing-for-hcpcs-code-j1120\" class=\"wp-block-heading\">Buy-and-bill billing for HCPCS Code J1120<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">J1120 is usually billed under the buy-and-bill model. The practice buys acetazolamide sodium, administers it to the patient, and then bills the payer. Your margin is the difference between what the wholesaler charged you and what Medicare pays, so each step below has a financial consequence.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Acquire the drug<\/strong>: Buy acetazolamide sodium injectable from a wholesaler or group purchasing organization. Acquisition cost varies by contract, so never bill from a fixed published price.<\/li>\n\n\n\n<li><strong>Administer to the patient<\/strong>: Record the drug name, dose, route, quantity, and date of administration in the clinical record before anything reaches the claim.<\/li>\n\n\n\n<li><strong>Submit the J1120 claim<\/strong>: Include the correct POS code, the NDC for the product used, the ICD-10-CM codes supporting medical necessity, and the units administered.<\/li>\n\n\n\n<li><strong>Reconcile payment against cost<\/strong>: ASP plus 6 percent is designed to approximate cost plus a modest margin. Compare the two each quarter and flag any shortfall to your billing manager.<\/li>\n<\/ol>\n\n\n\n<p class=\"wp-block-paragraph\">Acquisition costs move with wholesaler pricing and purchasing contracts, independently of ASP updates. Build the quarterly comparison into your billing workflow so you catch margin compression early.<\/p>\n\n\n\n<h2 id=\"h-j1120-ndc-crosswalk\" class=\"wp-block-heading\">J1120 NDC crosswalk<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">National Drug Code (NDC) reporting is required on Medicaid claims and increasingly requested by commercial payers. A J1120 claim sent to Medicaid without an NDC almost always comes back denied. <\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Your <a href=\"https:\/\/pabau.com\/features\/prescription-management-software\/\">prescription management software<\/a> should capture the 11-digit NDC at the point of administration, not at the billing stage.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/billing_codes\/hcpcs-code-j1120\/streamline-your-repeat-prescriptions.webp\" alt=\"Prescription records in Pabau showing drug, dose and repeat details\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s prescription records hold the drug, dose, and NDC detail a J1120 claim needs, so nothing is retyped at billing time.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Key NDC reporting rules for J1120:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Report the 11-digit NDC in 5-4-2 format on CMS-1500 claims, in Box 24A narrative or as an attachment, depending on payer instructions<\/li>\n\n\n\n<li>NDCs for acetazolamide sodium injectable vary by manufacturer and package size, so check the vial rather than a generic database entry<\/li>\n\n\n\n<li>The <a href=\"https:\/\/www.fda.gov\/drugs\/drug-approvals-and-databases\/national-drug-code-directory\" target=\"_blank\" rel=\"nofollow noopener\">FDA NDC Directory<\/a> is the authoritative source for confirming a valid NDC number<\/li>\n\n\n\n<li>Some commercial payers want the NDC qualifier &#8220;N4&#8221; in front of the code on electronic 837P claims<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Verify the NDC against the vial in front of you, not a formulary default. Manufacturers and package sizes change, and the claim has to match the product that was actually administered.<\/p>\n\n\n\n<h2 id=\"h-icd-10-diagnosis-codes-that-support-medical-necessity-for-j1120\" class=\"wp-block-heading\">ICD-10 diagnosis codes that support medical necessity for J1120<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Every J1120 claim needs at least one ICD-10-CM diagnosis code that establishes medical necessity. The table below lists the codes most often paired with J1120, grouped by clinical indication. Each one matches an FDA-approved use of acetazolamide sodium injectable.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Indication<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">ICD-10-CM Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Glaucoma<\/td>\n<td style=\"padding:12px 16px;color:#374151\">H40.10X0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Open-angle glaucoma, unspecified, unspecified stage<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Glaucoma<\/td>\n<td style=\"padding:12px 16px;color:#374151\">H40.20X0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified primary angle-closure glaucoma, unspecified stage<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Epilepsy<\/td>\n<td style=\"padding:12px 16px;color:#374151\">G40.309<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Generalized idiopathic epilepsy and epileptic syndromes, not intractable, without status epilepticus<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Altitude sickness<\/td>\n<td style=\"padding:12px 16px;color:#374151\">T70.20XA<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unspecified effects of high altitude, initial encounter<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Edema<\/td>\n<td style=\"padding:12px 16px;color:#374151\">R60.0<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Localized edema<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Edema<\/td>\n<td style=\"padding:12px 16px;color:#374151\">R60.9<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Edema, unspecified<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Payer policies can narrow this list further. Check the LCD or coverage determination for your Medicare Administrative Contractor (MAC) before you submit. The <a href=\"https:\/\/clinicaltables.nlm.nih.gov\/apidoc\/hcpcs\/v3\/doc.html\" target=\"_blank\" rel=\"nofollow noopener\">NLM Clinical Table Search API<\/a> serves HCPCS and ICD data programmatically, which is useful for automated eligibility checks.<\/p>\n\n\n\n<h2 id=\"h-documentation-requirements-for-j1120\" class=\"wp-block-heading\">Documentation requirements for J1120<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Thin clinical documentation is the second most common denial reason for J-code drug claims, after NDC errors. Every J1120 claim needs a record that establishes medical necessity and shows the drug was administered. <a href=\"https:\/\/pabau.com\/features\/patient-intake-software\/\">Digital intake forms<\/a> tied to the encounter capture that detail at the point of care rather than at billing time.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pabau.com\/blog\/medical-forms-at-your-healthcare-practice\/\">Medical forms<\/a> that feed the billing module directly shorten the distance between the note and the claim.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"https:\/\/cdn.pabau.com\/cdn\/attachments\/pulse\/content-engine\/billing_codes\/hcpcs-code-j1120\/medical-forms-new-medical-form-with-components-2x.webp\" alt=\"Building a new medical form from components in Pabau\"\/><figcaption class=\"wp-element-caption\"><em>Pabau&#8217;s form builder lets you add the order, dose, and NDC fields a J1120 claim needs, so the note is complete before billing sees it.<\/em><\/figcaption><\/figure>\n\n\n\n<div style=\"height:35px;width:800px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">Required documentation elements for a valid J1120 claim:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Physician order<\/strong>: A written order naming acetazolamide sodium, the dose, the route, and the frequency<\/li>\n\n\n\n<li><strong>Diagnosis linkage<\/strong>: The ICD-10-CM codes in the encounter note must match the codes on the claim<\/li>\n\n\n\n<li><strong>Drug name, dose, route, and quantity<\/strong>: Recorded in the administration record, with the amount actually drawn and given<\/li>\n\n\n\n<li><strong>Date of service<\/strong>: The administration date in the clinical note has to match the claim date exactly<\/li>\n\n\n\n<li><strong>NDC of the product used<\/strong>: Taken from the vial at the time of administration, never from a formulary default<\/li>\n\n\n\n<li><strong>Administration notes<\/strong>: A short clinical justification confirming the indication and the response to earlier treatment where relevant<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">Practices subject to HIPAA audits should note that missing documentation on a drug claim can trigger a wider medical record review. Read our guide to <a href=\"https:\/\/pabau.com\/blog\/hipaa-compliance-for-medical-offices\/\">HIPAA compliance<\/a> for the retention obligations that sit alongside these billing rules.<\/p>\n\n\n\n<h2 id=\"h-related-and-comparable-hcpcs-codes\" class=\"wp-block-heading\">Related and comparable HCPCS codes<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Coders who bill J1120 usually handle other injectable J-codes in the same batch. <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j1364\/\">J1364<\/a> and <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0600\/\">J0600<\/a> follow the same NDC, unit, and place-of-service rules, so a template built for one carries over.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">HCPCS Code<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Description<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Drug Class<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">J1120<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injection, acetazolamide sodium, up to 500 mg<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Carbonic anhydrase inhibitor<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">J3490<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Unclassified drugs (unlisted injectable drug)<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Catch-all for drugs without a specific J-code<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">J1938<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injection, furosemide, per 1 mg<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Loop diuretic (edema treatment)<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">J3480<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injection, potassium chloride, per 2 mEq<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Electrolyte replenishment<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">J0153<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Injection, adenosine, 1 mg<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Antiarrhythmic and pharmacologic stress agent<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n<p class=\"wp-block-paragraph\">Two changes are worth noting if you built this list before 2026. CMS deleted J1940 for furosemide with effect from March 31, 2025, and J1938 now carries generic furosemide on a per-milligram basis. Arbutamine, billed under <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0395\/\">J0395<\/a>, was discontinued in the Q1 2026 HCPCS update and is no longer billable.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Adenosine, billed under <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0153\/\">J0153<\/a>, is the pharmacologic stress agent still in routine use. Descriptions and status change with every annual HCPCS update, so validate each code before you build a billing template around it.<\/p>\n\n\n\n<h2 id=\"h-common-billing-errors-and-how-to-avoid-them\" class=\"wp-block-heading\">Common billing errors and how to avoid them<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Denials for HCPCS Code J1120 cluster around a small number of recurring errors. Most are preventable with workflow controls and <a href=\"https:\/\/pabau.com\/blog\/ehr-integration\/\">EHR integration<\/a> that connects the clinical record to the claim before submission.<\/p>\n\n\n\n<table style=\"width:100%;border-collapse:separate;border-spacing:0;border-radius:12px;overflow:hidden;font-size:15px;line-height:1.5;margin:1.5em 0 2em;box-shadow:0 2px 12px rgba(0,0,0,0.08)\">\n<thead>\n<tr>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Error Type<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Why It Happens<\/th>\n<th style=\"background:#121D36;color:#fff;padding:14px 16px;text-align:left;font-weight:600;font-size:14px;letter-spacing:0.3px;border-bottom:2px solid #2BADD4\">Prevention<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Missing or incorrect NDC<\/td>\n<td style=\"padding:12px 16px;color:#374151\">NDC not captured at administration, or a formulary default used instead of the actual vial<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Record the NDC from the vial at administration, then validate the 11-digit format before submission<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Wrong place of service code<\/td>\n<td style=\"padding:12px 16px;color:#374151\">POS entered from a template rather than the actual service location<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Auto-populate POS from the encounter location, then audit quarterly<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Weak diagnosis linkage<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The ICD-10 code on the claim does not match the diagnosis in the clinical note<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Pull diagnosis codes straight from the encounter note and never recode at billing<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0;background:#F9FAFB\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Incorrect dosage units<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Billing multiple units when the code already covers up to 500 mg per administration<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Treat the full dose up to 500 mg as one unit, and review the units field before submission<\/td>\n<\/tr>\n<tr style=\"border-bottom:1px solid #E8ECF0\">\n<td style=\"padding:12px 16px;font-weight:600;color:#121D36\">Stale reimbursement rates<\/td>\n<td style=\"padding:12px 16px;color:#374151\">The billing system is not updated on the quarterly ASP cycle<\/td>\n<td style=\"padding:12px 16px;color:#374151\">Schedule a quarterly update task aligned to the CMS ASP release dates<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n        <div id=\"pro_tip\">\n            <div class=\"img\">\n                <svg width=\"42\" height=\"42\" viewBox=\"0 0 42 42\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M12.6383 19.5238C12.6632 21.2071 12.8734 22.9926 12.0685 24.5523C11.0341 26.8917 8.45076 28.169 7.56292 30.5918C6.63082 33.1061 7.19505 36.185 9.31371 37.9786C10.929 39.5678 13.4183 39.9873 15.6061 39.5463C17.4592 39.073 19.1049 37.8388 19.9706 36.1608C20.781 34.7141 20.7866 32.9904 20.5293 31.3985C20.1006 29.3092 18.3775 27.8705 16.9807 26.362C14.8814 24.1005 14.6684 20.6854 15.595 17.8915C16.4331 15.4768 19.0026 14.2344 20.0425 11.9461C20.7202 10.6769 20.7506 9.20327 20.6068 7.81304C20.1864 5.40098 18.3139 3.23631 15.8716 2.56674C13.9742 2.03969 11.8224 2.30052 10.1739 3.37614C8.70522 4.34688 7.5878 5.86618 7.28356 7.58178C6.76081 9.82981 7.53525 12.2822 9.20307 13.9118C10.7658 15.4741 12.4806 17.2273 12.6383 19.5238Z\"\n                        fill=\"#2BADD4\" \/>\n                    <path fill-rule=\"evenodd\" clip-rule=\"evenodd\"\n                        d=\"M22.7048 19.8387C22.6822 22.3279 24.4507 24.6234 26.7493 25.4682C28.0531 25.961 29.4725 25.9183 30.7989 25.5487C32.0575 24.9955 33.301 24.2237 34.0069 23.0092C34.8384 21.5811 35.2982 19.8286 34.7832 18.2094C34.3611 16.2507 32.8739 14.6541 31.0275 13.9426C28.6736 12.9595 25.8073 13.7942 24.1719 15.7001C23.2022 16.8366 22.6143 18.3326 22.7048 19.8387Z\"\n                        fill=\"#2BADD4\" \/>\n                <\/svg>\n            <\/div>\n            <div class=\"text\">\n                <h3>Pro Tip<\/h3>\n                <p>Build a J-code checklist for every injectable your practice administers: NDC captured, POS confirmed, ICD-10 linked, units verified, and ASP rate current. Running that five-point check before batch submission stops the most common denials without slowing anyone down.<\/p>\n            <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-how-claims-management-software-prevents-j1120-denials\" class=\"wp-block-heading\">How claims management software prevents J1120 denials<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">In most practices the three fields that decide a J1120 claim live in three different places. A nurse writes the vial details on an administration record, the physician codes the encounter, and a biller retypes both into the claim. Every hand-off is a chance for one field to go missing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Practice management software like Pabau keeps those fields on one patient record. The administration note captures the drug, dose, route, and NDC at the point of care. The diagnosis carries through from the encounter note to the claim without being retyped.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Pre-submission rules then check each J1120 claim for a missing NDC, a POS mismatch, or a diagnosis that does not support the indication. The claim is corrected before it leaves the practice. Your team then spends its time on genuine exceptions, not on chasing vial details a week after the appointment.<\/p>\n\n\n        <div id=\"book_a_demo\">\n            <div class=\"left-side\">\n                <div class=\"logo\">\n                    <img decoding=\"async\"\n                        src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Logo.svg\"\n                        alt=\"Logo\"\n                        loading=\"lazy\"\n                    \/>\n                <\/div>\n\n                <h3 class=\"heading\">\n                    Stop chasing J-code denials                <\/h3>\n\n                <p class=\"description\">\n                    Pabau&#8217;s claims management tools let you build pre-submission validation rules for J1120 and other drug codes. Each rule flags missing NDC data, place-of-service errors, and weak diagnosis linkage before claims leave the practice.                <\/p>\n\n                <div class=\"button-group\">\n                    <a href=\"\/book-demo\/\" class=\"btn btn-scale-effect btn-cta-color btn-md\">\n                        <span class=\"btn-text\">Book a demo<\/span>\n                        <div class=\"btn-icon btn-icon-right\" aria-hidden=\"true\">\n                            <svg\n                                width=\"14\"\n                                height=\"12\"\n                                viewBox=\"0 0 14 12\"\n                                fill=\"none\"\n                                xmlns=\"http:\/\/www.w3.org\/2000\/svg\"\n                            >\n                                <path\n                                    d=\"M0.75 4.77295C0.335786 4.77295 0 5.10874 0 5.52295C0 5.93716 0.335786 6.27295 0.75 6.27295V5.52295V4.77295ZM13.2803 6.05328C13.5732 5.76039 13.5732 5.28551 13.2803 4.99262L8.50736 0.219648C8.21447 -0.073245 7.73959 -0.073245 7.4467 0.219648C7.15381 0.512542 7.15381 0.987415 7.4467 1.28031L11.6893 5.52295L7.4467 9.76559C7.15381 10.0585 7.15381 10.5334 7.4467 10.8263C7.73959 11.1191 8.21447 11.1191 8.50736 10.8263L13.2803 6.05328ZM0.75 5.52295V6.27295L12.75 6.27295V5.52295V4.77295L0.75 4.77295V5.52295Z\"\n                                    fill=\"currentColor\"\n                                ><\/path>\n                            <\/svg>\n                        <\/div>\n                    <\/a>\n                <\/div>\n            <\/div>\n\n            <div class=\"right-side\">\n                <img decoding=\"async\"\n                    src=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/01\/Home-Page-Concept-4.webp\"\n                    alt=\"Pabau claims management dashboard\"\n                    loading=\"lazy\"\n                \/>\n            <\/div>\n        <\/div>\n        \n\n\n<h2 id=\"h-conclusion\" class=\"wp-block-heading\">Conclusion<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">J1120 pays reliably once the vial details, the diagnosis, and the place of service reach the claim unchanged. Fix that path once and these denials stop being a monthly chore.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The trade-off worth remembering is the quarterly one. ASP moves every three months, while your acquisition cost moves on its own schedule. A code that paid well in January can be underwater by July, so put the reconciliation in the calendar.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/pabau.com\/book-demo\/\">Book a demo<\/a> to see how Pabau captures NDC and diagnosis data at the point of administration. Your team can then validate J-code claims before they leave the practice.<\/p>\n\n\n        <div id=\"expert_picks\">\n            <div class=\"header\">\n                                    <img decoding=\"async\" src=\"https:\/\/pabau.com\/wp-content\/uploads\/2025\/11\/Expert-Picks.svg\" alt=\"Continue your research\" height=\"42\" width=\"42\">\n                                <h3>Continue your research<\/h3>\n            <\/div>\n            <div class=\"content\">\n                                                            <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Billing another injectable in the same batch?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0585\/\">J0585<\/a> sets out the unit reporting and documentation a per-unit drug code needs.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Want a second worked example of NDC capture?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0735\/\">J0735<\/a> covers the same place-of-service and NDC rules on a different injectable.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Counting units on a dose-range code?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j0630\/\">J0630<\/a> shows how unit counting works when one code covers a range of doses.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Billing a high-cost specialty drug?<\/strong> <a href=\"https:\/\/pabau.com\/procedure-codes\/hcpcs-code-j1322\/\">J1322<\/a> walks through the documentation an expensive biologic claim has to carry.<\/p>\n                        <\/div>\n                                                                                <div class=\"item\">\n                            <div>\n                                <svg width=\"20\" height=\"27\" viewBox=\"0 0 20 27\" fill=\"none\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n                                    <path\n                                        d=\"M18.6223 14.3857C19.1246 13.8975 19.1246 13.1045 18.6223 12.6162L12.1938 6.36621C11.6915 5.87793 10.8759 5.87793 10.3737 6.36621C9.87143 6.85449 9.87143 7.64746 10.3737 8.13574L14.6125 12.2529H2.28571C1.57455 12.2529 1 12.8115 1 13.5029C1 14.1943 1.57455 14.7529 2.28571 14.7529H14.6085L10.3777 18.8701C9.87545 19.3584 9.87545 20.1514 10.3777 20.6396C10.8799 21.1279 11.6955 21.1279 12.1978 20.6396L18.6263 14.3896L18.6223 14.3857Z\"\n                                        fill=\"#54B2D3\" \/>\n                                <\/svg>\n                            <\/div>\n                            <p><strong>Comparing claim scrubbing tools?<\/strong> <a href=\"https:\/\/pabau.com\/blog\/claims-management-software-pabau-vs-waystar\/\">Pabau vs Waystar<\/a> compares how each platform validates claims before they are submitted.<\/p>\n                        <\/div>\n                                                <\/div>\n        <\/div>\n    \n\n\n<h2 id=\"h-frequently-asked-questions\" class=\"wp-block-heading\">Frequently asked questions<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1786603203388\"><h3 class=\"schema-faq-question\">What is HCPCS Code J1120 used for?<\/h3> <p class=\"schema-faq-answer\">HCPCS Code J1120 reports the injection of acetazolamide sodium, up to 500 mg. Medicare Part B and most commercial payers accept it when the drug is given by injection. Covered indications include glaucoma, epilepsy, altitude sickness, and edema.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786603203389\"><h3 class=\"schema-faq-question\">What is the Medicare reimbursement rate for J1120?<\/h3> <p class=\"schema-faq-answer\">Medicare pays J1120 at average sales price plus 6 percent in physician office settings, under the Part B drug payment formula. Rates change every quarter. Check the current quarter in the CMS ASP Drug Pricing Files or the Physician Fee Schedule lookup tool. A stale rate creates a shortfall you cannot bill back.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786603203390\"><h3 class=\"schema-faq-question\">Is J1120 covered in an ambulatory surgical center (ASC)?<\/h3> <p class=\"schema-faq-answer\">J1120 may be payable in an ASC, depending on the ASC payment indicator CMS currently assigns it. That status can change with each annual OPPS and ASC final rule. Verify the indicator before you bill in an ASC, because coverage there is separate from physician office and outpatient hospital coverage.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786603203391\"><h3 class=\"schema-faq-question\">Is J1120 still active in 2025 and 2026?<\/h3> <p class=\"schema-faq-answer\">J1120 appears as active in 2026 HCPCS code listings. Confirm the current status in the official CMS HCPCS quarterly release files at the start of each year and after every quarterly update. Billing a retired or redefined code returns a denial.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786603203392\"><h3 class=\"schema-faq-question\">What documentation is required to bill J1120?<\/h3> <p class=\"schema-faq-answer\">A valid J1120 claim needs a physician order and the ICD-10-CM diagnosis code that matches the clinical note. The administration record has to carry the drug name, the dose, the NDC from the vial used, and the date of service. Add a brief note on medical necessity. Missing any one of these is grounds for denial or audit.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1786603203393\"><h3 class=\"schema-faq-question\">Which HCPCS codes should coders know alongside J1120?<\/h3> <p class=\"schema-faq-answer\">The codes most often referenced alongside J1120 are J3490 for unclassified injectable drugs, J1938 for furosemide, and J3480 for potassium chloride. J3490 is the catch-all when no specific J-code applies. It carries extra documentation and draws closer payer scrutiny, so use it only when nothing else fits.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>HCPCS Code J1120 covers the injection of acetazolamide sodium, up to 500 mg. CMS maintains it under HCPCS Level II, and Medicare pays it through Part B using average sales price pricing. Three problems cause most J1120 denials: a missing NDC, a diagnosis code that does not support the indication, and the wrong place of [&hellip;]<\/p>\n","protected":false},"author":83,"featured_media":177166,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_linkdex":"91","_yoast_wpseo_content_score":"90","_yoast_wpseo_is_cornerstone":"","_yoast_wpseo_keywordsynonyms":"[\"\",\"\",\"\",\"\",\"\",\"\"]","_yoast_wpseo_focuskw_text_input":"","_seo_original_html":"","footnotes":""},"categories":[1433,1548],"tags":[1582,1619,1625,2956],"class_list":["post-177169","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-billing-codes","category-hcpcs","tag-hcpcs","tag-hcpcs-billing","tag-j-codes","tag-ndc-reporting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v28.2 (Yoast SEO v28.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>HCPCS Code J1120: How to bill acetazolamide without denials<\/title>\n<meta name=\"description\" content=\"J1120 covers acetazolamide sodium injection up to 500 mg, paid at ASP plus 6%. A missing NDC is the top denial trigger.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/pabau.com\/nl\/procedure-codes\/hcpcs-code-j1120\/\" \/>\n<meta property=\"og:locale\" content=\"nl_NL\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"HCPCS Code J1120: How to bill acetazolamide without denials\" \/>\n<meta property=\"og:description\" content=\"J1120 covers acetazolamide sodium injection up to 500 mg, paid at ASP plus 6%. A missing NDC is the top denial trigger.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/pabau.com\/nl\/procedure-codes\/hcpcs-code-j1120\/\" \/>\n<meta property=\"og:site_name\" content=\"Pabau\" \/>\n<meta property=\"article:publisher\" content=\"https:\/\/www.facebook.com\/Pabau\/\" \/>\n<meta property=\"article:published_time\" content=\"2026-08-13T08:57:33+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2026-08-13T08:57:36+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/pabau.com\/wp-content\/uploads\/2026\/08\/hcpcs-code-j1120.webp\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"630\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/webp\" \/>\n<meta name=\"author\" content=\"Anja Dodevska\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:site\" content=\"@pabaucrm\" \/>\n<meta name=\"twitter:label1\" content=\"Geschreven door\" \/>\n\t<meta name=\"twitter:data1\" content=\"Anja Dodevska\" \/>\n\t<meta name=\"twitter:label2\" content=\"Geschatte leestijd\" \/>\n\t<meta name=\"twitter:data2\" content=\"12 minuten\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/\"},\"author\":{\"name\":\"Anja Dodevska\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#\\\/schema\\\/person\\\/f2e43b25ed02313e8781f0f4507398b9\"},\"headline\":\"HCPCS Code J1120: Acetazolamide sodium injection billing guide\",\"datePublished\":\"2026-08-13T08:57:33+00:00\",\"dateModified\":\"2026-08-13T08:57:36+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/\"},\"wordCount\":2353,\"publisher\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#organization\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/hcpcs-code-j1120.webp\",\"keywords\":[\"Hcpcs\",\"Hcpcs Billing\",\"J Codes\",\"Ndc Reporting\"],\"articleSection\":[\"Billing Codes\",\"HCPCS\"],\"inLanguage\":\"nl-NL\"},{\"@type\":[\"WebPage\",\"FAQPage\"],\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/\",\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/\",\"name\":\"HCPCS Code J1120: How to bill acetazolamide without denials\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#website\"},\"primaryImageOfPage\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#primaryimage\"},\"image\":{\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/08\\\/hcpcs-code-j1120.webp\",\"datePublished\":\"2026-08-13T08:57:33+00:00\",\"dateModified\":\"2026-08-13T08:57:36+00:00\",\"description\":\"J1120 covers acetazolamide sodium injection up to 500 mg, paid at ASP plus 6%. 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It combines scheduling, electronic health records, clinical forms, payments, marketing automation, reporting, and patient engagement tools into one secure cloud system to help practices streamline operations and grow their business.\",\"foundingDate\":\"2011-10-20\",\"numberOfEmployees\":{\"@type\":\"QuantitativeValue\",\"minValue\":\"201\",\"maxValue\":\"500\"}},{\"@type\":\"Person\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/#\\\/schema\\\/person\\\/f2e43b25ed02313e8781f0f4507398b9\",\"name\":\"Anja Dodevska\",\"image\":{\"@type\":\"ImageObject\",\"inLanguage\":\"nl-NL\",\"@id\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/cropped-CE0C072E-91B7-4BB7-BD27-D1E3B38ED0CA-scaled-1-96x96.jpg\",\"url\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/cropped-CE0C072E-91B7-4BB7-BD27-D1E3B38ED0CA-scaled-1-96x96.jpg\",\"contentUrl\":\"https:\\\/\\\/pabau.com\\\/wp-content\\\/uploads\\\/2026\\\/06\\\/cropped-CE0C072E-91B7-4BB7-BD27-D1E3B38ED0CA-scaled-1-96x96.jpg\",\"caption\":\"Anja Dodevska\"},\"description\":\"Anja Dodevska writes about healthcare, dermatology, and the day-to-day realities of running a medical practice for Pabau. She enjoys breaking down complex topics into clear, accessible content and has a soft spot for the often-overlooked aspects of clinic life. When she's not writing, she's exploring cafes, walking her dog, or spending time with friends and family.\",\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/blog\\\/author\\\/anja-dodevska\\\/\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203388\",\"position\":1,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203388\",\"name\":\"What is HCPCS Code J1120 used for?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"HCPCS Code J1120 reports the injection of acetazolamide sodium, up to 500 mg. Medicare Part B and most commercial payers accept it when the drug is given by injection. Covered indications include glaucoma, epilepsy, altitude sickness, and edema.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203389\",\"position\":2,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203389\",\"name\":\"What is the Medicare reimbursement rate for J1120?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Medicare pays J1120 at average sales price plus 6 percent in physician office settings, under the Part B drug payment formula. Rates change every quarter. Check the current quarter in the CMS ASP Drug Pricing Files or the Physician Fee Schedule lookup tool. A stale rate creates a shortfall you cannot bill back.\",\"inLanguage\":\"nl-NL\"},\"inLanguage\":\"nl-NL\"},{\"@type\":\"Question\",\"@id\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203390\",\"position\":3,\"url\":\"https:\\\/\\\/pabau.com\\\/nl\\\/procedure-codes\\\/hcpcs-code-j1120\\\/#faq-question-1786603203390\",\"name\":\"Is J1120 covered in an ambulatory surgical center (ASC)?\",\"answerCount\":1,\"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"J1120 may be payable in an ASC, depending on the ASC payment indicator CMS currently assigns it. That status can change with each annual OPPS and ASC final rule. 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