M21.26
Non-billableFlexion deformity, knee
M21.26 is the ICD-10-CM code for Flexion deformity, knee. It is a non-billable category code — use a more specific child code such as M21.261 for billing.
M00-M99 Diseases of the musculoskeletal system and connective tissue
No additional coding notes for this code.
Frequently asked questions
Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.
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