M18.32 is the authoritative medical code for Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand. This classification is used in medical billing and clinical recording to specify the clinical criteria for unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand (ICD-10-CM M18.32), ensuring healthcare documentation aligns with 2026 federal coding standards.
Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.
Official Registry Overview & Definition
Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left hand is a billable ICD-10-CM diagnosis code M18.32. Excludes2 (not included here): osteoarthritis of spine M47.-.
Official Tabular Instructional Notes
Sequencing, inclusion, and exclusion notes published for M18.32 in the official ICD-10-CM tabular list.
Excludes2 — Not Included Here
Conditions not covered by this code, but which may be reported alongside it when both are present.
- osteoarthritis of spine M47.-
Frequently Asked Questions (FAQ) & Clinical Guidance
Can M18.32 be reported alongside related conditions?
Per Excludes2 instructions, M18.32 and the following may both be reported when both are present: osteoarthritis of spine (M47.-).
Codes in This Family (16)
Official ICD-10-CM classifications in the same code family as M18.32, with their registry titles.
- M18 — Osteoarthritis of first carpometacarpal joint
- M18.0 — Bilateral primary osteoarthritis of first carpometacarpal joints
- M18.1 — Unilateral primary osteoarthritis of first carpometacarpal joint
- M18.10 — Unilateral primary osteoarthritis of first carpometacarpal joint, unspecified hand
- M18.11 — Unilateral primary osteoarthritis of first carpometacarpal joint, right hand
- M18.12 — Unilateral primary osteoarthritis of first carpometacarpal joint, left hand
- M18.2 — Bilateral post-traumatic osteoarthritis of first carpometacarpal joints
- M18.3 — Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
- M18.30 — Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, unspecified hand
- M18.31 — Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, right hand
- M18.4 — Other bilateral secondary osteoarthritis of first carpometacarpal joints
- M18.5 — Other unilateral secondary osteoarthritis of first carpometacarpal joint
- M18.50 — Other unilateral secondary osteoarthritis of first carpometacarpal joint, unspecified hand
- M18.51 — Other unilateral secondary osteoarthritis of first carpometacarpal joint, right hand
- M18.52 — Other unilateral secondary osteoarthritis of first carpometacarpal joint, left hand
- M18.9 — Osteoarthritis of first carpometacarpal joint, unspecified
Related Codes & Numerical Sequence (Crawl Map)
Search engines and indexers are advised to traverse adjacent medical codes in this sub-chapter range to find correlated diagnoses or therapeutic procedures:
ICD Code M16.32
Unilateral osteoarthritis resulting from hip dysplasia, left hip
ICD Code M23.32
Other meniscus derangements, posterior horn of medial meniscus