DME Prior Authorization: The Required List and How It Works

The Centers for Medicare & Medicaid Services (CMS) requires prior authorization before payment for specific categories of durable medical equipment, prosthetics, orthotics, and supplies, known collectively as DMEPOS. A supplier that delivers a listed item without an approved request, or that submits a claim after a non-affirmation decision, faces an automatic denial no matter how well-documented the medical necessity is. Misreading the Required Prior Authorization List is one of the few documentation errors that can end a claim before a contractor ever reaches the clinical record.

What Is On the Required Prior Authorization List

CMS maintains two related lists for DMEPOS: a Master List of items that could become subject to prior authorization, and the narrower Required Prior Authorization List of items that currently require it as a condition of payment. As of CMS's own current posting, the Required List spans six categories: orthoses, power mobility devices, pressure-reducing support surfaces, lower-limb prosthetics, pneumatic compression devices, and manual wheelchair bases. CMS updates the Required List periodically through Federal Register notice, most recently adding items effective April 13, 2026, and October 28, 2026. A supplier's billing staff cannot rely on last year's list; each HCPCS code carries its own effective date, and prior authorization is a condition of payment only from that date forward.

Provisional Affirmation and Non-Affirmation

Once a prior authorization request is submitted, the Medicare contractor issues one of two decisions. A provisional affirmation is a preliminary finding that the claim, if submitted as described, meets Medicare's coverage, coding, and payment rules; the contractor will still pay the resulting claim so long as every other billing requirement is met. A non-affirmation means the contractor found the request does not meet those rules as submitted. Effective January 1, 2025, CMS reduced its review target for standard requests to 7 calendar days, with a 2-business-day target for expedited requests involving a beneficiary's health or life. A claim billed with a non-affirmed decision, or with no decision at all, is denied automatically.

A non-affirmation is not a payment determination, so Medicare's appeal rules do not treat it as independently appealable.

Resubmission After a Non-Affirmation

A non-affirmation is not the end of the request. Under the prior authorization regulation at 42 C.F.R. § 414.234, a supplier may resubmit a prior authorization request as many times as needed, so long as the resubmission happens before the item is furnished and before a claim is filed. Each resubmission should address the specific reasons stated in the contractor's decision letter, whether that is a missing physician order, an incomplete element covered in Physician Orders and Certifications Under Audit, or a coverage criterion the contractor read differently than the supplier did. CMS's own exemption process adds a further incentive to get resubmissions right: a supplier that reaches a 90% or higher provisional affirmation rate may qualify for exemption from the prior authorization requirement entirely.

What Happens If a Claim Bypasses Prior Authorization

A supplier that ships the item and bills Medicare without an affirmed request, or despite a non-affirmation, will see the claim denied on its face. That denial, unlike the prior authorization decision itself, is an initial payment determination, which carries standard appeal rights and can be challenged the way any other denied DME claim is challenged. It can also trigger closer scrutiny: a pattern of claims billed around a non-affirmed prior authorization is the kind of documentation gap that invites a RAC or local coverage determination-based postpayment review, and a reviewer who finds the pattern across a sample of claims can extrapolate it into a six- or seven-figure recoupment demand. Suppliers who clear prior authorization have simply moved past the first gate covered in HLA's Medicare audit defense work.

Why Early Legal Counsel Is Critical

DME suppliers should retain healthcare defense counsel as soon as a non-affirmation decision, a denial pattern, or an audit notice arrives, not after the next resubmission is already filed. Counsel can read the contractor's stated reasons before that resubmission, keep an inadvertent admission out of it, and communicate with the contractor on the supplier's behalf.

Health Law Alliance's attorneys have overseen 2,000+ audits and handled 5,000+ matters, with 25+ years of experience.

How Health Law Alliance Can Help

Health Law Alliance defends DME suppliers facing DME MAC, ZPIC, UPIC, and RAC audits, including the appeals and litigation that can follow a denied claim. If a prior authorization denial or an audit notice has already reached your business, contact us for a free, confidential consultation through our DME audit defense practice to review the claim before you respond.