Otolaryngology Coding Alert

Let these 3 scenarios help you achieve clarity in coding this tricky service combo.

For patients with conditions like chronic rhinitis, rashes, and other adverse reactions to environmental elements, allergy testing is the gateway to clarity. However, from a coding perspective, the rules around being able to report percutaneous or intradermal allergy testing along with a separate, significant evaluation and management (E/M) service can be pretty muddy.

So we examined two different scenarios to understand when you can bill allergy testing and E/M services together, along with a third scenario in which the allergy testing cannot be billed with an E/M service.

Here’s how we broke it all down.

Begin by Understanding the Allergy Codes

Allergic and hypersensitivity disorders can show up anywhere on the body — from systemic reactions to localized flare-ups. A provider will begin by assessing whether there is an allergic basis for the patient’s symptoms based upon the patient’s history, exam, and the provider’s clinical judgement. If the provider determines allergies are the basis of the patient’s symptoms, the provider will most likely go ahead and one of the following tests:

• 95004 (Percutaneous tests (scratch, puncture, prick) with allergenic extracts, immediate type reaction, including test interpretation and report, specify number of tests)
• 95024 (Intracutaneous (intradermal) tests with allergenic extracts, immediate type reaction, including test interpretation and report, specify number of tests)
• 95027 (Intracutaneous (intradermal) tests, sequential and incremental, with allergenic extracts for airborne allergens, immediate type reaction, including test interpretation and report, specify number of tests)

CPT^® guidelines for allergy testing note that that physician work (performance, interpretation, and preparation of a report) is included in these codes.

This means:

• You cannot bill an E/M service solely for reviewing test results or preparing the allergy report
• You can bill an E/M service with modifier 25 (Significant, separately identifiable evaluation and management service by the same physician or other qualified health care professional on the same day of the procedure or other service) when — and only when — the provider performs a significant, separately identifiable E/M service on the same day

So, when is the E/M service truly billable? When the provider:

• Performs a full history and exam unrelated to the testing itself

• Makes medical decisions beyond interpreting the test

• Provides counseling or care coordination not inherent to the testing codes
• Documents all of the above

In these cases, modifier 25 is essential to show that the E/M service stands apart from the testing. This protects against “double-dipping” when coding the physician’s work yet still allows appropriate reimbursement when the separate encounter occurs with the testing.

Here’s how these rules play out in three typical encounters.

Scenario 1: New Problem Evaluated on the Same Day as Testing

A patient arrives for scheduled percutaneous allergy testing (95004) for suspected environmental allergies. Before testing begins, the patient reports new onset shortness of breath and chest tightness that started the night before.

The provider:

• Performs a problem‑focused history and exam specific to the new respiratory complaint
• Performs medical decision making (MDM) to rule out acute asthma exacerbation
• Orders a nebulizer treatment and prescribes an inhaler
• Documents that the respiratory issue is unrelated to the allergy testing

After stabilizing the patient, the provider proceeds with the planned allergy testing.

Analysis: In this situation, the E/M is separately billable because the provider addressed a new, unrelated issue. The E/M is allowed because it addressed a new, acute problem requiring evaluation and treatment. This work is not inherent to performing allergy testing.

Coding:

• 99213 (Office or other outpatient visit for the evaluation and management of an established patient, which requires a… low level of medical decision making….) with modifier 25 appended for the E/M evaluating new respiratory symptoms
• 95004 x (number of tests) for the allergy testing

Scenario 2: Comprehensive Evaluation for Chronic Symptoms With Same‑Day Testing

A patient presents with months of chronic urticaria, worsening over the last two weeks. The provider:

• Performs a detailed history exploring triggers, medication use, diet, and environmental exposures
• Performs a targeted physical exam
• Performs MDM that includes differential diagnoses (autoimmune, medication‑induced, idiopathic, allergic)
• Orders laboratory testing
• Provides treatment counseling and starts a step‑wise antihistamine regimen

Based on the clinical picture, the provider decides to perform intradermal testing (95024) during the same visit.

Analysis: In this scenario, the E/M is separately billable because the provider performed a full diagnostic E/M service that goes well beyond the inherent work of allergy testing. In other words, the testing was only one component of the broader clinical encounter.

Coding:

• 99214 (Office or other outpatient visit for the evaluation and management of an established patient, which requires a… moderate level of medical decision making….)  with modifier 25 appended for the E/M evaluating a chronic condition, providing a differential diagnosis, and providing treatment planning
• 95024 x (number of tests) for the intradermal allergy testing

Scenario 3: Scheduled Testing Following Referral

Here is an example for when an E/M service is NOT separately billable:

A patient arrives for scheduled percutaneous and intradermal allergy testing after being referred by their primary care provider. During the visit, the provider

• Reviews the previously documented history from the referral
• Confirms no changes in symptoms, medications, or health status
• Performs the allergy testing (95004 and 95024)
• Interprets the immediate wheal‑and‑flare reactions
• Documents the testing report
• Advises the patient that full results and next steps will be discussed at a future follow‑up visit

Analysis: Everything the provider did — reviewing for contraindications, performing the test, interpreting the reactions, and preparing the report — is already included in the allergy testing codes. As the provider has not evaluated any new problems, not engaged in any additional MDM, and not performed a separate history, exam, or counseling beyond what is required to safely conduct the testing, you cannot bill for the E/M service.

In other words, there was no significant, separately identifiable E/M service beyond the inherent work of 95004/95024.

Coding:

• 95004 x (number of tests)
• 95024 x (number of tests).

Cristin Robinson, CPC, CPMA, CCC, CRC, CEMC, AAPC Approved Instructor,
Education Coding Consultant, Bristol, Tennessee