CPT code 82306: Vitamin D 25-hydroxy, coverage, fee schedule

Key takeaways

CPT code 82306 describes Vitamin D; 25 hydroxy testing, the 25-hydroxyvitamin D assay used to assess a patient’s vitamin D status.

Medicare covers CPT 82306 only when it is medically necessary under Billing and Coding Article A57718. Routine screening in healthy patients is not covered.

The 2026 Medicare national average reimbursement for CPT 82306 is roughly $17-19, and rates vary by MAC jurisdiction and place of service.

Practice management software like Pabau automates 82306 claim submission, eligibility checks, and ERA processing through the Claim.MD clearinghouse.

CPT code 82306 is the AMA-maintained code for measuring 25-hydroxyvitamin D, the primary circulating form of the vitamin. Labs report it to assess a patient’s vitamin D status. The official descriptor reads: Vitamin D; 25 hydroxy, includes fraction(s), if performed.

The “includes fraction(s), if performed” language means the code covers total 25-hydroxyvitamin D measurement. Any sub-fractionation, meaning D2 and D3 reported separately, is bundled into the single code. Billing a separate code for each fraction is incorrect and may trigger a claim edit.

CPT 82306 vs CPT 82652: Key differences

Confusing these two codes is one of the most common upcoding errors in lab billing. CPT 82306 measures the storage form of vitamin D. CPT 82652 measures the active hormone form. They answer different clinical questions and carry different coverage rules.

Billing 82652 when 82306 was clinically appropriate is an upcoding risk. Payers may apply a National Correct Coding Initiative (NCCI) edit if both tests are ordered on the same date. They then bundle the pair and pay for one.

ICD-10 codes that support medical necessity for CPT 82306

Every CPT 82306 claim needs a supporting ICD-10-CM diagnosis code that establishes medical necessity. Billing and Coding Article A57718 and most commercial payer policies recognize the same core set of conditions. Missing or unsupported diagnosis codes are the leading cause of 82306 denials. Our ICD-10-CM code library carries the full descriptors, and the ICD List lookup confirms billable status before you submit.

Always document the specific diagnosis in the medical record before ordering the test. A code that maps to screening or examination rather than an active condition typically fails medical necessity review. Capture the patient’s active conditions during eligibility verification, before the requisition leaves the practice.

Medicare coverage and medical necessity requirements

Medicare coverage for CPT 82306 is set out in Billing and Coding Article A57718, which CMS maintains alongside LCD L36692. The article establishes that vitamin D 25-hydroxy testing is covered only when it is medically necessary for diagnosing or treating a specific condition.

Covered indications

Medicare and most commercial payers cover CPT 82306 when the patient carries one of the qualifying conditions below. Each ordering event has to map to a documented active diagnosis, not to a risk factor.

• Vitamin D deficiency or insufficiency with documented clinical signs
• Osteoporosis or metabolic bone disease under active management
• Chronic kidney disease (CKD, any stage)
• Malabsorption syndromes including celiac disease, short bowel syndrome, and post-bariatric states
• Hypoparathyroidism or hyperparathyroidism under evaluation
• Active rickets or osteomalacia
• Inflammatory bowel disease with nutritional monitoring
• Granulomatous diseases such as sarcoidosis (ordered to evaluate hypercalcemia risk)

Non-covered scenarios and limitations

Routine population screening is the most common reason for denial. Medicare does not cover CPT 82306 ordered as a preventive wellness test in an otherwise healthy patient without a qualifying diagnosis. Common denied scenarios include the following.

• Annual wellness visit with no documented vitamin D-related condition
• Screening in patients without symptoms or documented risk factors
• Monitoring in patients on vitamin D supplementation without an underlying disease diagnosis
• Repeat testing within a short interval (typically less than three months) without clinical justification

Denials like these cost more to rework than the test pays. A steady denial management routine helps billing teams catch the pattern before it repeats. Five checkpoints decide whether an 82306 claim clears, and any one of them can sink it.

Commercial payer policies for CPT 82306

Commercial payers broadly follow the Medicare coverage framework but apply their own medical policy language. Their criteria are similar without being identical. Always check the individual plan’s policy before ordering.

Checking eligibility and benefit details before ordering is the most effective way to prevent a denied claim. Many commercial plans now require prior authorization for repeat vitamin D testing within six months, so verify each patient’s plan requirements individually.

Medicare reimbursement for CPT code 82306 and the 2026 fee schedule

CPT 82306 is reimbursed under the Medicare Physician Fee Schedule (MPFS) and the Clinical Laboratory Fee Schedule (CLFS). The rate depends on where the test is performed and which MAC jurisdiction the provider falls under. Use the CMS Physician Fee Schedule lookup tool to retrieve the exact 2026 rate for your locality.

Facility vs non-facility payment rates

Place of service affects reimbursement. A test billed from an independent laboratory reimburses differently than one billed from a hospital outpatient department. For CPT 82306, the 2026 Medicare national average sits at roughly $17-19 under the clinical laboratory fee schedule. Individual MAC jurisdictions vary around that figure.

At $17-19 a claim, the reconciliation work costs more than the underpayment it finds, so few teams do it by hand. Practice management software like Pabau captures the ERA and matches each payment against the submitted claim automatically. Small underpayments then surface on their own, which matters on a code a busy lab bills hundreds of times a month.

Billing guidelines for CPT code 82306

Vitamin D testing has straightforward coding rules, and coders still trip on the same handful of errors. The modifiers below are the ones that apply, and the mistakes after them are the ones that cost the most to unwind.

Applicable modifiers

Modifiers for CPT 82306 are limited but important to apply correctly.

• QW modifier: Used when CPT 82306 is performed in a CLIA-waived laboratory. Not all vitamin D testing platforms carry CLIA waiver status, so confirm before appending QW. Using QW on a non-waived test triggers a rejection.
• GZ modifier: Appended when a provider expects Medicare to deny the claim as not medically necessary. It applies where the patient has not signed an Advance Beneficiary Notice (ABN), and it signals that the provider is not collecting from the patient.
• GA modifier: Used when an ABN has been issued and signed. It allows the provider to bill the patient if Medicare denies the claim.
• 59 modifier: May be needed if multiple chemistry tests are ordered on the same date and a payer applies an unbundling edit. CPT 82306 is generally billed as a standalone test.

Common billing errors to avoid

These are the errors that most frequently cause CPT 82306 claims to reject or deny on first submission. Resolving them at the front end costs far less than working denials afterward.

• Wrong code for active vs storage form: Billing 82652 (1,25-dihydroxy) when 82306 (25-hydroxy) was ordered. The clinical context determines the correct code, not the test name on the lab report.
• Missing or mismatched ICD-10: Submitting 82306 without a qualifying ICD-10 code, or using a screening code such as Z00.00 instead of a disease code. Either one guarantees a medical necessity denial.
• Duplicate billing within a short interval: Most payers apply frequency edits. Ordering the same test within three months without documented clinical justification, such as treatment monitoring, typically denies.
• Billing fractions separately: The descriptor “includes fraction(s), if performed” means D2 and D3 fractions are bundled. Do not create separate line items for each fraction.

Building clean claims from the start reduces denial rates. Before submitting, confirm each CPT 82306 claim carries the correct procedure code and a supporting ICD-10 code. Then check the modifier, where one applies, and the place of service code. Capturing the diagnosis at the point of care removes most of the downstream rework.

How Pabau supports billing for CPT code 82306

Practices ordering vitamin D testing hit the same billing problems every month. Eligibility mismatches, missing ICD-10 codes and unreconciled remittances all land in the same aging report. Pabau is practice management software with claims tools for labs built in, covering the full claim lifecycle for codes like CPT 82306.

The workflow starts with CPT and ICD-10 code entry, then runs real-time eligibility verification before the test is ordered. Claims go out electronically through the Claim.MD clearinghouse, and ERA matching happens automatically when the payment arrives.

Claim.MD reaches more than 4,000 US payers and supports the CMS-1500 and 837P claim formats. Practices on Pabau submit vitamin D claims electronically, receive real-time eligibility responses, and process 835 remittance files without manual entry.

Tracking each 837 claim file through to ERA receipt shows billing teams where every claim stands, so nobody chases a payer for a status update.

Stop losing lab claims to medical necessity denials

Pabau validates CPT and ICD-10 pairings, checks eligibility in real time, and submits clean claims for lab tests including CPT 82306 through Claim.MD. Remittances match themselves against the claims you sent.

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Conclusion

CPT 82306 pays under $20 and takes as much administrative work as a claim worth ten times that. Every denial you rework erases the margin on several paid tests, which is what makes the front end worth the effort here.

So decide the diagnosis before the requisition goes out, not after the remittance arrives. Confirm the qualifying ICD-10 code sits in the chart, keep the fractions on one line, and append QW or GA only where they belong.

Do that consistently and vitamin D testing stops appearing in your denial reports at all. Book a demo to see how Pabau builds, submits, and reconciles lab claims like CPT 82306.

Continue your research

Need to understand how clearinghouse billing works? Medical claims clearinghouse guide explains how clearinghouses validate and route electronic claims to payers.

Want to reduce claim denials across your practice? Denial management in healthcare covers the systematic approach to tracking, appealing, and preventing insurance denials.

Billing across multiple lab codes? Revenue cycle management explained walks through the full financial workflow from patient registration to final payment posting.

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