12 new ICD-10 codes worth adding to your pick list before Oct. 1

Of the 190 diagnosis codes taking effect Oct. 1, plenty will never touch an outpatient claim. Sixty of them describe toxic effects from industrial solvents and the veterinary sedative medetomidine. Another 28 track a continuing pregnancy after vanishing twin syndrome by trimester and fetus.

But the FY 2027 code files from the National Center for Health Statistics also carry a set of codes that let physicians say what they already know about a patient. A cardiologist can separate a genetic dilated cardiomyopathy from one with no known cause. A primary care physician can put a prior C. diff infection on the claim instead of burying it in a free-text note. And a few old catchall codes, including I42.0, M72.2 and Z68.1, stop being valid when the new code set takes effect, one of several FY 2027 changes that can bounce claims starting Oct. 1.

Nobody needs to memorize all 190. Practices need to find the handful their physicians will reach for, load them into EHR favorites and templates and make sure the notes carry the detail each code requires. Here are 12 worth starting with.