Home oxygen order workflow and DME coordination

Quick answer

Home oxygen orders and DME

The home oxygen order workflow now requires a documented face-to-face encounter within the six months preceding the written order, and a signed standard written order before delivery. Oxygen codes were added to the Required Face-to-Face Encounter and Written Order Prior to Delivery List during 2026, and the old Certificate of Medical Necessity was eliminated in 2023.

Two things about home oxygen changed recently and the second one changed this year.

The Certificate of Medical Necessity, the form everyone associated with an oxygen order, was eliminated for dates of service from January 2023. Claims submitted with one are rejected.

And in 2026 oxygen was added to the list of items requiring a face-to-face encounter and a written order prior to delivery. That is a procedural change that lands directly on the prescriber, and nearly every piece of older guidance says oxygen carries no such requirement.

The RealityThe rules changed twice this year

⚠️

The Problem

A workflow built for a form that no longer exists.

Staff chasing a Certificate of Medical Necessity, and nobody tracking the encounter date the claim now depends on.

🔧

The Solution

Rebuild around the current requirements.

Qualifying study at the right time, encounter inside the window, and a compliant written order before delivery.

✅

The Resolution

Orders that survive a review.

Patients on oxygen without a second round of paperwork, and a supplier who can bill.

The qualifying blood gas study, and the exact thresholds

These numbers are worth quoting precisely, because paraphrasing a clinical threshold is how errors enter a record.

National Coverage Determination 240.2 covers home oxygen for acute or chronic conditions, short or long term, where the patient exhibits hypoxemia as defined in the policy. Group I is an arterial PO2 at or below 55 mm Hg, or an arterial oxygen saturation at or below 88 per cent, taken at rest breathing room air; or the same values during sleep for a patient at or above 56 mm Hg or 89 per cent while awake; or the same values during exercise for a patient at or above 56 mm Hg or 89 per cent during the day at rest.

Group II covers patients whose arterial PO2 is 56 to 59 mm Hg or whose saturation is 89 per cent, where there is dependent edema suggesting congestive heart failure, or pulmonary hypertension or cor pulmonale determined by specified measurement, or erythrocythemia with a hematocrit greater than 56 per cent.

One note on structure. The NCD has Group I and Group II. A Group III appears in the local coverage determination, not the NCD, covering patients without hypoxemia where a condition is documented in high-quality peer-reviewed literature to be improved by oxygen therapy. Attributing Group III to the NCD is a common error.

Timing, and who may perform the test

Two constraints that a workflow has to enforce because nobody remembers them under pressure.

The NCD states that required qualifying arterial blood gas or oximetry studies must be performed at the time of need, and that for an inpatient the time of need is within two days of discharge. Where both an arterial blood gas study and an oximetry study are used and the results conflict, the arterial blood gas study is the preferred source.

And a supplier is not a qualified provider or supplier of laboratory services for the purposes of this NCD. The local coverage determination adds that the treating practitioner must have ordered and evaluated the results of a qualifying blood gas study, and that the study must have been performed by a treating practitioner or by a qualified provider or supplier of laboratory services. A saturation reading taken by the DME company does not qualify the patient.

Key takeaway

The Certificate of Medical Necessity is gone. CMS eliminated the CMS-484 oxygen CMN along with seven other forms for dates of service on or after 1 January 2023, and states that claims submitted with them will be rejected and returned.

The standard written order

What replaced the certificate is shorter and more general, which makes it easier to get wrong by omission.

42 CFR 410.38 lists the required elements of a standard written order: beneficiary name or Medicare Beneficiary Identifier; a general description of the item; quantity to be dispensed, if applicable; order date; treating practitioner name or National Provider Identifier; and treating practitioner signature.

Six elements. The local coverage determination adds the timing: a standard written order must be communicated to the supplier before a claim is submitted, and for items requiring a written order prior to delivery, the supplier must have received a signed order before the item is delivered to the beneficiary.

Practice staff coordinating a home oxygen order with a DME supplier — A home oxygen order is a clinical decision, a qualifying test, a written order and an encounter that has to have happened in a specific window. Miss one and the claim fails.

The face-to-face encounter requirement, which is new for oxygen

This is the change to act on, and it arrived in two stages during 2026.

42 CFR 410.38 requires the treating practitioner to document a face-to-face encounter with the beneficiary within the six months preceding the date of the written order, for items on the Required Face-to-Face Encounter and Written Order Prior to Delivery List. The encounter must be used for the purpose of gathering subjective and objective information associated with diagnosing, treating, or managing a clinical condition for which the item is ordered. Telehealth is permitted where the relevant conditions are met.

The list is the operative part, and oxygen was not on it until this year. A Federal Register notice published 13 January 2026 selected eight codes related to oxygen and its delivery systems, effective 13 April 2026. A further notice published 30 July 2026 added a portable gaseous oxygen system code effective 28 October 2026, noting that oxygen supplies and equipment were identified by CMS’s error rate testing programme as within the top 20 DMEPOS service types with improper payments in 2025.

So as of this year a home oxygen order requires both a documented encounter inside a six-month window and a signed written order before delivery. If your workflow does not capture the encounter date and make it visible to whoever writes the order, it is not capturing the thing the claim now turns on. That is a template and reporting question as much as a clinical one, and it belongs in EHR workflow optimization.

Qventive Healthcare

Oxygen orders bouncing back from the supplier?

We check your order workflow against the current requirements, including the 2026 face-to-face changes, and hand you written findings.

Get Your Free Assessment (201) 488-2750

Improper payments, and why the scrutiny exists

Worth knowing the numbers, because they explain the direction of travel.

CMS’s provider compliance material on oxygen reports an improper payment rate of 11.3 per cent for oxygen supplies and equipment for the 2024 reporting period, with a projected improper payment amount of 81 million dollars, and states that insufficient documentation accounted for 59.3 per cent of improper payments.

OIG has an active review of Medicare payments to suppliers for oxygen and oxygen equipment, noting that Medicare paid more than 674 million dollars for oxygen and oxygen equipment in 2023 and that CMS has consistently identified high rates of improper payment through its error rate testing programme. Insufficient documentation being the dominant error category is the practical point: these are not mostly clinical disagreements, they are missing paperwork.

Stop looking for the CMN. Eliminated for dates of service from 1 January 2023.
Capture the encounter date. Six months preceding the written order.
Six elements on the written order. Signed, before delivery.
The supplier cannot qualify the patient. The study has to come from the right source.

Qventive provides home oxygen order workflow help for medical practices in New Jersey, usually within IT support for pulmonology practices rather than as a standalone project.

Where the workflow depends on templates or on an interface to a supplier, that work runs through pulmonology EHR and IT support, and any data path to a DME company belongs in your HIPAA risk analysis.

Home oxygen orders: common questions

Do we still need a Certificate of Medical Necessity for oxygen?

No, and submitting one now causes a problem rather than solving one. CMS discontinued Certificates of Medical Necessity and DME Information Forms for claims with dates of service on or after 1 January 2023. The CMS-484 oxygen CMN was on that list, along with forms for pneumatic compression devices, osteogenesis stimulators, transcutaneous electrical nerve stimulators, seat lift mechanisms, external infusion pumps, and enteral and parenteral nutrition. CMS’s guidance is explicit that for services on or after 1 January 2023 you should not submit CMN or DIF forms or their electronic claim data elements with claims, or the claims will be rejected and returned. What replaced them is the standard written order plus the underlying medical record documentation. Practices still running a CMN step in their oxygen workflow are usually doing it because the form was the thing that forced the other documentation to be gathered, which is a real loss and worth replacing deliberately rather than just deleting.

What are the actual qualifying thresholds for home oxygen?

The National Coverage Determination sets them precisely and they are worth quoting rather than paraphrasing. Group I is an arterial PO2 at or below 55 mm Hg, or an arterial oxygen saturation at or below 88 per cent, taken at rest breathing room air. The same values taken during sleep qualify a patient who is at or above 56 mm Hg or 89 per cent while awake, and in that case coverage is only for oxygen during sleep and only one type of unit, so portable oxygen would not be covered. The same values taken during exercise qualify a patient who is at or above 56 mm Hg or 89 per cent during the day at rest. Group II covers a PO2 of 56 to 59 mm Hg or a saturation of 89 per cent where there is dependent edema suggesting congestive heart failure, pulmonary hypertension or cor pulmonale determined by specified measurement, or erythrocythemia with a hematocrit greater than 56 per cent. Note that Group III is a local coverage determination construct and is not in the NCD.

Does home oxygen now need a face-to-face encounter?

Yes, as of 2026, and this is the change most likely to catch a practice out because nearly all older guidance says otherwise. 42 CFR 410.38 requires a documented face-to-face encounter with the beneficiary within the six months preceding the date of the written order, for items on the Required Face-to-Face Encounter and Written Order Prior to Delivery List, and the encounter must be used for gathering subjective and objective information associated with diagnosing, treating or managing the clinical condition for which the item is ordered. Oxygen was not on that list until this year. A Federal Register notice published 13 January 2026 selected eight codes related to oxygen and its delivery systems with an effective date of 13 April 2026, and a further notice published 30 July 2026 added a portable gaseous oxygen system code effective 28 October 2026. Telehealth encounters are permitted where the applicable conditions are met, which matters for practices whose follow-up is largely remote.

What are the HIPAA implications of coordinating with a DME supplier?

Supplier coordination creates a steady outbound flow of clinical detail and it is often handled by the least formal route in the practice. Fax and email to suppliers: what is being sent, is it more than the supplier needs, and is the minimum necessary standard being applied, because a full chart sent to answer a documentation request is a common and avoidable over-disclosure. Supplier portals where staff upload documentation: who holds accounts, is multi-factor authentication enforced, and is the list reviewed when someone leaves. Standing requests, where a supplier has been given ongoing access to pull documentation rather than being sent it, which is a different arrangement and needs a different answer. Whether the supplier is a business associate at all, which turns on what they are doing rather than on what they are called. In our engagements the supplier portal accounts are the item most often missing from the access review, because they were created by clinical staff rather than by IT.

Why is there so much scrutiny on oxygen claims?

Because the error rate is high and the errors are documentation errors rather than clinical ones. CMS’s provider compliance material reports an improper payment rate of 11.3 per cent for oxygen supplies and equipment for the 2024 reporting period, with a projected improper payment amount of 81 million dollars, and states that insufficient documentation accounted for 59.3 per cent of those improper payments. OIG has an active review of Medicare payments to suppliers for oxygen and oxygen equipment, noting Medicare paid more than 674 million dollars in 2023 and that CMS has consistently identified high improper payment rates through its error rate testing programme. CMS’s own stated rationale for adding oxygen to the face-to-face and written order list in 2026 was that oxygen supplies and equipment were identified by that programme as within the top 20 DMEPOS service types with improper payments in 2025. The encouraging reading is that a practice with a disciplined documentation workflow is not the target of any of this.

Ready when you are

Let’s meet

Qventive supports pulmonology practices across New Jersey. Thirty years healthcare-exclusive, from our office in Hackensack.

Let’s Meet (201) 488-2750

Sources

Group I: arterial PO2 at or below 55 mm Hg or saturation at or below 88 per cent at rest breathing room air. Group II: PO2 56-59 mm Hg or saturation 89 per cent with specified findings. cms.gov
Standard written order elements: beneficiary name or MBI, general description, quantity if applicable, order date, practitioner name or NPI, practitioner signature; face-to-face within the six months preceding the order. ecfr.gov
CMS-484 oxygen CMN eliminated for dates of service on or after 1 January 2023; claims submitted with one are rejected. cms.gov
Eight oxygen-related codes added to the Required Face-to-Face Encounter and Written Order Prior to Delivery List, effective 13 April 2026. federalregister.gov

Qventive Healthcare

Healthcare IT consulting and managed services, healthcare-exclusive since 1994. 200 Passaic Street, Hackensack, New Jersey. We serve as a business associate to the practices we support.

Home oxygen order workflow and DME coordination

Home oxygen order workflow and DME coordination

The qualifying blood gas study, and the exact thresholds

Timing, and who may perform the test

The standard written order

The face-to-face encounter requirement, which is new for oxygen

Oxygen orders bouncing back from the supplier?

Improper payments, and why the scrutiny exists

Home oxygen orders: common questions

Let’s meet

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