Why 102 Lab Codes Won't Reach Their New Price by 2029

The private payor rates that price every Medicare lab test you billed this morning were collected between January and June of 2016.

Congress delayed the replacement cycle year after year. The reduction cap sat at 0.0% from 2021 straight through 2026.

On Monday afternoon CMS posted the file that ends that. The weighted medians from the January-to-June 2025 collection period are up, along with the raw submissions behind them, and the agency's own framing is that Medicare has been paying about 16% more than commercial payers for identical tests and that closing the gap is worth roughly $1 billion a year.

That framing is accurate. It is also the least operational thing in the release.

The useful part is in the spreadsheet, where CMS publishes a per-code flag for whether a test takes the full statutory reduction next year. On 775 codes, it does. Which means the number that sets your January rate on most of the fee schedule is not the new median at all.

What CMS Actually Put on the Server

Three zips went up on September 21 with timestamps minutes apart: the preliminary weighted medians, the 170 MB record-level file of private payor submissions behind them, and the preliminary determinations for new test codes.

The applicable code list runs 1,947 HCPCS codes. CMS calculated a weighted median for 1,528 of them, which leaves 419 codes that received no private payor data at all and therefore carry their 2026 rate into 2027 untouched.

Of the 1,528, CMS counts 186 medians above the current rate, 169 equal to it, and 1,171 below. Two codes have no 2026 rate to compare against, G0327 and 0541U, and they simply take the median outright at $920.00 and $47.58.

Reporting participation is the part of the fact sheet worth reading twice. 6,411 laboratory NPIs submitted, against 1,942 in the 2017 cycle. Hospital labs went from 21 to 875.

So the 2016 medians were, functionally, a handful of independent labs and some physician offices. This set is the whole industry.