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M18.5

Non-billable

Other unilateral secondary osteoarthritis of first carpometacarpal joint

M18.5 is the ICD-10-CM code for Other unilateral secondary osteoarthritis of first carpometacarpal joint. It is a non-billable category code — use a more specific child code such as M18.50 for billing.

Status
Header (non-billable)
Chapter
M00-M99
Parent
M18
Subcodes
3
Edition
FY2026

M00-M99 Diseases of the musculoskeletal system and connective tissue

Includes

  • •Secondary osteoarthritis of first carpometacarpal joint NOS

Frequently asked questions

What is ICD-10 code M18.5?
M18.5 is the ICD-10-CM code for "Other unilateral secondary osteoarthritis of first carpometacarpal joint". It falls under M00-M99 Diseases of the musculoskeletal system and connective tissue.
Is M18.5 a billable code?
No — M18.5 is a non-billable header code. Use a more specific child code (such as M18.50) for billing.
What are the subcodes of M18.5?
M18.5 has 3 more specific child codes, including M18.50, M18.51, M18.52.

Source: CMS ICD-10-CM FY2026. For informational purposes only — not medical advice. See our medical disclaimer.

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