Aetna modified CPB 1008 on January 16, 2026, drawing a hard line between covered infectious disease tests and a growing list of experimental ones. Here's what billing teams need to do.
Aetna, a CVS Health company, updated its infectious disease testing coverage policy under CPB 1008 Aetna system. This update covers RT-QuIC prion disease testing (CPT 0035U and 0584U), syphilis screening tests (CPT 86592, 86593, 86780, 87285, 0064U, 0065U, and 0210U), and a broad sweep of metagenomic next-generation sequencing (mNGS), multiplex immunoassay, and other advanced diagnostic tests — most of which Aetna now explicitly calls experimental. If your lab or practice orders any of the 18 CPT codes flagged as not covered, denials are coming unless you adjust your workflows before claims go out.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | Aetna |
| Policy | Infectious Diseases: Selected Tests — CPB 1008 |
| Policy Code | CPB 1008 |
| Change Type | Modified |
| Effective Date | January 16, 2026 |
| Impact Level | High |
| Specialties Affected | Infectious disease, neurology, OB/GYN, clinical laboratory, hospital medicine, critical care |
| Key Action | Audit all mNGS, multiplex immunoassay, and sepsis biomarker test orders against the experimental list before billing Aetna |
Aetna Infectious Disease Testing Coverage Criteria and Medical Necessity Requirements 2026
This coverage policy covers two categories of tests that Aetna will pay for — with strict criteria attached to each.
RT-QuIC for Prion Disease
Aetna considers RT-QuIC testing medically necessary for one indication only: evaluating patients with rapidly progressive dementia where prion disease — such as Creutzfeldt-Jakob disease — is suspected. Bill this using CPT 0035U or CPT 0584U, depending on the assay version your lab uses. Both codes appear under "covered when selection criteria are met."
The ICD-10 codes supporting medical necessity here are A81.0 through A81.87 — the full Creutzfeldt-Jakob and prion disease range. If your documentation doesn't show rapidly progressive dementia with a clinical suspicion of prion disease, expect a claim denial. RT-QuIC has no coverage outside this narrow indication.
Syphilis Testing
The Aetna syphilis testing coverage policy covers non-treponemal tests (VDRL, RPR) and treponemal antibody detection tests for three groups: all pregnant women (screening), persons at risk for syphilis infection (screening), and individuals with signs and symptoms of syphilis (diagnostic). Covered codes include CPT 86592 (qualitative non-treponemal), 86593 (quantitative non-treponemal), 86780 (treponemal antibody), and 87285 (immunofluorescent Treponema pallidum detection). Proprietary panel codes 0064U, 0065U, and 0210U are also covered when these criteria are met.
This is standard syphilis billing — the criteria align with CDC screening guidelines. Document the qualifying indication clearly. A pregnant patient without documented screening intent, or a patient with no documented risk factors or symptoms, will not meet medical necessity under this policy.
There are no prior authorization requirements explicitly stated in CPB 1008 for these covered tests, but check your specific plan contracts. Some Aetna plan variants add prior auth layers that the CPB doesn't mention. If you're unsure whether prior authorization applies to a specific Aetna product your patient carries, call the plan before ordering.
Aetna Infectious Disease Testing Exclusions and Non-Covered Indications
This is where CPB 1008 gets expensive if your billing team isn't paying attention. Aetna has explicitly listed 20+ tests as experimental, investigational, or unproven. These get denied. No exceptions based on clinical need alone will overcome this designation.
Metagenomic Next-Generation Sequencing (mNGS)
Aetna's position: mNGS lacks sufficient peer-reviewed evidence for clinical coverage. The following tests are all excluded:
| # | Excluded Procedure |
|---|---|
| 1 | IDbyDNA AlloID, Respiratory Pathogen ID/AMR Panel (RPIP), and Urinary Pathogen ID/AMR Panel (UPIP) |
| 2 | Karius Test (mNGS of microbial cell-free DNA) — CPT 0152U |
| 3 | Johns Hopkins Metagenomic Next Generation Sequencing Assay and Mayo Clinic MSCSF Test for CNS infections — CPT 0323U and 0480U |
| 4 | MicroGenDX qPCR + NGS and shotgun metagenomics tests |
| 5 | NeXGen Fungal/AFB NGS Assay — CPT 0531U |
These are the most financially significant denials in this update. mNGS tests are expensive, and reimbursement on a denied claim is zero. If your infectious disease physicians or hospitalists order these routinely, they need to know this now.
Multiplex Immunoassay and Multianalyte Tests
Five specific tests fall here:
| # | Excluded Procedure |
|---|---|
| 1 | Accelerate PhenoTest BC Kit and its AST Configuration — CPT 0086U and 0311U |
| 2 | FebriDx Bacterial/Non-Bacterial Point-of-Care Assay — CPT 0442U |
| 3 | IntelliSep — CPT 0441U |
| 4 | MeMed BV — CPT 0351U |
Other Experimental Tests
This list includes several sepsis-related tests, a wound infection panel, and a periprosthetic joint infection panel. All are denied:
| # | Excluded Procedure |
|---|---|
| 1 | Bacterial typing by whole genome sequencing for outbreak workup — CPT 0010U |
| 2 | Monocyte distribution width (Early Sepsis Indicator) for sepsis diagnosis or management — CPT 0427U |
| 3 | Ciprofloxacin resistance (gyrA S91F) and macrolide/clarithromycin sensitivity (23S rRNA) testing |
| 4 | BIOTIA-ID Urine NGS Assay — CPT 0590U |
| 5 | FidaLab Molecular Wound Infection Test — CPT 0600U |
| 6 | IVD CAPSULE PSP Rapid Sepsis Test — CPT 0594U |
| 7 | LifeScale Gram Negative Kit (LSGN) — CPT 0610U |
| 8 | Synovasure Comprehensive PJI Test Panel — CPT 0601U |
| 9 | TriVerity for acute infection or sepsis detection — CPT 0588U |
| 10 | TrexAB for tetracycline resistance in Streptococcus dysgalactiae |
The sepsis biomarker tests — monocyte distribution width, IntelliSep, TriVerity, IVD CAPSULE PSP — represent a pattern. Aetna is not covering novel sepsis indicators, period. If your critical care or ED billing includes CPT 0427U for monocyte distribution width, those claims are denied under this policy.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| RT-QuIC for rapidly progressive dementia / suspected prion disease | Covered | 0035U, 0584U | Diagnosis must reflect suspected CJD or other prion disease; ICD-10 A81.x range |
| Syphilis screening — all pregnant women | Covered | 86592, 86593, 86780, 87285, 0064U, 0065U, 0210U | Non-treponemal and treponemal tests both covered |
| Syphilis screening — persons at risk | Covered | 86592, 86593, 86780, 87285, 0064U, 0065U, 0210U | Document risk factors in chart |
| Syphilis diagnostic testing — symptomatic patients | Covered | 86592, 86593, 86780, 87285, 0064U, 0065U, 0210U | Signs and symptoms must be documented |
| mNGS tests (IDbyDNA, Karius, MicroGenDX, NeXGen, CNS panels) | Experimental — Not Covered | 0152U, 0323U, 0480U, 0531U, 0112U | Insufficient peer-reviewed evidence per Aetna |
| Accelerate PhenoTest BC Kit / AST Configuration | Experimental — Not Covered | 0086U, 0311U | Effectiveness not established |
| FebriDx bacterial/non-bacterial assay | Experimental — Not Covered | 0442U | Not covered for any indication |
| IntelliSep | Experimental — Not Covered | 0441U | Not covered for sepsis management |
| MeMed BV | Experimental — Not Covered | 0351U | Not covered for any indication |
| Monocyte distribution width / Early Sepsis Indicator | Experimental — Not Covered | 0427U | Denied for sepsis diagnosis or management |
| Bacterial whole genome sequencing for outbreak workup | Experimental — Not Covered | 0010U | Not covered for any indication |
| Synovasure Comprehensive PJI Test Panel | Experimental — Not Covered | 0601U | Not covered for periprosthetic joint infection |
| FidaLab Molecular Wound Infection Test | Experimental — Not Covered | 0600U | Not covered for wound infection ID |
| IVD CAPSULE PSP Rapid Sepsis Test | Experimental — Not Covered | 0594U | Not covered for sepsis detection |
| LifeScale Gram Negative Kit | Experimental — Not Covered | 0610U | Not covered |
| TriVerity | Experimental — Not Covered | 0588U | Not covered for acute infection or sepsis |
| BIOTIA-ID Urine NGS Assay | Experimental — Not Covered | 0590U | Not covered for UTI pathogen identification |
| TrexAB (tetracycline resistance testing) | Experimental — Not Covered | None listed | Not covered |
Aetna Infectious Disease Testing Billing Guidelines and Action Items 2026
| # | Action Item |
|---|---|
| 1 | Pull every open order for codes 0152U, 0323U, 0480U, 0531U, 0112U, 0086U, 0311U, 0441U, 0442U, 0351U, 0427U, 0010U, 0590U, 0594U, 0600U, 0601U, 0610U, and 0588U before they go out as claims. If the payer on any of those orders is Aetna, flag them now. Every one of these codes is explicitly not covered under the updated CPB 1008. They will deny. |
| 2 | Update your charge capture to block or warn on denied codes for Aetna-insured patients. This is a workflow fix, not just a policy awareness issue. Your charge capture system should surface a warning when one of these codes hits an Aetna payer record. If you can't build that block, create a manual review queue. |
| 3 | Confirm documentation for RT-QuIC claims before billing CPT 0035U or 0584U. The chart must show rapidly progressive dementia with a clinical suspicion of prion disease. Map to the correct ICD-10 — A81.0 through A81.87 covers the full CJD and prion disease range. Anything outside this range won't support medical necessity. |
| 4 | Verify syphilis billing documentation for three distinct paths. Pregnant woman screening, at-risk population screening, and symptomatic diagnostic testing are all covered — but each requires different documentation. Don't bill CPT 86592 or 86780 on a claim without a documented indication. If the order just says "syphilis test," that's not enough. |
| 5 | Talk to your compliance officer if your practice has standing orders for any of the denied mNGS or sepsis panels. This isn't generic advice — if you have automatic order sets that include the Karius Test, MicroGenDX, or monocyte distribution width for Aetna patients, those order sets are generating denied claims as of January 16, 2026. Your compliance officer and medical director need to know before you've stacked up a denial backlog. |
| 6 | Don't attempt to appeal the experimental designations based on clinical merit alone. Aetna's "experimental, investigational, or unproven" designation requires a policy-level change to overcome — not a clinical letter. Direct physician appeal energy toward case-by-case exceptions only when the clinical facts genuinely don't match the denial reason. Most of these will not qualify. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Infectious Disease Tests Under CPB 1008
Covered CPT Codes (When Selection Criteria Are Met)
| Code | Type | Description |
|---|---|---|
| 0035U | CPT | Neurology (prion disease), cerebrospinal fluid, detection of prion protein by quaking-induced conformational conversion (RT-QuIC) |
| 0064U | CPT | Antibody, Treponema pallidum, total and rapid plasma reagin (RPR), immunoassay, qualitative |
| 0065U | CPT | Syphilis test, non-treponemal antibody, immunoassay, qualitative (RPR) |
| 0210U | CPT | Syphilis test, non-treponemal antibody, immunoassay, quantitative (RPR) |
| 0584U | CPT | Neurology (prion disease), cerebrospinal fluid, detection of prion protein by quaking-induced conformational conversion |
| 86592 | CPT | Syphilis test, non-treponemal antibody; qualitative (e.g., VDRL, RPR, ART) |
| 86593 | CPT | Syphilis test, non-treponemal antibody; quantitative |
| 86780 | CPT | Antibody; Treponema pallidum |
| 87285 | CPT | Infectious agent antigen detection by immunofluorescent technique; Treponema pallidum |
Not Covered / Experimental CPT Codes
| Code | Type | Description | Reason |
|---|---|---|---|
| 0010U | CPT | Infectious disease (bacterial), strain typing by whole genome sequencing, phylogenetic-based report | Experimental — bacterial whole genome sequencing for outbreak workup |
| 0086U | CPT | Infectious disease (bacterial and fungal), organism identification, blood culture, using rRNA FISH | Experimental — Accelerate PhenoTest BC Kit |
| 0112U | CPT | Infectious agent detection and identification, targeted sequence analysis (16S and 18S rRNA genes) | Experimental — mNGS |
| 0152U | CPT | Infectious disease (bacteria, fungi, parasites, and DNA viruses), microbial cell-free DNA, plasma | Experimental — Karius Test (mNGS of microbial cell-free DNA) |
| 0311U | CPT | Infectious disease (bacterial), quantitative antimicrobial susceptibility reported as phenotypic minimum | Experimental — Accelerate PhenoTest BC Kit AST Configuration |
| 0323U | CPT | Infectious agent detection by nucleic acid (DNA and RNA), central nervous system pathogen, metagenomic sequencing | Experimental — CNS mNGS (Johns Hopkins, Mayo MSCSF) |
| 0351U | CPT | Infectious disease (bacterial or viral), biochemical assays, tumor necrosis factor-related apoptosis | Experimental — MeMed BV |
| 0427U | CPT | Monocyte distribution width, whole blood (list separately in addition to code for primary procedure) | Experimental — Early Sepsis Indicator |
| 0441U | CPT | Infectious disease (bacterial, fungal, or viral infection), semiquantitative biomechanical assessment | Experimental — IntelliSep |
| 0442U | CPT | Infectious disease (respiratory infection), Myxovirus resistance protein A (MxA) and C-reactive protein | Experimental — FebriDx |
| 0480U | CPT | Infectious disease (bacteria, viruses, fungi, and parasites), cerebrospinal fluid (CSF), metagenomic sequencing | Experimental — mNGS CNS infections |
| 0531U | CPT | Infectious disease (acid-fast bacteria and invasive fungi), DNA (673 organisms), next-generation sequencing | Experimental — NeXGen Fungal/AFB NGS assay |
| 0588U | CPT | Infectious disease (bacterial or viral), 32 genes (29 informative and 3 housekeeping), immune response | Experimental — TriVerity |
| 0590U | CPT | Infectious disease (bacterial and fungal), DNA of 44 organisms (34 bacteria, 10 fungi), urine, next-generation sequencing | Experimental — BIOTIA-ID Urine NGS Assay |
| 0594U | CPT | Infectious disease (sepsis), semiquantitative measurement of pancreatic stone protein concentration | Experimental — IVD CAPSULE PSP Rapid Sepsis Test |
| 0600U | CPT | Infectious disease (wound infection), identification of 65 organisms and 30 antibiotic resistance genes | Experimental — FidaLab Molecular Wound Infection Test |
| 0601U | CPT | Infectious disease (periprosthetic joint infection), analysis of 11 biomarkers (alpha defensins 1–3) | Experimental — Synovasure Comprehensive PJI Test Panel |
| 0610U | CPT | Infectious disease (antimicrobial susceptibility), phenotypic antimicrobial susceptibility testing | Experimental — LifeScale Gram Negative Kit |
Key ICD-10-CM Diagnosis Codes
| Code | Description |
|---|---|
| A40.0–A40.9 | Streptococcal sepsis (range) |
| A41.1–A41.9 | Other sepsis (range) |
| A51.31–A51.39 | Secondary syphilis of skin and mucous membranes |
| A51.41–A51.49 | Other secondary syphilis |
| A81.0–A81.8 | Creutzfeldt-Jakob disease |
| A81.81–A81.87 | Other atypical virus infections of central nervous system (prion disease) |
Note: The sepsis ICD-10 codes (A40.x, A41.x) appear in the policy's code list but map only to tests Aetna considers experimental. Billing these diagnosis codes with covered CPT codes will not establish coverage for the experimental tests.
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