Influenza Rapid Diagnostic Tests — CPB 0476 | AETNA Coverage Update

TL;DR: Aetna, a CVS Health company, modified CPB 0476 for rapid influenza diagnostic tests, effective September 26, 2025. If your team bills CPT 87804, here's what the updated coverage policy means for your claims.

Aetna's influenza rapid diagnostic test coverage policy under CPB 0476 in the Aetna system confirms CPT 87804 as covered when medical necessity criteria are met. The policy explicitly names several test brands — Directigen Flu A, Directigen Flu A+B, Flu OIA, Quickvue Influenza Test, and Z Stat Flu — and backs them with a broad ICD-10 code set covering 33 diagnosis codes. For billing teams running high flu-season volume, this update is worth locking in before claims start stacking up.

Quick-Reference Table

Aetna Influenza Rapid Diagnostic Test Coverage Criteria and Medical Necessity Requirements 2025

Aetna's coverage policy under CPB 0476 is straightforward: rapid diagnostic tests for viral influenza meet medical necessity criteria and are covered. The policy names specific branded tests — Directigen Flu A, Directigen Flu A+B, Flu OIA, Quickvue Influenza Test, and Z Stat Flu — as examples of covered tests. All of these bill under CPT 87804, which covers infectious agent antigen detection by immunoassay with direct optical observation for influenza.

The phrase "selection criteria are met" in the code grouping matters. Aetna doesn't just cover CPT 87804 unconditionally — it covers it when the test is medically necessary. That means you need appropriate diagnosis coding to support the claim.

The covered ICD-10 set is broad. It includes confirmed influenza codes (J10.00–J11.89), plus symptom codes like R50.9 (fever, unspecified), R05.x (cough), R06.02 (shortness of breath), R51.x (headache), M79.1x (myalgia), R53.81 (other malaise), and B34.9 (viral infection, unspecified). That symptom-code coverage is useful — it means you can bill CPT 87804 when a patient presents with classic flu symptoms before a diagnosis is confirmed.

The CPB 0476 Aetna policy does not mention prior authorization requirements for CPT 87804. That's consistent with how most point-of-care tests work under commercial coverage policies. But prior auth requirements can vary by plan, so confirm at the plan level for any patients where you're unsure.

No reimbursement rates are specified in the policy document itself. Check Aetna's fee schedule or your contracted rate schedule for CPT 87804 reimbursement in your market.

Coverage Indications at a Glance

Aetna Influenza Rapid Diagnostic Test Billing Guidelines and Action Items 2025

This policy modification took effect September 26, 2025 — meaning flu-season claims submitted after that date should align with the updated CPB 0476 criteria. Here's what your team needs to do now.

1. Lock in CPT 87804 on your charge capture before flu season volume spikes.
This is the only CPT code covered under CPB 0476 for influenza rapid diagnostic tests in the Aetna system. Every rapid flu test — regardless of brand — routes through CPT 87804. Make sure your EHR order sets and charge capture tools map to this code, not a legacy or unlisted code.

2. Review your ICD-10 pairing logic against all 33 covered codes.
The M79.1x myalgia codes break out by anatomical site (M79.10 through M79.18). The R05.x cough codes and R51.x headache codes have multiple subcategories. Don't default to unspecified codes when your documentation supports a more specific one. Unspecified codes on a claim are a flag — and a flag is a delay.

3. Do not rely on B34.9 (viral infection, unspecified) as your primary diagnosis code.
It's in the covered set, but it's the weakest code in the list. If the documentation supports a more specific code — even a symptom code like R50.9 or R06.02 — use it. B34.9 as a standalone DX on a CPT 87804 claim is the kind of thing that triggers a claim denial or a medical necessity review.

4. Confirm prior authorization requirements at the plan level.
The CPB 0476 policy doesn't require prior auth for CPT 87804. But Aetna plan designs vary. Some Aetna commercial plans, Medicaid products, and Medicare Advantage plans may have different rules. Check eligibility and plan benefits before assuming the policy-level coverage applies to every Aetna card you see.

5. Train front desk and clinical staff on the symptom code set.
Your providers don't need to confirm influenza to bill CPT 87804. A patient presenting with fever, myalgia, cough, and shortness of breath gives you documented medical necessity using the symptom codes in the covered set. Make sure your documentation workflow captures the specific symptom — not just "flu-like illness" — so coders have what they need to assign the right ICD-10.

6. Audit recent CPT 87804 denials for ICD-10 mismatches.
If you've had CPT 87804 denials from Aetna in the past 90 days, pull them now and check the diagnosis codes. A common pattern is submitting with a diagnosis outside the covered set — or using a non-specific code when a specific one was available. The September 26, 2025 effective date is a good natural audit trigger.

CPT, HCPCS, and ICD-10 Codes for Influenza Rapid Diagnostic Tests Under CPB 0476

Covered CPT Codes (When Selection Criteria Are Met)

Key ICD-10-CM Diagnosis Codes

A quick note on the R51.x codes: the headache subcategories listed here are specific — R51.0 through R51.9 cover distinct headache presentations. Most flu-related headaches will code to R51.9 (headache, unspecified) unless documentation supports a more specific subtype. Don't guess up the specificity. Code to what's documented.

The same logic applies to the R05.x cough codes. R05.9 (cough, unspecified) is fine if the documentation doesn't characterize the cough further. But if the provider notes an acute cough, R05.1 is the better code — and it's cleaner on audit.

The breadth of this ICD-10 set reflects a sensible clinical reality: you're often testing because the diagnosis isn't confirmed yet. Aetna's coverage policy acknowledges this by including symptom codes alongside confirmed influenza codes. That's actually a billing-friendly design. Use it.