Ten Medicare J-Codes Went Invalid on October 1. Several Replacements Bill in Smaller Units.

CMS's quarterly update to the Medicare Physician Fee Schedule Database (MPFSDB) for October 2026 was issued on August 27 as Transmittal 13929, Change Request 14588. Contractors implemented it on October 5, 2026. Most lines in the attachment carry an effective date of October 1, 2026.

For practices that give drugs in the office, one group of lines matters most. Ten J-codes moved to status indicator I on October 1. In the fee schedule files, status I means the code is not valid for Medicare and another code is used to report the service. The same attachment adds new codes for the same drugs, and several of them are defined in a smaller dose.

The ten codes that are no longer valid for Medicare

The attachment lists these codes as deleted, with status I and an effective date of October 1, 2026:

• J0640 (leucovorin calcium)
• J1941 (Furoscix, 20 mg in the short descriptor)
• J1953 (levetiracetam)
• J7514 (mycophenolate, Myhibbin, 100 mg in the short descriptor)
• J7517, J7519 and J7528 (mycophenolate mofetil, oral, injection and suspension)
• J9181 (etoposide)
• J9190 (fluorouracil)
• J9352 (trabectedin, 0.1 mg in the short descriptor)

New codes for these drugs appear in the same file, all with status E and an effective date of October 1: J0643 and J0644 for leucovorin; J1946 and J1947 for furosemide products; J1957 and J1958 for levetiracetam; J7524, J7526, J7529 and J7530 for mycophenolate; J9186 and J9187 for etoposide; J9191 and J9192 for fluorouracil; and J9362 for trabectedin. Status E means the code is paid outside the physician fee schedule. For Part B drugs, the payment amount comes from the quarterly Average Sales Price (ASP) pricing files.

Use the HCPCS long descriptors and the October ASP file to match each old code to its replacement. The short descriptors in the transmittal are abbreviations, not the full code definition.

Why the units on the claim have to change

A drug code is billed in multiples of the dose in its descriptor. When the dose in the descriptor gets smaller, the number of units for the same administered dose gets larger. Three pairs show this directly in the short descriptors CMS published:

• J1941 was 20 mg; J1947 is 1 mg. The same dose is 20 times as many units.
• J7514 was 100 mg; J7530 is 5 mg. The same dose is 20 times as many units.
• J9352 was 0.1 mg; J9362 is 0.01 mg. The same dose is 10 times as many units.

If a charge master or drug-administration template only swaps the code and keeps the old unit math, the claim will be underbilled. The opposite error, unit counts that look too high for the old code, can trip medically unlikely edits or a payer review. Check the units against the full descriptor of each new code, and confirm the NDC quantity on the claim still matches.

Two dates in the same update

Not every line starts on October 1. The attachment gives laboratory code 87638 an effective date of May 15, 2026. The change request also restates two standard instructions. Contractors shall not search their files to retract payment or to pay claims retroactively, but they shall adjust claims brought to their attention. And contractors give providers 30 days' notice before putting the changes in place.

The update also adds Category III codes 1054T through 1111T (with 1080T among them) as contractor-priced, status C, and six skin substitute and wound product codes (A2046, A2047, A2049, Q4207, Q4223 and Q4243) as active, status A, with a non-facility practice expense RVU of 3.81. Practices that use any of these should read the attachment line by line.

A short check for practices that bill office drugs

A focused review usually covers the risk:

• Search the charge master, EHR order sets and superbills for the ten deleted codes and retire them for dates of service on or after October 1, 2026.
• Map each to its replacement using the HCPCS long descriptor, not the short descriptor, and record the new billing unit next to it.
• Recalculate units on the templates for every common dose, and test one claim per drug before releasing a batch.
• Check the October 2026 ASP pricing file for each new code, and ask your billing system vendor which ASP and fee schedule files are loaded.
• Hold claims from October 1 to now that used a deleted code and correct them before they deny, or track any denials with a log that has no patient identifiers.
• Commercial and Medicaid plans adopt HCPCS changes on their own schedules. Confirm each major payer's policy before changing their claims.

None of this decides whether a particular claim is covered. Coverage, documentation and payer policy still apply.

Make the quarterly file part of the routine

Drug codes change every quarter, and the cost of a missed unit change is quiet: claims pay, just for less than they should. VOSKPO helps practices check each quarterly update against the drugs they actually give, with human review before claims go out. A revenue review can show where a code change touches a practice's own claims.