ICD-10-CM > M00-M99 > M20-M25 > M25 > M25.6 > M25.65 M25.65 Stiffness of hip, not elsewhere classified Non-Billable/Non-Specific Codes M25.651Stiffness of right hip, not elsewhere classifiedM25.652Stiffness of left hip, not elsewhere classifiedM25.659Stiffness of unspecified hip, not elsewhere classified