Sleep medicine billing services for sleep labs and practices

The sleep medicine codes we bill most

Modifiers that matter

Payer rules to know

Top denials in sleep medicine billing services for sleep labs and practices

Which sleep tests exist, and which codes does each one use?

Medicare recognizes four kinds of sleep test for diagnosing obstructive sleep apnea (OSA), and each has its own code family. National Coverage Determination 240.4.1, effective March 3, 2009, lists Type I attended polysomnography in a sleep lab, Type II and III devices, and Type IV devices measuring at least three channels including airflow.

The NCCI Medicare Policy Manual, chapter XI, says polysomnography differs from a sleep study because it requires sleep staging, and that a sleep study and polysomnography are not reported separately for the same patient encounter. An EEG done at a separate encounter on the same date takes modifier 59 or XE; neurology billing covers the EEG side.

Status C is the detail that surprises billing teams. The October 2026 CMS fee schedule file (RVU26D, released August 26, 2026) lists G0398, G0399 and G0400 with zero relative value units and status C, which CMS defines as codes the contractors price.

How do we split professional and technical billing for sleep studies?

Whoever owns the equipment and the technologist bills the technical component with modifier TC, and the physician who interprets the study bills the professional component with modifier 26. When one entity does both, it bills the code once with no modifier. Every code in the table above carries PC/TC indicator 1 in the 2026 CMS file, so both modifiers are valid on all of them, including the three home test G-codes.

In the October 2026 file, 95810 has a 26 row with practice expense value 1.03 and a TC row with 16.44 and no work value. The technical side holds most of the relative value, so a credentialing denial on the TC claim costs a lab most of the study's revenue.

Who may bill the TC is a policy question, not a coding one. Palmetto GBA's polysomnography policy, L36593, says the technical component of polysomnography and sleep testing, including home tests, must be furnished by an accredited sleep center or laboratory. The only exception it names is global billing of a home sleep test by an office-based physician who meets its training and certification requirements. Under that exception the physician interprets the test and bills it globally.

Hospital outpatient departments split the claim across forms: the hospital reports the technical side on the UB-04 and the physician reports the interpretation on the CMS-1500. Pulmonology billing explains that setting rule.

What accreditation and physician supervision does a sleep lab need?

The four Medicare contractors cited here require accreditation from the American Academy of Sleep Medicine (AASM), the Joint Commission ambulatory sleep program or the Accreditation Commission for Health Care (ACHC). Palmetto GBA's L36593 (revised March 20, 2025), Noridian's L36861 (revised September 11, 2025), Wisconsin Physicians Service's L36839 (revised June 26, 2025) and CGS's L36902 (revised March 5, 2026) all say so.

Physician and technologist qualifications sit next to accreditation. Palmetto's policy says the lab must be hospital-affiliated or under the direction and control of an MD or DO, and the interpreting physician must review the raw data. That physician must hold sleep medicine certification through the American Board of Sleep Medicine or a member board of the ABMS or AOA, or must have finished an ACGME sleep fellowship and certified within two exam cycles. Technologists need credentials such as RPSGT or RST, or must work in an accredited facility.

Noridian requires a technologist physically present during sleep time with the ability to intervene. Its article says 95808, 95810 and 95811 must be performed in a facility-based sleep lab and not in the home or a mobile facility. WPS requires the attending physician's order to be kept in the record.

Contractors differ in detail, and First Coast publishes its own policy, L33405, so check it as well. Before you enroll a lab or add a reader, pull the current LCD and billing article for your jurisdiction from the Medicare Coverage Database.

How do we bill home sleep apnea tests?

Bill the G-code that matches the monitor: G0398 for type II (at least seven channels), G0399 for type III (four) and G0400 for type IV (three). The October 2026 HCPCS file gives those channel minimums. Palmetto's billing article says the G-codes and CPT 95800, 95801 and 95806 all involve the absence of a technologist.

A home test claim is only as good as the visit and instruction behind it. Noridian's billing article requires documentation that the test was done with a comprehensive sleep evaluation in a patient with a high pretest probability of moderate to severe OSA. The provider must teach the patient to apply the monitor, and the report must show the device and channels.

Medicare covers the test only for a patient with signs and symptoms of OSA. The DME contractors' CPAP policy, L33718, adds that the test must be ordered by the treating practitioner, use an FDA-approved diagnostic device and be conducted by a qualified Medicare provider of sleep tests. Diagnoses must come from the contractor's list; Palmetto's article allows only G47.10 and G47.33 for unattended studies.

Commercial plans set their own home test rules; the UnitedHealthcare list below excludes home studies from its sleep study authorization rule.

How many sleep studies, titrations and MSLTs will Medicare pay for?

Noridian's article sets the clearest numbers: more than two polysomnography sessions in a year interval need persuasive medical evidence, more than one home test in a year does too. Routine use of more than one polysomnography to titrate CPAP is not considered reasonable and necessary. A multiple sleep latency test (MSLT), a series of daytime naps, bills one unit for all naps in a day. Other contractors set their own limits.

Noridian's L36861 and Palmetto's L36593 both allow an initial diagnostic polysomnogram followed by CPAP titration on the same night in place of two separate nights, but only if the titration runs more than three hours and the recording shows CPAP eliminates or nearly eliminates respiratory events in REM and non-REM sleep.

An MSLT depends on the night before. Palmetto and Noridian both require polysomnography the night before for a valid MSLT. Palmetto adds that an MSLT is not routinely indicated for sleep apnea and that actigraphy is not paid separately.

Repeat studies need a reason in the chart. Palmetto accepts a technically inadequate first study, too little sleep recorded, inconclusive results, or the need to start or confirm therapy. Noridian and Palmetto also accept substantial weight change with symptoms and a lost response to CPAP as reasons for a follow-up study.

What does Medicare require for CPAP coverage, and what is the 12-week rule?

Medicare covers CPAP for adults with OSA for an initial 12-week period and keeps paying only if the patient benefits during it. National Coverage Determination 240.4, effective March 13, 2008, sets that limit. It requires a clinical evaluation and a positive sleep test ordered by the treating physician. The apnea-hypopnea index (AHI) or respiratory disturbance index must be at least 15 events per hour, or 5 to 14 with a documented symptom or condition such as daytime sleepiness, hypertension or prior stroke.

The adherence test sits in the DME contractors' policy, L33718 (revised January 1, 2024), not in the national determination. It requires an in-person clinical re-evaluation no sooner than the 31st day and no later than the 91st day after therapy starts, documenting improved OSA symptoms. It also requires objective evidence of adherence that the treating practitioner has reviewed: use of PAP for at least four hours a night on 70 percent of nights during a consecutive 30-day period within the first three months.

A patient first seen on day 100 has coverage resume only from that visit. The policy also says a bilevel device (E0470) is covered only after the E0601 CPAP device is tried and proven ineffective, and that E0471 is not reasonable and necessary when the primary diagnosis is OSA.

Supply billing is the supplier's job. Policy article A52467 tells suppliers to add modifier KX to PAP claims only when coverage criteria are met, and to leave it off month four onward if the re-evaluation and adherence data have not arrived. See durable medical equipment billing for rentals and DME MAC rules, and the KX modifier page.

Is hypoglossal nerve stimulation covered, and how is it billed?

Medicare contractors cover hypoglossal nerve stimulation under local policies for adults who cannot use CPAP, billed with CPT 64582, 64583 and 64584. All three have status A and a 90-day global period in the October 2026 file. CMS billing article A57092, effective for dates of service from January 1, 2022, assigns 64582 to insertion, 64583 to revising or replacing the electrodes with the existing generator, and 64584 to removal.

There is no national coverage determination, so the criteria come from the LCD for your contractor. Palmetto's L38276 (revised May 14, 2026) and Noridian's L38310 (revised October 16, 2025) share the same core: the patient is at least 22 years old with a body mass index below 35, has a polysomnography within 24 months of the first consultation with an AHI of 15 to 65, and has central and mixed apneas below 25 percent of the total AHI. Both require CPAP failure (an AHI above 15 on CPAP) or CPAP intolerance, and no complete concentric collapse at the soft palate on drug-induced sleep endoscopy.

Intolerance wording differs. Noridian says use under four hours a night, five nights a week, or the CPAP returned. Palmetto says machine-reported use under four hours on at least 70 percent of nights in a month, or the device returned, with shared decision-making.

Coverage needs two diagnoses. Article A57092, which accompanies LCD L38387, requires a primary G47.33 for obstructive sleep apnea and a secondary Z68 code showing a BMI below 35. The article says 64584 has no diagnosis restriction. ENT billing covers the surgical side.

Which sleep tests need prior authorization?

UnitedHealthcare's commercial advance notification list, effective January 1, 2026, requires prior authorization for laboratory-based sleep studies 95805, 95807, 95808, 95810 and 95811, and excludes studies performed in the home. Sleep apnea surgery codes including 21685, 41599 and 42145 also need it in all states.

Our prior authorization service tracks the number, code and dates. The UnitedHealthcare billing guide and the Medicare billing guide cover the payer-specific side.

How do we handle sleep medicine billing at Nucleus Align?

We bill sleep medicine on both forms, the CMS-1500 for professional and office claims and the UB-04 for hospital technical claims. Before a lab goes live we confirm accreditation, reader credentials and the contractor policy for its location. Claims go out within 24 hours of charge entry and denials are worked within 48 hours.

Each study is checked for code family, the 26 and TC split, frequency limits and authorization. Each CPAP patient gets a day 31 to 91 reminder so the re-evaluation and adherence report are in the chart.

If your lab's claims are stuck on accreditation questions, frequency denials or CPAP records, book a call and we will review your recent remits.