Osteoarthritis of first carpometacarpal joint
Osteoarthritis of first carpometacarpal joint
M18 is a header (parent) code in the ICD-10-CM hierarchy. It is not billable for claim submission. Use one of the billable child codes listed below.
Billable codes in this category
Each of the codes below is billable. Choose the one that most accurately describes the patient's diagnosis.
M18.0 identifies degenerative joint disease of the first carpometacarpal (CMC) joint — the thumb basal joint — affecting both hands, with no traumatic or secondary cause documented.
Post-traumatic osteoarthritis affecting the first carpometacarpal (CMC1) joint on both the right and left hands, where prior injury is the documented cause of joint degeneration.
Degenerative joint disease of both thumb basal joints (the first carpometacarpal joints, bilaterally) caused by a secondary etiology other than post-traumatic injury — such as inflammatory arthritis, crystal deposition, or metabolic joint disease.
Degenerative joint disease of the first carpometacarpal (CMC) joint — the basal thumb joint where the first metacarpal articulates with the trapezium — without specification of laterality, etiology (primary vs. secondary), or whether one or both sides are affected.