ICD-10-CM Code M18

Osteoarthritis of first carpometacarpal joint

Version 2020 Non-Billable Code

Not Valid for Submission

M18 is a "header" nonspecific and non-billable code code, consider using a code with a higher level of specificity for a diagnosis of osteoarthritis of first carpometacarpal joint. The code is NOT valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M18
Short Description:Osteoarthritis of first carpometacarpal joint
Long Description:Osteoarthritis of first carpometacarpal joint

Consider the following ICD-10 codes with a higher level of specificity:

  • 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

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Osteoarthritis (M15-M19)
      • Osteoarthritis of first carpometacarpal joint (M18)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Osteoarthritis

Osteoarthritis is the most common form of arthritis. It causes pain, swelling, and reduced motion in your joints. It can occur in any joint, but usually it affects your hands, knees, hips or spine.

Osteoarthritis breaks down the cartilage in your joints. Cartilage is the slippery tissue that covers the ends of bones in a joint. Healthy cartilage absorbs the shock of movement. When you lose cartilage, your bones rub together. Over time, this rubbing can permanently damage the joint.

Risk factors for osteoarthritis include

  • Being overweight
  • Getting older
  • Injuring a joint

No single test can diagnose osteoarthritis. Most doctors use several methods, including medical history, a physical exam, x-rays, or lab tests.

Treatments include exercise, medicines, and sometimes surgery.

NIH: National Institute of Arthritis and Musculoskeletal and Skin Diseases


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