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ICD-10-CM 2027 diagnosis code

M13.8Other specified arthritis

Not billable — use a more specific code

M13.8 is a header code, so it can't be reported by itself. Choose one of the 10 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 M13.8

M13.8 is the ICD-10-CM diagnosis code for other specified arthritis. It belongs to category M13 (other arthritis), 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 10 subcodes must be used instead.

Within M13, choose M13.8 (Other specified arthritis) only when documentation doesn't support a more specific option: polyarthritis, unspecified (M13.0) and monoarthritis, not elsewhere classified (M13.1).

To report this condition, pick the subcode that matches the documentation: M13.80 (unspecified site), M13.81 (shoulder), M13.82 (elbow), M13.83 (wrist), M13.84 (hand), M13.85 (hip), M13.86 (knee), M13.87 (ankle and foot) and 2 more.

Don't report M13.8 together with the conditions in its Excludes1 note: 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 M13.8

Coding notes

Applicable toConditions and synonyms classified to this code
  • Allergic arthritis
Excludes1Not coded here — never report together with this code

Notes that apply from higher levels

Instructions written at a parent level also apply to M13.8.

› From M13 Other arthritis
Excludes1

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

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to M13.8.

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 M13.8

Is M13.8 billable?

No. M13.8 is a header code. Report one of its more specific subcodes instead.