M18.3
⚠ Non-billable (Header)Unilateral post-traumatic osteoarthritis of first carpometacarpal joint
Diseases of the musculoskeletal system and connective tissue (M00-M99)
⚠️ This is a category header code — not billable. Use a more specific child code below.
Also Known As
Child Codes (3)
Clinical Description
ICD-10-CM code M18.3 represents unilateral post-traumatic osteoarthritis of first carpometacarpal joint. This code falls under the Diseases of the musculoskeletal system and connective tissue (M00-M99) classification. It is a non-billable category header code. A more specific child code from the list below must be used for billing and reimbursement purposes.
This is a 5-character code at the 4th level of specificity. There are 3 more specific child codes under M18.3.
Frequently Asked Questions
What is ICD-10 code M18.3?
ICD-10-CM code M18.3 is "Unilateral post-traumatic osteoarthritis of first carpometacarpal joint". It belongs to the category: Diseases of the musculoskeletal system and connective tissue (M00-M99).
Is M18.3 a billable ICD-10 code?
No, M18.3 is a non-billable header code. A more specific child code must be used for billing.
Related Codes in M18
Other codes in the same category that may be relevant for differential coding:
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Data Source
CMS ICD-10-CM 2026 Tabular List
Updated October 1, 2025 (FY2026)