ICD-10-CM FY2027 diagnosis code

M21.26: Flexion deformity, knee

Header code: not billableValid for dates of service October 1, 2026 to September 30, 2027

M21.26 groups related diagnoses under flexion deformity, knee. It cannot be used on a claim by itself. Choose the billable code below that matches the patient's record.

Billable codes under M21.26

M21.261Flexion deformity, right knee
M21.262Flexion deformity, left knee
M21.269Flexion deformity, unspecified knee

Other codes in M21.2 Flexion deformity

M21.20Flexion deformity, unspecified site
M21.21Flexion deformity, shoulderheader
M21.22Flexion deformity, elbowheader
M21.23Flexion deformity, wristheader
M21.24Flexion deformity, finger jointsheader
M21.25Flexion deformity, hipheader
M21.27Flexion deformity, ankle and toesheader

M21.26 questions

Is M21.26 a billable code?

No. M21.26 is a header code that groups 3 more specific codes. Use one of the billable codes listed on this page instead.

What does M21.26 mean?

M21.26 is the ICD-10-CM code for Flexion deformity, knee. It is in chapter 13, Diseases of the musculoskeletal system and connective tissue (M00-M99).

Code titles come from the official ICD-10-CM files published by the CDC National Center for Health Statistics. Always check payer rules and the clinical record before billing.