Sleep Medicine Billing 2026: PSG Codes, CPAP Setup & HST Billing Rules

Sleep medicine billing isn't particularly difficult — but it's got a handful of rules that catch practices off guard, especially around split-night studies, home sleep test timing, and CPAP supply billing. Miss one and you're looking at a denial that takes three times as long to appeal as it would've taken to get right the first time.

Here's a practical walkthrough of what applies in 2026, from the diagnostic study through PAP therapy management.

Diagnostic Sleep Study CPT Codes

The attended vs. unattended distinction matters. A technologist must be present for attended PSG codes (95810, 95811). Home sleep tests are unattended by definition — the patient takes the device home and records independently.

Split-Night Studies: One Code, Not Two

A split-night study is when the first half of the night is used for diagnostic recording and the second half for CPAP titration — all in one encounter. You bill 95811 for the entire night. Not 95810 plus 95811. One code.

CMS requires at least 2 hours of diagnostic recording and an AHI of 40 or greater (or 20+ with complicating factors) before switching to titration mid-night. Document the exact times and the AHI that triggered the protocol change. Payers audit this.

Home Sleep Testing (HST)

Most commercial payers and Medicare prefer HST over in-lab PSG for straightforward adult patients with suspected obstructive sleep apnea. It's cheaper for them, and for uncomplicated cases, the diagnostic accuracy is adequate.

The billing nuance: who owns the HST device matters. If your practice owns the device and loans it to the patient, you can bill for the technical component. If the patient rents a device from a DME supplier, the DME company bills for the device and your practice bills only for the interpretation (modifier 26).

When HST Isn't Appropriate

HST is not appropriate — and payers will deny if it's used — when the patient has significant comorbidities: congestive heart failure, COPD, neuromuscular disease, or suspected non-OSA sleep disorders like central sleep apnea, periodic limb movement disorder, or parasomnias. Those patients need full attended PSG. Document the clinical reason for ordering in-lab rather than home testing or you'll spend time defending an unnecessary in-lab denial.

CPAP Setup and Management Codes

94660 is billed by the physician or qualified provider for the face-to-face encounter when setting up or managing CPAP therapy. It's a professional service — not a facility or equipment code. The DME supplier bills separately for the physical CPAP device under HCPCS E0601.

CPAP Supply Billing

CPAP supplies — masks, tubing, filters, chinstraps, headgear — bill under HCPCS codes through a DME supplier, not through the physician practice. If your practice is also functioning as a DME supplier, you need a separate DME supplier number and billing system. Practices that try to bill CPAP supplies through their professional billing without DME accreditation run into immediate denial and potential compliance issues.

Prior Authorization for Sleep Studies

Virtually every commercial payer requires prior auth for in-lab PSG. Many also require it for HST, though the bar is lower. The auth criteria almost always include a clinical questionnaire (Epworth Sleepiness Scale, STOP-BANG) and documented symptoms.

The denial pattern we see most often: a sleep physician orders a PSG after a clinical visit, the auth is submitted with the CPT code but without the supporting documentation, and the payer denies for lack of medical necessity. Fix this by attaching the questionnaire scores and the clinical note with the auth submission — don't make the payer ask for it.

Interpretation vs. Technical Component

If your practice reads studies from an outside sleep lab, you're billing only the professional component (26 modifier). If you own your own lab and perform both the technical and professional components, you bill the global code. Don't bill global if you don't own the facility — that's a compliance problem, not just a billing error.

References

• AASM Clinical Practice Guidelines for the Treatment of Obstructive Sleep Apnea, 2026
• CMS LCD L33240 — Sleep Testing
• AMA CPT 2026 — Pulmonary/Sleep Medicine Section
• Medicare CPAP Coverage Policy (NCD 240.4)