Aetna CPB 1008 Update: What Billing Teams Need to Know About Infectious Disease Test Coverage in 2026

Aetna, a CVS Health company, has modified Clinical Policy Bulletin CPB 1008—Infectious Diseases: Selected Tests—with an effective date of March 13, 2026. This update clarifies which infectious disease diagnostic tests Aetna considers medically necessary versus experimental, drawing sharp coverage lines across metagenomic next-generation sequencing (mNGS), multiplex immunoassay panels, prion disease diagnostics, and syphilis testing. If your practice or health system orders any of these tests for Aetna members, this policy directly affects your reimbursement.

Field	Detail
Payer	Aetna (CVS Health)
Policy	Infectious Diseases: Selected Tests
Policy Code	CPB 1008
Change Type	Modified
Effective Date	2026-03-13
Impact Level	High
Specialties Affected	Infectious Disease, Neurology, OB/GYN, Laboratory Medicine, Internal Medicine, Emergency Medicine, Orthopedic Surgery
Key Action	Audit your infectious disease test orders against Aetna's covered vs. experimental designations and update claim workflows for RT-QuIC and syphilis testing codes before March 13, 2026.

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What Aetna CPB 1008 Covers: Medical Necessity Criteria for Infectious Disease Tests

The updated policy establishes medical necessity for two categories of infectious disease testing. Understanding the specific criteria is essential—submitting claims outside these criteria will result in denials.

RT-QuIC Testing for Prion Disease

Aetna considers real-time quaking-induced conversion (RT-QuIC) medically necessary when evaluating patients with rapidly progressive dementia suspected of having prion disease, including Creutzfeldt-Jakob disease (CJD). The clinical trigger is clear: rapidly progressive dementia plus clinical suspicion of a prion etiology. Documentation should reflect both the symptom progression and the differential diagnosis workup supporting prion disease as a suspected cause.

Syphilis Testing

Aetna covers syphilis testing—using non-treponemal tests (VDRL, RPR) and/or treponemal antibody detection—in three distinct populations:

#	Covered Indication Copy
1	All pregnant women (screening)
2	Persons at risk of syphilis infection (screening)
3	Individuals with signs and symptoms of syphilis (diagnostic)

This dual-pathway approach—non-treponemal and treponemal—mirrors CDC guidance and supports both traditional and reverse-sequence testing algorithms. Make sure your documentation clearly supports the indication, whether it's prenatal screening or symptomatic diagnosis.

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Aetna's Experimental and Investigational Designations: mNGS, Multiplex Panels, and Other Tests

This is where CPB 1008 carries the most billing risk. Aetna has explicitly classified three broad categories of testing as experimental, investigational, or unproven—meaning these will not be covered for Aetna members regardless of the diagnosis code submitted.

Metagenomic Next-Generation Sequencing (mNGS)

The following mNGS platforms are non-covered under this policy:

Aetna's rationale for all of these is the same: insufficient evidence in peer-reviewed literature. If your infectious disease or neurology team routinely orders mNGS panels for complex or undifferentiated infections, assume these will be denied for Aetna members without an approved prior authorization or successful appeal process.

Multiplex Immunoassay and Multianalyte Tests

Five specific multiplex platforms are non-covered because their effectiveness has not been established:

These tests are frequently ordered in sepsis workups and ICU settings. Alert your critical care and hospital medicine teams—these panels will not clear Aetna's medical necessity threshold.

Other Non-Covered Tests

Aetna has also flagged 10 additional tests as experimental or unproven:

The Synovasure Comprehensive PJI Test Panel designation is particularly relevant for orthopedic surgery and joint reconstruction programs—periprosthetic joint infection (PJI) workups using this panel will not be reimbursed under Aetna.

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Affected Codes

Covered Codes (Selection Criteria Must Be Met)

Not Covered / Experimental Codes

Key ICD-10-CM Diagnosis Codes

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What Your Billing Team Should Do

Copy Action Items

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