Acoustic Pharyngometers and SNAP™ Testing System — CPB 0336 | AETNA Coverage Update

Aetna modified CPB 0336 to recognize SNAP Testing (3+ channels) as medically necessary for home OSA diagnosis in adults, effective September 26, 2025. Here's what changes for billing teams.

Aetna, a CVS Health company, updated its coverage policy under CPB 0336 for acoustic pharyngometers and the SNAP™ Testing System. The change grants covered status to SNAP Testing using three or more channels for home sleep testing, billed under HCPCS code G0400. This is a meaningful shift — it moves a testing technology from ambiguous territory into clearly covered ground, provided your patient and documentation meet the criteria in Aetna's companion policy CPB 0004 for obstructive sleep apnea in adults.

---

Quick-Reference Table

Field	Detail Copy
Payer	Aetna, a CVS Health company
Policy	Acoustic Pharyngometers and SNAP™ Testing System
Policy Code	CPB 0336
Change Type	Modified
Effective Date	September 26, 2025
Impact Level	Medium
Specialties Affected	Sleep medicine, pulmonology, ENT, primary care (OSA workup)
Key Action	Confirm G0400 claims for SNAP Testing meet CPB 0004 criteria before billing

---

Aetna SNAP Testing Coverage Criteria and Medical Necessity Requirements 2025

CPB 0336 Aetna now explicitly covers SNAP Testing with three or more channels as a home sleep test (HST) device for diagnosing obstructive sleep apnea in adults. That's the core of this update. Before September 26, 2025, this technology sat in a gray zone — now it has a clear covered designation, with conditions.

The medical necessity bar here is set by CPB 0004, not CPB 0336 itself. CPB 0336 tells you what device is covered. CPB 0004 tells you who qualifies for home sleep testing. Your team needs both policies open when reviewing these claims.

For HCPCS G0400 — "Home sleep test (HST) with type IV portable monitor, unattended; minimum of 3 channels" — coverage applies when the adult patient meets Aetna's OSA medical necessity criteria under CPB 0004. That typically means documented signs and symptoms of OSA, a clinical evaluation supporting the need for testing, and no contraindications to unattended home testing (such as significant cardiorespiratory disease that warrants in-lab polysomnography).

The three-channel minimum is non-negotiable in this coverage policy. SNAP Testing with fewer than three channels does not qualify. Check your device configuration documentation before submitting.

Prior authorization requirements for home sleep testing under Aetna vary by plan. Don't assume unattended HST bypasses prior auth just because the technology is now covered. Confirm prior authorization requirements with the specific plan before scheduling the test. A claim denial for missing prior auth on a newly covered service is an avoidable write-off.

Reimbursement for G0400 flows through Aetna's standard HST fee schedule. The coverage policy change doesn't alter the fee schedule — it changes eligibility. Your reimbursement is only as good as your documentation of medical necessity.

---

Aetna SNAP Testing Exclusions and Non-Covered Indications

The policy is specific about what qualifies: SNAP Testing with three or more channels, for adult patients, for home OSA diagnosis. Everything outside that scope is not covered under CPB 0336.

Acoustic pharyngometry — the other technology referenced in the policy title — remains non-covered under this policy. The modification addresses only SNAP Testing. Don't bill G0400 for acoustic pharyngometry and expect it to pass under this update.

Pediatric patients are excluded from the SNAP Testing coverage designation in CPB 0336. The policy is limited to adults. The ICD-10 codes in the P28 range (neonatal/newborn apnea) appear in the broader code set but are not the basis for coverage under this specific device provision.

---

Coverage Indications at a Glance

---

Aetna SNAP Testing Billing Guidelines and Action Items 2025

Copy Action Items

---

CPT, HCPCS, and ICD-10 Codes for SNAP Testing Under CPB 0336

Covered HCPCS Codes (When Selection Criteria Are Met)

Code	Type	Description Copy
G0400	HCPCS	Home sleep test (HST) with type IV portable monitor, unattended; minimum of 3 channels

Key ICD-10-CM Diagnosis Codes

These are the diagnosis codes associated with CPB 0336. OSA-specific codes (G47.31–G47.39) are your primary supporting diagnoses for G0400 billing. The broader sleep disorder and breathing abnormality codes appear in the policy's covered code set but serve as secondary support.

Organic Sleep Apnea (Primary OSA Codes)

Broader Sleep Disorders

Sleep Disorders Not Due to Substance or Known Physiological Condition

Apnea of Newborn (P28 Range — Note: CPB 0336 adult coverage only)

Abnormalities of Breathing

---

The P28 and R06 codes are listed in Aetna's covered code set for this policy, but they don't independently support G0400 billing for SNAP Testing. The covered device designation in CPB 0336 is adult OSA diagnosis. Use OSA-specific diagnosis codes from the G47.3x range as your primary ICD-10 codes on G0400 claims.

---