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ICD-10-CM 2027 diagnosis code

M26.64Arthritis of temporomandibular joint

Not billable — use a more specific code

M26.64 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code last changed in FY2021 (effective October 1, 2020). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About M26.64

M26.64 is the ICD-10-CM diagnosis code for arthritis of temporomandibular joint. It belongs to category M26 (dentofacial anomalies [including malocclusion]), block M26-M27 (dentofacial anomalies [including malocclusion] and other disorders of jaw) 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 4 subcodes must be used instead.

Within M26.6 (temporomandibular joint disorders), M26.64 is specifically for arthritis of temporomandibular joint. Related codes cover temporomandibular joint disorder, unspecified (M26.60), adhesions and ankylosis of temporomandibular joint (M26.61), arthralgia of temporomandibular joint (M26.62), articular disc disorder of temporomandibular joint (M26.63), arthropathy of temporomandibular joint (M26.65) and other specified disorders of temporomandibular joint (M26.69).

To report this condition, pick the subcode that matches the documentation: M26.641 (joint), M26.642 (joint), M26.643 (joint) and M26.649 (joint).

It was added in FY2021, effective October 1, 2020.

Specific codes under M26.64

Notes that apply from higher levels

Instructions written at a parent level also apply to M26.64.

› From M26.6 Temporomandibular joint disorders
Excludes2
  • current temporomandibular joint dislocation (S03.0)
  • current temporomandibular joint sprain (S03.4)

Broader instructions also apply from M26-M27 Dentofacial anomalies [including malocclusion] and other disorders of jaw and 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 M26.64.

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
  • FY2021 (effective 10/1/2020): Added
  • No changes since FY2021.

Common questions about M26.64

Is M26.64 billable?

No. M26.64 is a header code. Report one of its more specific subcodes instead.