How a Date on a Demand Letter Prices Your Appeal
Treasury's certified rate for Medicare overpayments holds at 11.875 percent on October 21, the first quarter in six that it hasn't moved and the highest of the six. The rate is fixed by the date your determination is written, not the date you pay, and it accrues straight through the appeal. Also in the window: CMS pushed its own terminated-provider collections cascade back 56 days, a MolDX coverage family retired and was replaced overnight, and a Federal Register notice published this morning carries the wrong collection title.
Every quarter Treasury certifies a private consumer rate, and CMS writes it into a transmittal telling the MACs what to charge you on money Medicare says you owe.
Thursday afternoon CMS issued that transmittal. The rate did not move.
11.875 percent, effective October 21, the same number that took effect on July 21. Across the six quarterly notices since July 2025 that is the only repeat, and it is the top of the range (chart below).
"Which day's rate rides your overpayment all the way through the appeal?"
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The impact tables, the code-level detail, and the rest of the analysis sit past this line.
$50 a month, or $500 a year.
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