The simple version

The program keeps what it calls a Master List of home items. Landing on that roster means an item has been flagged as worth watching, nothing more.

Two narrower rosters are drawn out of it. One makes an appointment with a clinician and a written order a condition before handover, and the other makes a sign-off in advance a condition of getting paid at all.

So the question is never whether an item sits on the big roster. It is whether it has been picked out onto one of the narrow ones and announced.

The numbers

• Centers for Medicare and Medicaid Services rule, Medicare Program; Updates to the Master List of Items Potentially Subject to Face-to-Face Encounter and Written Order Prior to Delivery and/or Prior Authorization Requirements, 42 CFR parts 410 and 414, citation 91 FR 47972, published July 30, 2026 (Federal Register document 2026-15446)
• Implementation of the updates to the Master List, the Required Face-to-Face Encounter and Written Order Prior to Delivery List, and the Required Prior Authorization List, excluding upper limb orthoses, is effective October 28, 2026 (same document, DATES)
• The document describes the Master List as a library of items that have been identified as potential vulnerabilities to the Trust Fund (same document)
• The document states that only those items that are selected and announced via Federal Register notice are subject to such regulatory conditions of payment (same document)
• The document states that Master List criteria are outlined in 42 CFR 414.234(b), and that the two narrower lists rest on the authority in sections 1834(a)(1)(E)(iv), 1834(a)(11)(B) and 1834(a)(15) of the Social Security Act (same document)
• The Required Prior Authorization List specified in 42 CFR 414.234(c)(1) is selected from the Master List, and those selected items require prior authorization as a condition of payment (same document)
• A criterion for Master List inclusion is an average purchase fee of $500 or greater, adjusted annually for inflation (same document)
• For calendar year 2026 the adjusted purchase price threshold is $614 and the adjusted monthly rental fee threshold is $62 (same document)
• Prior authorization for upper limb orthoses is implemented in three phases rather than all at once (same document, DATES)
• Phase one covers New York, Michigan, Florida and California and is effective October 28, 2026 (same document)
• Phase two covers the phase one states plus Pennsylvania, Massachusetts, Ohio, Illinois, Texas, Georgia, Arizona and Oregon, and is effective January 26, 2027 (same document)
• Phase three covers all remaining states and territories and is effective April 26, 2027 (same document)

Three rosters, not one

The big roster is a watchlist. The document calls it a library of items flagged as weak points for the Trust Fund, which is a statement about spending risk rather than about anyone's need.

The first narrow roster adds paperwork before handover: an appointment with a clinician and a written order have to exist first. The second adds a sign-off in advance, and there the consequence is payment itself.

The line between the big roster and the narrow ones is an announcement. A pick has to be published before anything attaches, which is why reading the big roster alone tells you nothing about your own item.

One category breaks the pattern on timing. For upper limb braces the requirement arrives in three waves, so the same item can carry a sign-off requirement in one state months before it does in another.

The actual math behind getting on the roster

There is a money test for landing on the watchlist, and it is published. An item qualifies at an average purchase fee of $500 or greater, and that figure is adjusted each year.

The adjustment matters more than the headline number. For 2026 the adjusted purchase threshold is $614, and the monthly rental threshold is $62.

So the $500 in the rule is a base rather than a current cutoff, and anyone comparing an item's price against $500 is using a stale figure. The 2026 numbers are the ones in force.

These thresholds decide candidacy for the watchlist only. They do not decide whether an item needs a sign-off, which still turns on being picked and announced.

What this means

If someone tells you an item needs approval because it is on Medicare's list, the follow-up question is which list. Only the narrow selected rosters carry a requirement, and only after they are published.

Two different consequences are also worth keeping apart. A missing written order is a delivery problem, while a missing advance approval is a payment problem, and the second is the one that leaves a bill behind.

And for braces, where you live changes the answer this year. Four states started in October, eight more join in January, and everywhere else follows in April.

What this is NOT

This article explains the difference between Medicare's Master List and the narrower selected rosters that carry requirements, using the rule Medicare Program; Updates to the Master List of Items Potentially Subject to Face-to-Face Encounter and Written Order Prior to Delivery and/or Prior Authorization Requirements, 42 CFR parts 410 and 414, citation 91 FR 47972, published July 30, 2026, read on October 19, 2026. It is not medical advice and it is not advice about any treatment, device or supplier. It makes no statement about whether any particular item, code or person is on any roster, is covered, or requires anything, because that turns on the published selections and on facts this article does not have. It does not reproduce any of the rosters or any Healthcare Common Procedure Coding System codes, and it should not be used to look up an item. It is not a claim about what Medicare will pay for anything, and it predicts no coverage outcome. Every figure here is the document's own and nothing is computed: the dollar thresholds govern candidacy for the watchlist and not coverage of anybody's item. Medicare is a public program rather than an employee benefit, so nothing here describes any employer's plan or obligations. It is not legal advice about appealing any decision. It does not name the officials who signed or are listed in the document. This is not a political endorsement or criticism of anyone.

Sources

• Centers for Medicare and Medicaid Services, Medicare Program; Updates to the Master List of Items Potentially Subject to Face-to-Face Encounter and Written Order Prior to Delivery and/or Prior Authorization Requirements; Updates to the Required Face-to-Face Encounter and Written Order Prior to Delivery List; and Updates to the Required Prior Authorization List, 42 CFR parts 410 and 414, citation 91 FR 47972, published July 30, 2026, implementation effective October 28, 2026, read October 19, 2026: https://www.federalregister.gov/documents/2026/07/30/2026-15446/medicare-program-updates-to-the-master-list-of-items-potentially-subject-to-face-to-face-encounter