CPT code 95024 – Intradermal allergy testing

Key takeaways

CPT code 95024 covers intradermal allergy tests with allergenic extracts for immediate-type reactions, distinct from percutaneous testing under 95004.

Units are counted per individual intradermal test administered, not per encounter or allergen set.

Modifier 25 goes on the evaluation and management (E&M) code, not on 95024. Modifier 59 may be needed when 95024 and 95004 share a date of service.

Medicare generally requires direct physician supervision, so name the supervising physician in every 95024 note.

Practice management software like Pabau links procedure codes to patient records, supporting clean claim submission for allergy testing.

What CPT code 95024 covers

CPT code 95024 is defined by the American Medical Association (AMA). It covers “intracutaneous (intradermal) tests with allergenic extracts, immediate type reaction, including test interpretation and report, specify number of tests.”

The key phrase is “immediate type reaction.” The reading happens 15 to 20 minutes after injection. A reading at 48 to 72 hours points to delayed hypersensitivity testing, which bills under different codes.

The procedure itself involves injecting a small volume of allergenic extract into the dermis, typically on the forearm or upper back. The clinician then observes and measures the wheal-and-flare response at the injection site. Each allergen tested generates a separate billable unit under 95024.

95024 vs 95004: Intradermal vs percutaneous testing

CPT 95004 covers percutaneous allergy tests, meaning scratch, prick, or puncture methods. CPT code 95024 covers intradermal injection tests. The two codes aren’t interchangeable, and billing the wrong one for the method used can trigger a payer audit.

Same-day billing of both 95004 and 95024 is possible when the patient genuinely needs both test methods. National Correct Coding Initiative (NCCI) edits bundle them by default, though.

Payers expect modifier 59 on the secondary code and documentation confirming why both were medically necessary on the same date. Without that, expect a denial or a request for medical records.

Related allergy testing and immunotherapy CPT codes

CPT code 95024 sits within the broader allergy testing and immunotherapy code family. Coders working in allergy and otolaryngology practices need to distinguish adjacent codes to avoid misreporting. Two facts from the note settle most testing claims: how the extract was applied, and when the reaction was read.

Before coding a multi-test session, verify the adjacent allergy codes in the AAPC Codify CPT lookup. The ones worth checking are 95017, 95018, 95052, 95056, 95060, 95065, 95070, 95120, 95125, 95130-95134, 95144, 95165 and 95180.

Documentation requirements for CPT code 95024

Every 95024 claim needs a medical record that can withstand a payer audit. Incomplete documentation is the most common root cause of denials, and it’s hard to fix once the claim has gone out.

The medical record must include all of the following for each 95024 unit billed:

• Name and concentration of each allergenic extract injected
• Anatomical site of each intradermal injection
• Number of individual tests performed (this equals the unit count billed)
• Wheal and flare measurements at the reading time (typically 15-20 minutes post-injection)
• Physician or qualified non-physician practitioner (NPP) interpretation and written report
• Supervising physician’s name and credentials
• Diagnosis or clinical indication supporting medical necessity

Physician supervision and incident-to requirements

Under Medicare, allergy skin testing, including CPT code 95024, generally requires direct supervision. A physician must be in the office suite and immediately available while the test is given, though not necessarily in the room. A nurse or medical assistant may perform the injection under that supervision.

For Medicare billing, the physician can’t be off-site during the procedure. Verify the current supervision indicator for 95024 against the CMS Physician Fee Schedule lookup tool, as supervision categories are updated annually.

Incident-to billing under Medicare applies only when the service is:

• Performed in a physician-led practice
• Given under direct supervision
• An integral part of the physician’s treatment plan for the patient

The physician must see new patients, and existing patients with new problems, before incident-to rules apply.

How billing units work for 95024

CPT code 95024 is billed per individual intradermal test administered, not per encounter and not per allergen panel. A session in which 12 separate intradermal injections are given bills as 12 units of 95024. That said, payer-specific unit caps apply and vary significantly.

Same-day bilateral testing does not automatically double the allowable unit count unless payer policy specifically permits it. Document the clinical rationale for bilateral testing in the record before billing additional units.

Modifiers that apply to intradermal testing

Modifier selection for 95024 is usually simple. Denials follow when a practice applies modifiers inconsistently, or leaves off one that’s required.

Modifier 25 belongs on the E&M code, not on 95024. It’s the most repeated modifier error in allergy practices, and payer systems catch it by matching modifier placement to code type. The FastRVU 2026 RVU lookup shows whether a modifier changes the reimbursable relative value unit (RVU).

ICD-10 codes that support medical necessity

Every 95024 claim must carry a diagnosis code that supports medical necessity for allergy testing. Payers cross-reference the ICD-10-CM code against the code’s LCD or coverage policy. An unspecified code, submitted when the record supports a specific one, can trigger a medical necessity denial.

Code to the highest specificity the clinical record supports. LCD L36402 lists the covered diagnoses for allergy testing under Medicare. A code outside that list is denied automatically, however appropriate the test was.

Medicare and payer coverage

Medicare covers CPT code 95024 under Local Coverage Determination (LCD) L36402, which governs allergy testing billing guidelines for Medicare patients. Coverage has three conditions:

• The testing is medically necessary
• The ordering provider has documented a clinical basis for allergy evaluation
• The reported diagnosis codes match the LCD’s covered indication list

For 2026 reimbursement rates, check the same CMS Physician Fee Schedule lookup using code 95024 and your practice’s geographic locality modifier. Rates vary by location and may differ between facility and non-facility settings.

Prior authorization requirements for allergy testing

Traditional Medicare typically doesn’t require prior authorization for CPT code 95024, but other payers set their own rules. Medicare Advantage plans frequently impose prior auth requirements that differ from traditional Medicare, and Medicaid programs vary by state. Run insurance eligibility verification at scheduling rather than at check-in, so prior authorization requirements surface before the test.

• Commercial plans: Prior auth requirements are plan-specific. Check the payer’s portal or call the provider line before scheduling extended allergy panels.
• Medicare Advantage: Plans may require auth even for codes traditional Medicare covers without restriction. The plan’s coverage policy governs, not the traditional Medicare LCD.
• Medicaid: State programs vary. Some require prior auth for intradermal testing above a set unit count; others do not.
• Documentation for auth submission: Typically requires referring physician notes, ICD-10 codes, number of tests planned, and prior treatment history.

Common denial reasons and how to prevent them

Most 95024 denials fall into six predictable categories, and each one can be caught before the claim goes out. The table maps each denial to its root cause and the check that prevents it.

Check your practice’s denials against the list of medical billing denial codes every month to catch patterns early. A single root cause, such as missing supervisor documentation, can generate dozens of denials across a billing period before anyone notices.

How Pabau supports allergy testing billing and documentation

Billing 95024 means tracking each allergen, counting units, naming the supervising physician and coding the diagnosis to full specificity. When the test log, the note and the billing system sit apart, a coder re-keys each unit by hand.

Practice management software like Pabau keeps those details in one record. Its claims management software connects treatment notes to procedure codes, so the information that supports medical necessity is captured before billing begins.

Claim.MD, Pabau’s US clearinghouse partner, handles CMS-1500 and 837P submissions across 4,000+ payers. For an allergy practice, that means:

• Real-time eligibility responses that surface unit limits and prior auth rules before the patient arrives
• Claim validation against payer edits before transmission
• Electronic remittance matching after payment

Practices can also generate a superbill directly from the encounter. It carries the procedure codes, units, and diagnosis codes into the billing queue without manual re-entry.

Allergy practice billing starts with clean records

Pabau links procedure codes to patient records and routes claims through Claim.MD so your allergy testing documentation supports every unit billed. See how it works in a live demo.

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Conclusion

Treat 95024 as a documentation code first and a billing code second. When the note records each extract, its site, its wheal measurement and the supervising physician, the unit count holds up in an audit.

The trade-off is time at the front desk. Checking eligibility at scheduling adds a step, but it costs far less than appealing a session that has already happened.

Book a demo to see how Pabau carries each 95024 unit from the treatment note to a clean claim.

Continue your research

Need a framework for managing claims after they go out? Denial management in healthcare covers the full cycle from tracking to appeal workflows.

Unsure how your billing compliance holds up? Medical billing compliance practices outlines what payers audit and how to document defensively.

Want to understand how the clearinghouse connection works? Our Claim.MD clearinghouse guide explains payer enrollment, eligibility, and 835 remittance processing.

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