HCPCS code J2510 – Injection, penicillin g procaine

Key takeaways

HCPCS Code J2510 is the Level II J-code for an injection of penicillin G procaine, aqueous, up to 600,000 units.

The 600,000-unit figure is a per-administration block, not a daily cap, so a larger dose is billed as multiple units.

The NDC from the vial used must appear on the claim for most payers, and omitting it is the most common denial trigger.

Medicare Part B generally covers J2510 where the setting is covered and the chart documents medical necessity.

Practice management software like Pabau captures the NDC, the dose in units, and the diagnosis at charge entry, before the claim goes out.

What is HCPCS Code J2510?

HCPCS Code J2510 is a Level II HCPCS J-code that describes Injection, penicillin G procaine, aqueous, up to 600,000 units. Maintained by the Centers for Medicare and Medicaid Services (CMS), it falls under the category “Drugs Administered Other Than Oral Method.” Physicians, hospitals, and outpatient facilities use it to bill for penicillin G procaine injections given in physician office, outpatient, and ambulatory settings.

The table below summarizes the key attributes of HCPCS Code J2510 at a glance.

Penicillin G procaine: clinical context

Penicillin G procaine is a long-acting, repository formulation of the antibiotic. The procaine salt slows absorption, producing sustained tissue levels over 12 to 24 hours after a single intramuscular injection. It treats bacterial infections susceptible to penicillin G, including certain cases of syphilis, pneumococcal pneumonia, and streptococcal infections.

The drug is given intramuscularly only, and intravenous administration is contraindicated. The 600,000-unit ceiling in the descriptor matches the standard single-dose range in most treatment protocols.

A dose above 600,000 units is billed as multiple units of J2510, each covering up to 600,000 units. The chart must show the total dose administered. Check current dosing against FDA labeling before billing more than one unit for a single encounter.

• Route: Intramuscular injection only
• Duration of action: Approximately 12-24 hours per single dose
• Common indications: Syphilis (certain stages), streptococcal infections, pneumococcal pneumonia
• Administration settings: Physician office, outpatient practice, ambulatory facility
• Unit cap per code: 600,000 units, with additional units of J2510 billed for larger doses

Medicare coverage and reimbursement for J2510

Medicare Part B generally covers penicillin G procaine injections when the drug is administered in a covered setting and medical necessity is documented. Coverage is subject to the Local Coverage Determinations (LCDs) and National Coverage Determinations (NCDs) for your jurisdiction. Check for an active LCD before you submit. Confirm current payment rates through the CMS Physician Fee Schedule lookup tool for the applicable benefit year, as rates update annually.

Practices running high volumes of injectable drug claims should check eligibility before the encounter rather than after a denial. Pabau’s claims management software captures the fields a J-code claim needs at charge entry. That keeps staff from reconstructing vial detail a week later.

ASC and facility status

HCPCS Code J2510 carries specific Ambulatory Surgery Center (ASC) payment indicators under the CMS Outpatient Prospective Payment System (OPPS). The ASC status indicator decides how the drug is paid in that setting. It is either separately payable or packaged into the facility payment for the primary procedure. Verify the current indicator in the CMS OPPS addendum for the relevant year before billing J2510 in an ASC context. In physician office settings, the drug is typically billed separately alongside the injection administration code.

NDC codes associated with J2510

Most commercial payers and Medicaid programs require a National Drug Code (NDC) on claims for injectable drugs billed under J-codes. The NDC links the specific manufacturer’s product to the HCPCS code for audit and tracking purposes. Omitting the NDC is the single most common reason J2510 claims are rejected on first submission.

NDC codes are 11-digit numbers in the 5-4-2 format, meaning labeler, then product, then package. For penicillin G procaine the number varies by manufacturer and package size.

Check it against the FDA NDC Directory for the specific vial or syringe used at the time of service. A manufacturer can retire a package configuration, so a number that worked last quarter is worth re-checking. The table below covers the format and the submission rules rather than any single product code.

Related HCPCS codes and crosswalks

Coders working with penicillin G procaine injections should be familiar with the adjacent J-codes covering other penicillin formulations and antibiotic injections. Choosing the wrong code, particularly confusing penicillin G procaine with penicillin G benzathine, is a frequent upcoding or incorrect-code error. The table below maps the most closely related HCPCS codes.

Watch the unit basis rather than the drug name. J2510 bills in blocks of 600,000 units, while J0558 and J0561 both bill in blocks of 100,000. A 600,000-unit dose is therefore one unit of J2510 but six units of J0561.

One more code still shows up in older cheat sheets. J0540, penicillin G benzathine up to 600,000 units, was terminated in 2010 and is no longer billable. Benzathine products now bill under J0561, or under J0558 for the benzathine and procaine combination.

Billing documentation requirements for J2510

Every J2510 claim needs documentation a payer or auditor can trace back to the clinical record. Weak documentation is the second-most-common denial cause after a missing NDC. The chart note must establish that the drug was ordered, that it was administered, and that the dose stayed within the unit threshold billed.

• Physician order or prescription: A signed order for penicillin G procaine specifying the dose in units
• Administration record: Date, time, route (intramuscular), injection site, and name or initials of the administering clinician
• Dose in units: Must match or be less than the units reported on the claim (up to 600,000 per unit of J2510 billed)
• Diagnosis code: A supporting ICD-10-CM code establishing medical necessity for the antibiotic injection
• NDC on claim: 11-digit NDC with qualifier N4 and units dispensed; required by most payers
• Lot number and expiration date: Some payers and state Medicaid programs require this in the medical record

Build J-code line items into your billing templates, with the NDC and unit fields set as required entries. That stops the two omissions payers reject most often. Practices that submit a clean claim the first time spend less of the month on rework and appeals.

Common billing errors and how to avoid them

J2510 claims fail for a predictable set of reasons. Each one is avoidable with the right documentation workflow.

Denial prevention starts before the claim goes out. When rejections do arrive, group them by code and read the remark text. The denial codes on a J2510 rejection tell you whether the cause was the NDC, the unit count, or medical necessity.

J2510 code status for 2025 and 2026

HCPCS Code J2510 is active and valid for both 2025 and 2026. CMS has not deleted or replaced this code in recent annual HCPCS updates. The code description remains unchanged: Injection, penicillin G procaine, aqueous, up to 600,000 units.

Confirm the current year’s Medicare payment rate against the CMS OPPS addenda or the fee schedule lookup before quoting reimbursement figures internally. Rates change annually and vary by geographic pricing locality. A billing system with an integrated code library refreshes those rates for you, which beats updating fee schedules by hand.

How Pabau keeps J2510 claim lines accurate

Most J2510 rejections start at charge entry. The NDC and the unit count get typed in by hand, often from a vial that has already gone in the sharps bin. Staff then rebuild the detail from memory or chase the clinician who gave the injection.

Pabau keeps the drug detail on the record that already holds the appointment and the administration note. The NDC, the dose in units, and the supporting diagnosis are captured once, at the point of care, and carried through to the claim line.

That changes the biller’s job. Rather than assembling a claim from three places, they review a line that is already populated. Rejections for a missing NDC or a mismatched unit count stop arriving, and the appeals queue shrinks with them.

Reduce claim denials on injectable drug billing

Pabau structures J-code claim lines from NDC capture through to unit reporting. Your penicillin G procaine claims go out clean the first time.

Book a demo

Conclusion

J2510 rewards a habit more than a lookup. The descriptor has not changed in years. The work is getting the vial’s NDC, the administered dose, and the supporting diagnosis onto the claim line. Do it while the patient is still in the room.

The trade-off worth remembering is the unit basis. A coder moving between J2510 and the benzathine codes switches between 600,000-unit and 100,000-unit blocks. That arithmetic is where the audit risk sits, not in the descriptor.

Build the check into charge entry and most of the appeals never need writing. Book a demo to see how Pabau captures NDC and unit detail on injectable drug claims before they leave your practice.

Continue your research

Want to understand how claim submission works end to end? Our medical billing guide walks through the full lifecycle from charge capture to payment posting.

Seeing recurring rejections on drug claims? Denial management in healthcare explains how to categorize, track, and resolve common J-code denial patterns.

Need to verify payer eligibility before administering the injection? Insurance eligibility verification covers the workflow for checking coverage before the encounter.

Frequently asked questions