ICD-10-CM 2027 diagnosis code

M08Juvenile arthritis

Not billable — use a more specific code

M08 is a header code, so it can't be reported by itself. Choose one of the 7 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 M08

M08 is the ICD-10-CM diagnosis code for juvenile 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 7 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: M08.0 (arthritis), M08.1 (spondylitis), M08.2 (onset), M08.3 ((seronegative)), M08.4 (arthritis), M08.8 (arthritis) and M08.9 (unspecified).

Don't report M08 together with the conditions in its Excludes1 note: arthropathy in Whipple's disease (M14.8), Felty's syndrome (M05.0), juvenile dermatomyositis (M33.0-) and psoriatic juvenile arthropathy (L40.54).

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 M08

Coding notes

Excludes1Not coded here — never report together with this code

arthropathy in Whipple's disease (M14.8)
Felty's syndrome (M05.0)
juvenile dermatomyositis (M33.0-)
psoriatic juvenile arthropathy (L40.54)

Code alsoTwo codes may be needed; sequencing depends on circumstances

any associated underlying condition, such as:
regional enteritis [Crohn's disease] (K50.-)
ulcerative colitis (K51.-)

Notes that apply from higher levels

Instructions written at a parent level also apply to M08.

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

Codes whose notes reference M08

M05Excludes1

Code history

2016
2017
2018
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 M08

Is M08 billable?: No. M08 is a header code. Report one of its more specific subcodes instead.