ICD-10-CM 2027
ICD-10 code for reactive arthropathy
From the official ICD-10-CM alphabetic index entry “Arthropathy › reactive”. Page updated September 29, 2026.
About coding reactive arthropathy
The ICD-10-CM code for reactive arthropathy is M02.9 (Reactive arthropathy, unspecified). The official index lists 12 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on M02.9.
Within M02, choose M02.9 (Reactive arthropathy, unspecified) only when documentation doesn't support a more specific option: arthropathy following intestinal bypass (M02.0), Postdysenteric arthropathy (M02.1), Postimmunization arthropathy (M02.2), Reiter's disease (M02.3) and other reactive arthropathies (M02.8).
Code first underlying disease, such as: congenital syphilis [Clutton's joints] (A50.5), enteritis due to Yersinia enterocolitica (A04.6), infective endocarditis (I33.0) and viral hepatitis (B15-B19).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
More specific reactive arthropathy codes (official index)
- in (due to)
- infective endocarditis I33.0 — Acute and subacute infective endocarditis
- specified type NEC M02.80 — Other reactive arthropathies, unspecified site
- ankle M02.87 — Other reactive arthropathies, ankle and foot
- elbow M02.82 — Other reactive arthropathies, elbow
- foot joint M02.87 — Other reactive arthropathies, ankle and foot
- hand joint M02.84 — Other reactive arthropathies, hand
- hip M02.85 — Other reactive arthropathies, hip
- knee M02.86 — Other reactive arthropathies, knee
- multiple site M02.89 — Other reactive arthropathies, multiple sites
- shoulder M02.81 — Other reactive arthropathies, shoulder
- vertebra M02.88 — Other reactive arthropathies, vertebrae
- wrist M02.83 — Other reactive arthropathies, wrist
Common questions about reactive arthropathy ICD-10 codes
What is the ICD-10 code for reactive arthropathy?
- M02.9 — Reactive arthropathy, unspecified. More specific codes apply when the documentation supports them: I33.0, M02.80, M02.87, M02.82 and others below.
Is M02.9 billable?
- Yes. M02.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can M02.9 be used as a principal diagnosis?
- No. It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.
Is M02.9 a CC or MCC?
- No. M02.9 is neither a CC nor an MCC under MS-DRG v44.0.