M08.40 – Pauciarticular juvenile rheumatoid arthritis, unspecified site

ICD-10-CM 2027 diagnosis code · Inflammatory polyarthropathies

Billable code

ICD-10-CM code M08.40

Code: M08.40 (claims format: M0840)
Description: Pauciarticular juvenile rheumatoid arthritis, unspecified site
Short description: Pauciarticular juvenile rheumatoid arthritis, unsp site
Billable: Yes – valid for HIPAA-covered transactions
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 › M08.4

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.-)

Index terms for M08.40

Entries in the ICD-10-CM alphabetic index that lead to this code:

Arthritis, arthritic, juvenile, pauciarticular

Related codes in M08.4

Frequently asked questions

What is ICD-10 code M08.40?

M08.40 is the ICD-10-CM code for pauciarticular juvenile rheumatoid arthritis, unspecified site, in the block M05-M14 (Inflammatory polyarthropathies).

Is M08.40 a billable code?

Yes. M08.40 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does M08.40 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.