M21.2Non-Billable (Header)Flexion deformityChild CodesM21.20Flexion deformity, unspecified siteM21.21Flexion deformity, shoulderM21.22Flexion deformity, elbowM21.23Flexion deformity, wristM21.24Flexion deformity, finger jointsM21.25Flexion deformity, hipM21.26Flexion deformity, kneeM21.27Flexion deformity, ankle and toesCode Hierarchy└M21Other acquired deformities of limbs└M21.2Flexion deformity└M21.2Flexion deformity