10 FY 2027 ICD-10 changes that will bounce your claims on Oct. 1

A sprain code that has sat on orthopedic superbills since the ICD-10 transition in 2015 stops working on Oct. 1. So does the whole family of codes practices have used for organic solvent poisoning. And the code most outpatient practices have leaned on for the most common cause of heel pain is being replaced by three codes that demand something the old one never did: a side.

CMS and the CDC's National Center for Health Statistics released the FY 2027 ICD-10-CM code set in June, adding 190 new diagnosis codes, deleting 30 and revising four for encounters on or after Oct. 1, 2026. It is a lighter update than some recent years by raw count, which is exactly why it is dangerous. A small update invites practices to skip the prep work, and the changes that did land sit in high-volume, everyday coding: shoulders, feet, bones and hearts.

There is no grace period. Code selection follows date of service for outpatient claims and date of discharge for inpatient, and because ICD-10-CM binds every HIPAA-covered entity, the change hits commercial payers, Medicaid managed care plans and workers' compensation carriers on the same morning it hits Medicare. Here are 10 places to spend the time you have left.