Home Use of Oxygen — NCD 169 | CMS Coverage Update

TL;DR: The Centers for Medicare & Medicaid Services modified NCD 169, the National Coverage Determination governing Medicare home oxygen coverage, with an effective date of March 7, 2026. Here's what billing teams need to know.

This update to the CMS home oxygen coverage policy refines the clinical criteria billing teams must document to support medical necessity. NCD 169 in the Medicare system covers oxygen and oxygen equipment as durable medical equipment (DME) for home use. No specific HCPCS billing codes are listed in this version of the policy — but the documentation and clinical threshold requirements that drive your claim approval or claim denial are detailed and worth knowing cold.

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Field	Detail
Payer	CMS (Centers for Medicare & Medicaid Services)
Policy	Home Use of Oxygen
Policy Code	NCD 169
Change Type	Modified
Effective Date	2026-03-07
Impact Level	High
Specialties Affected	Pulmonology, Internal Medicine, Home Health, DME Suppliers, Respiratory Therapy
Key Action	Audit your qualifying test documentation against the Group I thresholds before submitting home oxygen claims after March 7, 2026

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CMS Home Oxygen Coverage Criteria and Medical Necessity Requirements 2026

The CMS home oxygen coverage policy covers oxygen and oxygen equipment for both acute and chronic conditions, short- or long-term, when the patient shows documented hypoxemia. That last word is doing all the work here. Without proper hypoxemia documentation, there is no coverage. Full stop.

Medical necessity under NCD 169 starts with a clinical test ordered and evaluated by the treating practitioner. That test is almost always an arterial blood gas (ABG) measurement — specifically the partial pressure of oxygen, or PO2. Ear or pulse oximetry is also acceptable, but only when the treating practitioner orders it, evaluates it, and either supervises it directly or a qualified lab provider performs it.

Here's the rule that trips up DME suppliers: a DME supplier is not a qualified provider or supplier of laboratory services under this NCD. The DME supplier cannot conduct the qualifying oximetry test and use those results to support the claim. This prohibition does not apply to blood gas tests conducted by a hospital certified to perform them.

When ABG and oximetry results both exist and they conflict, the ABG wins. Document it that way and keep both results in the file.

Timing of Qualifying Tests

The qualifying test must happen "at the time of need." CMS defines this precisely.

For inpatient hospital patients, the qualifying test must occur within two days of discharge. For patients whose oxygen prescription starts outside a hospital stay, the test must happen during the period when the treating practitioner documents signs and symptoms of illness that oxygen can relieve.

This timing requirement is a common source of claim denial. A test done three days before discharge or weeks before an outpatient prescription is written will not satisfy the standard. Train your intake team to check test dates before submitting.

Group I Coverage Criteria

Group I covers patients who meet any one of these thresholds:

At rest: Arterial PO2 at or below 55 mm Hg, or arterial oxygen saturation at or below 88%, breathing room air.

During sleep: Arterial PO2 at or below 55 mm Hg, or saturation at or below 88% during sleep — for a patient who shows PO2 at or above 56 mm Hg or saturation at or above 89% while awake. Coverage here is limited to oxygen use during sleep only, and only one type of unit is covered. Portable oxygen is not covered under this indication. Also covered under the sleep category: a greater than normal fall in oxygen during sleep — defined as a drop in arterial PO2 of more than 10 mm Hg or a drop in saturation of more than 5% — paired with symptoms or signs reasonably linked to hypoxemia, such as cognitive impairment, nocturnal restlessness, or insomnia.

During exercise: Arterial PO2 at or below 55 mm Hg, or saturation at or below 88% during exercise — for a patient who shows PO2 at or above 56 mm Hg or saturation at or above 89% at rest during the day. Coverage applies only during exercise and only if supplemental oxygen demonstrably improves the hypoxemia shown during exercise on room air.

These are not soft guidelines. They are hard numerical thresholds. If the test result is 56 mm Hg at rest, the patient does not qualify for Group I at-rest coverage. Document the exact values.

Group II Coverage Criteria

The source policy data for this version of NCD 169 does not include the complete Group II criteria — the policy summary was truncated at that section. Refer to the full published NCD text at CMS.gov or your MAC's LCD for complete Group II documentation requirements.

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CMS Home Oxygen Exclusions and Non-Covered Indications

The policy does not cover home oxygen when the patient fails to meet the qualifying thresholds. That sounds obvious, but the documentation failures that create denials are almost always upstream — a test done at the wrong time, a test performed by a disqualified party, or a result that doesn't hit the numerical threshold.

Portable oxygen units are explicitly not covered when the qualifying indication is oxygen use during sleep only. If the patient qualifies solely under the sleep-related criteria, do not bill for a portable unit. That's a coverage exclusion built directly into the NCD.

DME suppliers who perform their own oximetry tests and attempt to use those results as qualifying documentation will face denial. CMS is explicit: the DME supplier is not a qualified lab provider under this NCD. Any claim built on supplier-conducted oximetry — outside of hospital-certified blood gas testing — is not supported by this policy.

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Coverage Indications at a Glance

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CMS Home Oxygen Billing Guidelines and Action Items 2026

The effective date of March 7, 2026 is already in effect. If you haven't reviewed your home oxygen billing workflow against these criteria, do it now.

Copy Action Items

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CPT, HCPCS, and ICD-10 Codes for Home Oxygen Under NCD 169

NCD 169 as provided in this version does not list specific HCPCS, CPT, or ICD-10 codes. This is not unusual for a National Coverage Determination — NCDs set the coverage and medical necessity framework, while the actual billing codes for home oxygen equipment are typically addressed in your MAC's Local Coverage Article (LCA) or LCD.

For the applicable HCPCS E-codes and covered diagnosis codes, go directly to your MAC's LCD and LCA for home oxygen. Do not guess at the code list. Your MAC's coverage article will have the full set of codes with coverage conditions tied to the criteria in NCD 169.

If your MAC hasn't published a current LCD that maps to NCD 169's updated criteria, contact your MAC's provider outreach team. A coverage policy update at the NCD level without a corresponding LCD update from your MAC is worth flagging — your billing team shouldn't be guessing at the code list.

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