ICD-10-CM > M00-M99 > M20-M25 > M21 > M21.2 > M21.21 M21.21 Flexion deformity, shoulder Non-Billable/Non-Specific Codes M21.211Flexion deformity, right shoulderM21.212Flexion deformity, left shoulderM21.219Flexion deformity, unspecified shoulder