All ICD10 Codes
M18Not billable, use a more specific code below

Osteoarthritis of first carpometacarpal joint

In Osteoarthritis (M15-M19), chapter 13: Diseases of the Musculoskeletal System and Connective Tissue

13 billable codes under M18: none are a CC or MCC; none map to an HCC.

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Instructional notes

Also applies, from Osteoarthritis (M15-M19)

These notes sit on M15-M19 and apply to every code under it, including M18.

Excludes2: not included here, code separately if applicable

  • osteoarthritis of spine (M47.-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Covers site and laterality, acute injury versus chronic musculoskeletal conditions, 7th characters for pathologic fractures, osteoporosis with or without current fracture, and multisystem inflammatory syndrome.

Read Section I.C.13 (page 60)

All codes under M18

M18 can't be used on a claim. Pick a billable code below; grey headings group them.

M18 MS-DRGs

As the principal diagnosis, all 13 billable codes under M18 group to MS-DRG 553 or 554 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Osteoarthritis

Osteoarthritis, sometimes called OA, is a type of arthritis that only affects the joints, usually in the hands, knees, hips, neck, and lower back. It's the most common type of arthritis.

Read more about osteoarthritis on MedlinePlus

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.