When CMS changes what Medicare pays: the calendar, and where the decisions get made

On July 16, 2026, CMS published its proposed physician fee schedule for calendar year 2027. The comment period closed on September 14. If a payment change in that rule affects your company and you did not file, your opportunity to shape it through the rulemaking record is gone, and the final rule will arrive in November with the policy substantially as proposed. This is the single most common way organizations without a Washington office lose on a Medicare issue: not by arguing badly, but by arriving after the docket closed.

The good news is that the calendar is fixed, published years in advance, and almost entirely knowable.

The rules move on two clocks

Medicare’s big payment systems run on either a calendar year or a fiscal year, and the difference determines when you have to be ready.

The inpatient prospective payment system runs on the fiscal year and is the only one with a codified schedule: under 42 CFR 412.8, CMS must publish the proposed rule no later than April 1 and the final rule no later than August 1, with rates effective October 1. For FY2027 that ran exactly to form — proposed April 14, 2026 with comments closing June 9, final published August 4, 2026, effective October 1, with a 2.3 percent operating update.

The physician fee schedule and the hospital outpatient system run on the calendar year: proposed in July, final in November, effective January 1. There is no regulation fixing those dates, and recent practice has been later than the old rule of thumb — the CY2026 physician rule was published November 5, 2025 and the outpatient rule November 25.

The 60-day comment period is not a courtesy. Section 1871(b)(1) of the Social Security Act requires the Secretary to provide not less than 60 days for public comment before issuing a Medicare regulation in final form.

Which means the real deadline is not the publication date. It is roughly 60 days after it, and by then everything you intend to say must be in the docket, with the data attached.

Coverage and payment are different problems

Organizations routinely bring a coverage problem to a payment process, or the reverse. They are separate machines.

A national coverage determination is made by CMS and binds the whole program. The statute puts it on a clock: a decision within six months of the request where no external technology assessment is needed, nine months where one is, with a 30-day comment period on the proposed decision and a final decision within 60 days of that period closing. CMS says the real-world process generally runs nine to twelve months.

A local coverage determination is made by a Medicare Administrative Contractor and binds only that contractor’s region. The process lives in Chapter 13 of the Program Integrity Manual: a minimum 45-day comment period, an open public meeting during it, consultation with the Contractor Advisory Committee where applicable, then a minimum 45-day notice period with the policy effective on the 46th day. A contractor has 60 days to decide whether a reconsideration request is even valid, and proposed determinations expire if they are not finalized within a year.

One national decision, or up to seven contractor processes running on their own timetables. That choice is usually made for you by how the item is being reviewed, but knowing which one you are in tells you where to spend.

The code usually comes first

Before coverage and before a rate, there generally has to be a code. HCPCS Level II applications for drugs and biologicals run on four cycles a year; everything else runs on two, with application deadlines on the first business day of January and July and effective dates the following October and April. CMS says it plainly: assignment of a code does not imply coverage by any payer. It is a prerequisite, not an outcome — but a claim without one has nowhere to go.

When the agency cannot fix it

Three routes exist outside the annual rules, and each has a real limit.

The CMS Innovation Center can waive requirements of Titles XI and XVIII to test payment models — genuine authority to do what the payment rules otherwise forbid. But model selection, parameters, termination and expansion are expressly insulated from administrative and judicial review, which means there is no litigation lever and engagement has to be early and technical.

Technical corrections are fast and narrow. CMS issued correcting amendments to the CY2026 physician rule in March 2026, effective on publication, under the good-cause exception, on the express basis that they made no substantive revision. That path fixes an error. It does not reverse a policy.

And some things only statute can do. Benefit categories are set by section 1861 of the Social Security Act; an item outside every listed category cannot be covered by agency action at all. The clearest current illustration is the conversion factor: the 2.50 percent increase for CY2026 came from Public Law 119-21, not from CMS, and its expiry is why CMS proposed CY2027 conversion factors of $33.17 and $32.84, down from $33.57 and $33.40.

What Congress can and cannot do

Medicare jurisdiction sits with the House Committee on Ways and Means and the House Committee on Energy and Commerce, and with the Senate Committee on Finance. A sign-on letter from members of those committees to CMS is worth having and is frequently misunderstood. It does not bind the agency. Courts treat congressional communications in rulemaking with considerable deference, and constituent representation is entirely proper — but the agency’s legal obligation to respond attaches to comments in the docket, not to letters outside it. The letter signals that a policy has political cost. The comment builds the record.

The statutory route runs through the annual extenders, which ride on appropriations bills and continuing resolutions in short increments — three separate vehicles carried Medicare provisions in roughly fourteen months across 2025 and 2026. MedPAC’s March report to Congress each year is where the update recommendations that frame those debates first appear.

What to do with all of this

Work backwards from the publication date, not the comment deadline. Know which of the two clocks your issue is on. Get the code question answered before the coverage question. File in the docket even when a letter feels more satisfying, because only the docket obliges an answer. And put the next proposed rule in your calendar now: the CY2028 physician and outpatient proposals will publish in July 2027, and the FY2028 inpatient proposal by April 1, 2027.

This piece describes how the process works; it is not legal or reimbursement advice. Apollo Counsel represents companies, providers and associations on federal health policy before Congress and CMS.