ICD-10-CM > M00-M99 > M86-M90 > M89 > M89.4 > M89.43 M89.43 Other hypertrophic osteoarthropathy, forearm Non-Billable/Non-Specific Codes M89.431Other hypertrophic osteoarthropathy, right forearmM89.432Other hypertrophic osteoarthropathy, left forearmM89.439Other hypertrophic osteoarthropathy, unspecified forearm