“Is my state affected yet?” is the wrong question to ask about Medicare’s DMEPOS prior authorization program in 2026 — and getting that distinction right matters, because there are actually two separate CMS prior-authorization initiatives moving in 2026, and mixing them up will send your team chasing the wrong compliance checklist. One is a long-running, now-nationwide program that just expanded its code list. The other is a genuinely state-limited pilot that has nothing to do with DME. Here’s how to tell them apart and what each one actually requires.
The DMEPOS Required Prior Authorization program is already nationwide
CMS’s prior authorization process for certain Durable Medical Equipment, Prosthetics, Orthotics, and Supplies (DMEPOS) items — established under the DMEPOS final rule (often referenced as CMS-6050-F) — rolled out gradually by state starting back in the early-to-mid 2010s, but that phase-in finished years ago. As of 2026, the Required Prior Authorization List applies nationwide to every Medicare Administrative Contractor (MAC) jurisdiction. So if you’re a DME supplier billing Medicare anywhere in the country, you are already subject to this program — there is no state left to “wait for.”
What does change from year to year is the list of HCPCS codes subject to prior authorization, and the broader Master List and Required Face-to-Face Encounter/Written Order Prior to Delivery (F2F/WOPD) List that feed into it. CMS updates these lists periodically through Federal Register notices, typically with about 90 days’ advance notice before a new set of codes becomes subject to prior authorization or F2F/WOPD documentation requirements.
What actually changed in the 2026 update
CMS’s most recent DMEPOS list update took effect April 13, 2026, following the standard 90-day notice period. The update touched all three lists CMS maintains:
- Master List (items potentially subject to face-to-face and prior authorization requirements): 18 HCPCS codes were added — 8 based on updated payment thresholds and fraud/improper-payment data, and 10 based on aberrant billing patterns identified by CMS’s program integrity contractors. No codes were removed. The payment thresholds that determine Master List eligibility were also adjusted for inflation to $602 for purchased items and $61 for monthly rentals.
- Required F2F/WOPD List: 8 HCPCS codes were added, all related to oxygen and oxygen delivery systems.
- Required Prior Authorization List: 7 HCPCS codes were added — 5 orthoses codes and 2 pneumatic compression device codes — bringing the Required PA List to 74 total codes, up from 67.
If your practice or supply company bills any of the oxygen, orthoses, or pneumatic compression device codes, this is the list to check line by line against your current billing setup — a code that wasn’t subject to prior authorization in March 2026 may have required it since April 13.
Don’t confuse this with the WISeR model
Separately, CMS launched the WISeR (Wasteful and Inappropriate Service Reduction) Model on January 1, 2026 — and this one really is state-limited. It currently operates in six states: New Jersey, Ohio, Oklahoma, Texas, Arizona, and Washington. WISeR is a prior-authorization and pre-payment review pilot for traditional (fee-for-service) Medicare, targeting a defined list of services CMS considers prone to overuse or improper billing — categories like skin and tissue substitute applications, implantation of electrical nerve stimulators, and knee arthroscopy for osteoarthritis. It uses technology vendors (with AI/ML-assisted review) to screen requests, but CMS’s own materials specify that non-payment recommendations must be made by licensed clinicians applying standardized, evidence-based criteria.
The reason this matters for a DME-focused billing team: WISeR is not, per CMS’s published service list, primarily a DME initiative — it targets specific procedural and device-implantation services rather than the broad DMEPOS equipment categories. If your practice is in one of the six WISeR states and bills any of its covered service categories, you have a second, separate prior-authorization obligation layered on top of (not instead of) the nationwide DMEPOS program. Practices in the other 44 states have no WISeR obligation at all right now, though CMS has signaled it may expand the model to additional states and services in future performance years.
What to actually do
- Pull the current Required Prior Authorization List and Master List from your MAC’s website (Noridian, CGS, or your applicable jurisdiction contractor) and cross-check it against your top-billed DME HCPCS codes — don’t rely on last year’s list from memory.
- Check whether your practice location falls in one of the six WISeR states and, if so, get the current WISeR covered-service list from the CMS Innovation Center’s operational guide — it is updated periodically and is a completely separate submission and review process from DMEPOS PA.
- Flag oxygen equipment, orthoses, and pneumatic compression devices specifically in your intake and eligibility workflow, since these are the categories directly affected by the April 2026 update.
- Watch for the next Federal Register notice. CMS updates these lists on a recurring basis (historically at least annually), each with a roughly 90-day notice window, so build a recurring calendar reminder to check rather than waiting for a vendor alert.
Suppliers who’ve been through several of these list updates usually say the same thing: the compliance risk isn’t in the big, well-publicized additions — it’s in the code that gets added quietly to the Master List or F2F/WOPD list without triggering a prior-auth requirement yet, but that everyone assumes is still “just documentation.” Treating Master List additions as a heads-up for a probable future PA requirement, not just a paperwork footnote, tends to prevent scrambles later.
Takeaway
The nationwide DMEPOS Required Prior Authorization List grew to 74 codes on April 13, 2026 — that’s the update every DME biller needs to check. WISeR is a separate, genuinely state-limited pilot in six states covering different services entirely, so don’t let one initiative’s headlines distract you from checking the list that actually applies to your equipment codes.