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ICD-10-CM 2027 diagnosis code

M13Other arthritis

Not billable — use a more specific code

M13 is a header code, so it can't be reported by itself. Choose one of the 3 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M13

M13 is the ICD-10-CM diagnosis code for other arthritis. It belongs to block M05-M14 (inflammatory polyarthropathies) and chapter 13 (diseases of the musculoskeletal system and connective tissue). It is a header code, so it can't be reported by itself; one of its 3 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M13.0 (unspecified), M13.1 (classified) and M13.8 (arthritis).

Don't report M13 together with the conditions in its Excludes1 note: arthrosis (M15-M19) and osteoarthritis (M15-M19).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under M13

Coding notes

Excludes1Not coded here — never report together with this code

Notes that apply from higher levels

Instructions written at a parent level also apply to M13.

Broader instructions also apply from Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about M13

Is M13 billable?

No. M13 is a header code. Report one of its more specific subcodes instead.