CMS modified NCD 226 for CPAP therapy covering obstructive sleep apnea, effective March 7, 2026. Here's what billing teams need to know before submitting claims.
The Centers for Medicare & Medicaid Services updated NCD 226 Medicare coverage policy for continuous positive airway pressure therapy. This is a durable medical equipment benefit under Medicare. No specific CPT or HCPCS codes are listed in this policy update, but the coverage criteria, medical necessity standards, and documentation requirements all carry direct consequences for your CPAP billing workflow.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| Policy | Continuous Positive Airway Pressure (CPAP) Therapy for Obstructive Sleep Apnea (OSA) |
| Policy Code | NCD 226 |
| Change Type | Modified |
| Effective Date | March 7, 2026 |
| Impact Level | High |
| Specialties Affected | Sleep medicine, pulmonology, DME suppliers, primary care, otolaryngology |
| Key Action | Audit your CPAP claim documentation against updated coverage criteria before submitting claims with dates of service on or after March 7, 2026 |
CMS CPAP Coverage Criteria and Medical Necessity Requirements 2026
CMS CPAP coverage policy under NCD 226 sets clear medical necessity thresholds. If your documentation doesn't hit these criteria exactly, expect a claim denial.
Coverage applies to adult patients with OSA. The initial benefit is limited to a 12-week trial period. After that 12-week window, continued CPAP coverage requires documented evidence that the patient benefited from therapy during the trial. This is not optional documentation — it's the gate to ongoing reimbursement.
AHI and RDI Thresholds for Medical Necessity
CMS sets two pathways to qualify for CPAP medical necessity:
Pathway 1: AHI or RDI greater than or equal to 15 events per hour. No additional symptoms required.
Pathway 2: AHI or RDI between 5 and 14 events per hour. This requires documented symptoms — at least one of the following:
| # | Covered Indication |
|---|---|
| 1 | Excessive daytime sleepiness |
| 2 | Impaired cognition |
| 3 | Mood disorders or insomnia |
| 4 | Hypertension |
| 5 | Ischemic heart disease |
| 6 | History of stroke |
If your patient falls into Pathway 2, the symptom documentation must be in the medical record before the claim goes out. Underdocumented files are the single most common reason CPAP claims come back denied.
Sleep Study Requirements
The diagnosis of OSA must come from a qualifying sleep study. CMS accepts four test types:
| # | Covered Indication |
|---|---|
| 1 | Attended polysomnography (PSG) in a facility-based sleep laboratory |
| 2 | Unattended Type II home sleep test (HST) |
| 3 | Unattended Type III HST |
| 4 | Unattended Type IV HST measuring at least three channels |
Type IV devices that measure fewer than three channels don't qualify. This is a detail that trips up billing teams regularly — check the device specs before assuming the study qualifies.
The treating physician must order the sleep test before it's performed. Post-hoc orders don't satisfy this requirement.
AHI and RDI Calculation Rules
CMS specifies how the AHI and RDI must be calculated when the recorded sleep period is short. If the study captures less than two hours of continuous sleep, the total number of recorded events must still meet the minimum threshold that would apply to a full two-hour period. You can't use a 45-minute study and extrapolate a qualifying AHI without meeting this floor. Flag short studies in your documentation review before billing.
Patient Education Requirement
This is one that gets overlooked. The CPAP provider must educate the patient in proper device use before initiating therapy. A caregiver — such as a family member — can fulfill this role if they are consistently present in the home and capable of operating the device. That caregiver involvement must be documented.
If your team doesn't have a process to capture education confirmation in the chart, build one now. CMS auditors look for this, and its absence can trigger recoupment on otherwise valid claims.
Physician Follow-Up and Continued Coverage
Continued CPAP coverage past the 12-week trial requires the treating physician to conduct a follow-up clinical evaluation. The purpose is to confirm the patient is using the device and benefiting from therapy. Without this follow-up documented, you lose the coverage bridge from the trial period into long-term use.
This creates a real operational gap for DME suppliers who don't have visibility into whether the prescribing physician has completed follow-up. Build a process to confirm follow-up documentation before submitting claims for ongoing rental.
CMS CPAP Exclusions and Non-Covered Indications
CPAP coverage under NCD 226 does not extend to pediatric patients. Coverage is limited to adults. If you're billing for a minor, this policy doesn't apply and coverage falls to other determination pathways.
CPAP is not covered without a positive OSA diagnosis supported by a qualifying sleep study. A clinical evaluation alone is not sufficient — it must be paired with objective sleep testing that meets the criteria above. Prescriptions based on clinical judgment without a qualifying study result in denied claims.
Continued coverage is not guaranteed after the 12-week trial. Patients who don't show benefit during that period lose coverage. If your team is auto-renewing rentals without checking trial outcome documentation, you're carrying real denial exposure.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Adult OSA with AHI/RDI ≥ 15 events/hour | Covered | Policy does not list specific codes | Requires qualifying sleep study ordered by treating physician |
| Adult OSA with AHI/RDI 5–14 events/hour + documented symptoms (sleepiness, cognitive impairment, mood disorder, insomnia) | Covered | Policy does not list specific codes | Symptom documentation must be in chart before claim submission |
| Adult OSA with AHI/RDI 5–14 events/hour + documented hypertension, ischemic heart disease, or stroke history | Covered | Policy does not list specific codes | Comorbidity documentation required |
| Initial 12-week trial period | Covered | Policy does not list specific codes | Coverage limited to identifying beneficiaries who benefit |
| Continued CPAP after 12-week trial (with documented benefit) | Covered | Policy does not list specific codes | Physician follow-up evaluation required to support ongoing coverage |
| CPAP without qualifying sleep study | Not Covered | — | Clinical evaluation alone does not satisfy diagnostic requirement |
| CPAP for pediatric patients | Not Covered | — | Policy applies to adults only |
| CPAP after 12-week trial without documented benefit | Not Covered | — | Benefit must be documented during trial period |
| Type IV HST measuring fewer than 3 channels | Not Covered | — | Device must measure at least 3 channels to qualify |
CMS CPAP Billing Guidelines and Action Items 2026
The effective date of March 7, 2026 means these requirements apply to claims with dates of service on and after that date. Don't wait for a denial wave to find your gaps.
| # | Action Item |
|---|---|
| 1 | Audit your sleep study documentation now. Confirm every active CPAP patient file includes a qualifying sleep study — PSG, Type II, III, or IV HST with at least three channels. Pull any file where the study type is unclear and verify before the next rental claim goes out. |
| 2 | Document AHI and RDI thresholds in your billing workflow. Build a checklist that captures which pathway the patient qualifies under — Pathway 1 (AHI/RDI ≥ 15) or Pathway 2 (AHI/RDI 5–14 with comorbidities or symptoms). This becomes your pre-bill quality check. |
| 3 | Flag Pathway 2 patients for symptom documentation review. For every patient with an AHI between 5 and 14, confirm the chart contains documented excessive daytime sleepiness, cognitive impairment, mood disorder, insomnia, hypertension, ischemic heart disease, or stroke history. Missing this documentation is a straight claim denial. |
| 4 | Create a 12-week trial tracking process. Your CPAP billing team needs a way to flag when a patient's 12-week trial period ends. At that point, you need documented physician follow-up confirming benefit before submitting claims for continued rental. If you're using a DME billing platform, build this as a workflow trigger. |
| 5 | Capture patient education documentation at setup. Every CPAP initiation needs documented proof that the patient — or a capable caregiver — was educated in device use. Make this part of your intake process, not an afterthought. |
| 6 | Verify short sleep study records before billing. If a patient's sleep study recorded less than two hours of continuous sleep, confirm the event count meets the minimum threshold CMS requires for a two-hour period. Studies that don't meet this floor don't qualify. |
| 7 | Confirm physician order preceded the sleep study. The treating physician must have ordered the sleep study before it was performed. Retroactive orders don't satisfy this requirement. If you can't confirm order timing, hold the claim and contact the ordering physician's office. |
If you're managing a high volume of CPAP rentals and you're not sure your workflows fully align with the updated NCD 226 Medicare requirements, talk to your compliance officer before March 7, 2026. CPAP billing is a frequent audit target, and documentation gaps compound quickly across a rental book.
| 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 CPAP Therapy Under NCD 226
This policy update does not list specific CPT, HCPCS, or ICD-10 codes. NCD 226 is a national coverage determination governing medical necessity criteria — it sets the rules for when CPAP is covered, not the billing codes used to submit claims.
For the specific HCPCS codes used to bill CPAP equipment and supplies under Medicare DME, refer to your Medicare Administrative Contractor's local coverage determination and associated billing guidance. MACs often publish companion LCDs that map NCD criteria to specific HCPCS codes for CPAP devices, masks, and accessories.
Work with your DME billing team or MAC to confirm which codes they recognize under this NCD, and verify that your charge capture reflects current fee schedule rates.
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