Guides / E0601
E0601 Continuous positive airway pressure (CPAP) deviceMedicare CPAP Documentation Requirements (E0601)
Citations verified against the CMS Medicare Coverage Database · Reviewed September 2026
CPAP is one of the highest-volume — and most-audited — items in DME. The coverage rules live in LCD L33718 (Positive Airway Pressure Devices), and they hinge on one thing above all: a qualifying sleep study documented in the clinical record before setup.
Below is the requirement set AffirmDME checks on every E0601 case, combining the universal SWO/face-to-face rules with the PAP-specific criteria.
The requirements, with citations
Every item below is a check AffirmDME runs automatically — this list mirrors the production rules engine, not a paraphrase of the regulations.
Sleep study results in the record
A qualifying sleep test (polysomnogram or approved home sleep test) must be documented — the study itself, not just a mention of it.
LCD L33718 — PAP device criteriaAHI / RDI documented in clinical notes
The apnea–hypopnea index or respiratory disturbance index from the study must appear in the record and meet LCD thresholds.
LCD L33718 — PAP qualifying criteriaFace-to-face encounter within 6 months
An in-person evaluation for sleep apnea within the 6 months before the order, documented in chart notes that are on file.
LCD L33718 — PAP F2F timing & documentationStandard Written Order (SWO) on file
A complete written order must exist before the claim is submitted — patient name, item description, quantity, ordering practitioner, and signature.
42 CFR 410.38(d)Order date and practitioner signature
The SWO must be dated and signed by the treating practitioner. Undated or unsigned orders are treated as no order at all.
42 CFR 410.38(d)Practitioner NPI on the order
The ordering practitioner's NPI must appear on the order and match PECOS enrollment.
42 CFR 410.38(d)Medical necessity in the clinical record
The medical record — not just the order — must support why the item is medically necessary for this patient.
CMS PA Documentation ChecklistLength of need documented for rental items
Since the 2020 SWO rule, length of need is no longer a required element of the order itself — but the DME MAC PA portals ask for it, and the record must support the expected duration of use. AffirmDME requires an estimated length of need (1–99 months; 99 = lifetime) on every capped-rental item so the packet never stalls on it.
42 CFR 410.38(d) — SWO elements (2020 rule); DME MAC PA request fieldsWhat usually sinks these claims
- The sleep study is referenced in notes but the actual report was never collected from the sleep lab
- AHI/RDI values don't appear anywhere in the submitted record
- The face-to-face evaluation predates the order by more than 6 months
- CPAP is a capped-rental item — and the order has no length of need
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Check a case freeFAQ
Does Medicare require prior authorization for CPAP?
No — E0601 isn't on the required prior-authorization list. But PAP devices are heavily reviewed after submission, so the same documentation must exist either way; it's just checked via prepayment review or an ADR instead of a PA decision.
What sleep study values does Medicare look for?
LCD L33718 keys on the AHI or RDI from a qualifying sleep test. The exact thresholds and comorbidity conditions are in the LCD — what matters for documentation is that the study report and its values are in the record you can produce.
What are Medicare's CPAP compliance requirements after setup?
Continued coverage beyond the first ~90 days requires documented adherence — device usage of at least 4 hours per night on 70% of nights in a consecutive 30-day window — plus a clinical re-evaluation documenting benefit. This guide covers initial claims; the adherence records become the target of later reviews.
What documents should a CPAP case file contain?
At minimum: the Standard Written Order, face-to-face chart notes from the qualifying evaluation, and the sleep study report. That's the exact set AffirmDME's checklist verifies on an E0601 case.
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This guide summarizes Medicare requirements as implemented in AffirmDME's compliance engine, with citations to the governing sources. It is not legal or billing advice; LCDs and CMS policy change — always confirm against the current policy text linked above.
More guides
- Medicare ADR Letters: how to respond without losing the claim
- Medicare DME Documentation Requirements: the checklist every claim needs
- Medicare Home Oxygen Documentation Requirements (E1390)
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- The Medicare DMEPOS Required Prior Authorization List, explained (2026)
- Probationary Prior Authorization for newly enrolled DMEPOS suppliers (Oct 15, 2026)
- The DMEPOS prior authorization exemption: how it works and how to keep it
- Which DME MAC handles your claim: Jurisdictions A, B, C, and D
- Standard Written Order (SWO) requirements for Medicare DME
- Medicare DME face-to-face encounter requirements
- Prior authorization vs ADR vs prepayment review vs TPE: what each means for a DME claim
- After a non-affirmed prior authorization: resubmit, deliver with an ABN, or wait
- Medicare DME proof of delivery requirements
- Preparing and submitting a DMEPOS prior authorization request
Unfamiliar term? The glossary defines ADR, SWO, UTN, PTAN and the rest; the PA List lookup checks any HCPCS code.