ICD-10-CM 2027 diagnosis code

M19.9Osteoarthritis, unspecified site

Not billable — use a more specific code

M19.9 is a header code, so it can't be reported by itself. Choose one of the 4 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 M19.9

M19.9 is the ICD-10-CM diagnosis code for osteoarthritis, unspecified site. It belongs to category M19 (other and unspecified osteoarthritis), block M15-M19 (osteoarthritis) 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 M19, choose M19.9 (Osteoarthritis, unspecified site) only when documentation doesn't support a more specific option: primary osteoarthritis of other joints (M19.0), post-traumatic osteoarthritis of other joints (M19.1) and secondary osteoarthritis of other joints (M19.2).

To report this condition, pick the subcode that matches the documentation: M19.90 (site), M19.91 (site), M19.92 (site) and M19.93 (site).

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 M19.9

Notes that apply from higher levels

Instructions written at a parent level also apply to M19.9.

› From M19 Other and unspecified osteoarthritis

Excludes1

polyarthritis (M15.-)

Excludes2

arthrosis of spine (M47.-)
hallux rigidus (M20.2)
osteoarthritis of spine (M47.-)

Broader instructions also apply from M15-M19 Osteoarthritis and Chapter 13: Diseases of the musculoskeletal system and connective tissue.

Code history

2016
2017
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2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about M19.9

Is M19.9 billable?: No. M19.9 is a header code. Report one of its more specific subcodes instead.