M08.4 – Pauciarticular juvenile rheumatoid arthritis

ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies

Non-billable header

ICD-10-CM code M08.4

Code: M08.4 (claims format: M084)
Description: Pauciarticular juvenile rheumatoid arthritis
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 13. Diseases of the musculoskeletal system and connective tissue (M00-M99)
Block: M05-M14 Inflammatory polyarthropathies
Parent codes: M08

Billable codes under M08.4

M08.4 is a header code and cannot be used on claims. Choose the most specific code:

M08.40 – Pauciarticular juvenile rheumatoid arthritis, unspecified siteBillable
M08.41 – Pauciarticular juvenile rheumatoid arthritis, shoulderHeader (more codes below)
M08.42 – Pauciarticular juvenile rheumatoid arthritis, elbowHeader (more codes below)
M08.43 – Pauciarticular juvenile rheumatoid arthritis, wristHeader (more codes below)
M08.44 – Pauciarticular juvenile rheumatoid arthritis, handHeader (more codes below)
M08.45 – Pauciarticular juvenile rheumatoid arthritis, hipHeader (more codes below)
M08.46 – Pauciarticular juvenile rheumatoid arthritis, kneeHeader (more codes below)
M08.47 – Pauciarticular juvenile rheumatoid arthritis, ankle and footHeader (more codes below)
M08.48 – Pauciarticular juvenile rheumatoid arthritis, vertebraeBillable
M08.4A – Pauciarticular juvenile rheumatoid arthritis, other specified siteBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

M08 – Juvenile arthritis

Excludes1 (not coded here):

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

Code also:

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

Related codes in M08

Frequently asked questions

What is ICD-10 code M08.4?

M08.4 is the ICD-10-CM code for pauciarticular juvenile rheumatoid arthritis, in the block M05-M14 (Inflammatory polyarthropathies).

Is M08.4 a billable code?

No. M08.4 is a header code with more specific child codes; report one of the billable codes listed above.

What category does M08.4 belong to?

It belongs to category M08 – Juvenile arthritis.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.