Continuous Positive Airway Pressure (CPAP) Therapy For Obstructive Sleep Apnea (OSA) | CMS Coverage Update

Summary: The Centers for Medicare & Medicaid Services modified its CPAP therapy coverage policy for obstructive sleep apnea, effective May 15, 2026. Here's what billing teams need to do.

The Centers for Medicare & Medicaid Services updated its coverage policy for Continuous Positive Airway Pressure (CPAP) therapy for obstructive sleep apnea (OSA). This is one of the highest-volume durable medical equipment categories in Medicare billing — any shift in coverage criteria, trial period requirements, or medical necessity documentation standards directly affects reimbursement for thousands of DME suppliers and sleep medicine practices. The policy document does not list specific CPT or HCPCS codes in the data provided, so reference your current charge capture and cross-check against CMS's published HCPCS codes for CPAP equipment when reviewing this update.

Quick-Reference Table

CMS CPAP Coverage Criteria and Medical Necessity Requirements 2026

CMS CPAP coverage policy for OSA has always been documentation-heavy. The medical necessity bar is specific, and it hasn't gotten easier over the years.

Under longstanding CMS rules, CPAP therapy is covered for patients with a diagnosis of obstructive sleep apnea confirmed by a sleep test — either a polysomnography (PSG) conducted in a sleep lab or a home sleep apnea test (HSAT). The patient must meet defined apnea-hypopnea index (AHI) or respiratory disturbance index (RDI) thresholds for the diagnosis to support coverage. Medical necessity requires documented evidence that the patient has OSA, not just clinical suspicion.

The coverage policy also includes a trial period requirement. CMS covers CPAP initially as a 12-week trial. After that trial, continued coverage depends on the treating physician documenting that the patient is using the device and benefiting from it. If the documentation doesn't show adherence — typically defined as using the device at least four hours per night on 70% of nights during a consecutive 30-day period — coverage stops. This is where most claim denials happen.

Ordering physicians need to conduct a face-to-face evaluation before the trial begins. They also need to follow up in person after the trial to document clinical response and adherence. Without both pieces of documentation in the medical record, your DME supplier's claim is exposed.

Whether CPAP therapy is covered under Medicare depends on the type of sleep study used to establish the diagnosis. CMS recognizes both in-lab and home sleep testing, but each has its own documentation requirements. Make sure the sleep test meets CMS's technical standards and that the interpreting physician's report clearly states the AHI or RDI findings that justify the diagnosis.

Prior authorization is not universally required for CPAP under Medicare fee-for-service, but Medicare Advantage plans vary significantly. If your patients are on Medicare Advantage, check each plan's prior authorization requirements before initiating therapy. Don't assume fee-for-service rules apply.

CMS CPAP Therapy Exclusions and Non-Covered Indications

Not every patient with snoring or mild sleep-disordered breathing qualifies. CMS does not cover CPAP therapy for patients who don't meet the diagnostic threshold for OSA.

If the sleep study shows an AHI or RDI below the coverage threshold, CPAP is not a covered benefit — regardless of the physician's clinical judgment. Billing for CPAP in those cases will result in a claim denial, and an ABN (Advance Beneficiary Notice of Noncoverage) must be issued before providing the equipment if you have reason to believe Medicare won't cover it.

CPAP is also not covered as treatment for central sleep apnea (CSA) under standard CPAP coverage policy. CSA has its own coverage pathway. Don't bill standard CPAP HCPCS codes against a CSA diagnosis and expect coverage — you'll lose that claim.

Patients who complete the 12-week trial but fail to demonstrate adequate adherence lose ongoing coverage. Continued billing after a failed adherence trial, without a new qualifying evaluation, creates overpayment risk. If you're a DME supplier managing a large CPAP patient base, your billing guidelines should include a process for tracking adherence data before submitting ongoing rental claims.

Coverage Indications at a Glance

Because the policy data provided does not include a detailed indication-by-indication breakdown, the table below reflects established CMS CPAP coverage criteria. Confirm these against the May 15, 2026 version of the policy at app.payerpolicy.org/p/cms/226-v3.

CMS CPAP Therapy Billing Guidelines and Action Items 2026

The effective date of May 15, 2026 gives you a fixed deadline. Use it.

CPT, HCPCS, and ICD-10 Codes for CPAP Therapy Under This Policy

The policy data provided for this update does not include a specific list of CPT, HCPCS, or ICD-10 codes. Do not rely on this post alone to identify the complete code set.

Go directly to the CMS policy source at https://app.payerpolicy.org/p/cms/226-v3 to confirm the exact codes covered, the codes that require documentation, and any codes associated with non-covered indications.

In the meantime, CPAP billing under Medicare typically involves HCPCS codes for the device itself, replacement masks, tubing, filters, and heated humidifiers. ICD-10-CM diagnosis codes supporting medical necessity will be in the G47 range for sleep disorders. Confirm every code against the actual policy document — code-level coverage rules are the binding part of any CMS coverage policy, and you need the source document, not a summary, before updating your charge capture.