ICD-10-CM M18: Osteoarthritis of first carpometacarpal joint

ICD-10-CM Diagnosis Code (2025)

Official Description for M18

Osteoarthritis of first carpometacarpal joint

Coding Notes & Guidelines for M18

Inclusion Terms

Primary osteoarthritis of first carpometacarpal joint NOS

Inclusion Terms

Post-traumatic osteoarthritis of first carpometacarpal joint NOS

Inclusion Terms

Secondary osteoarthritis of first carpometacarpal joint NOS

Child Codes (More Specific Codes for M18):

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 M18.32 - Unilateral post-traumatic osteoarthritis of first carpometacarpal joint, left 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

About ICD-10-CM Code M18 (Osteoarthritis of first carpometacarpal joint)

ICD-10-CM code M18 is a billable or specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. The 2025 edition of ICD-10-CM M18 became effective on October 1, 2024.

This page provides detailed information about M18 - Osteoarthritis of first carpometacarpal joint. It includes common terminology, coding guidelines such as "Includes," "Excludes1," and "Excludes2" notes, and information on required 7th characters. Utilizing this information correctly is essential for accurate medical coding and claims submission for conditions like Osteoarthritis of first carpometacarpal joint.