ICD-10 Guide

M18

Name: ICD-10-CM Medical Diagnosis Codes
Creator: Centers for Medicare & Medicaid Services
License: https://www.cms.gov/medicare/coding/icd10

Non-billable

Osteoarthritis of first carpometacarpal joint

Chapter 13:Diseases of the musculoskeletal system

BILLABLE STATUSNo

IMPLEMENTATION DATEOctober 1, 2015

LAST UPDATED08/26/2025

Code Description

ICD-10 M18 is a used to indicate a diagnosis of osteoarthritis of first carpometacarpal joint.

Key Diagnostic Point:

Osteoarthritis of first carpometacarpal joint