M08.40

HCC Category Mapping

What This Code Means

A type of childhood arthritis affecting only a few joints (typically four or fewer) when the specific joint location is not documented.

Coding Tips

• •Pauciarticular means involvement of 1-4 joints; verify this criterion is met
• •Query provider if specific joint sites are documented to allow assignment of more specific codes (M08.41-M08.4A)

Clinical Significance

Pauciarticular juvenile rheumatoid arthritis represents a milder form of childhood arthritis affecting four or fewer joints, but still requires careful monitoring and management. This diagnosis is significant for risk adjustment as it indicates chronic inflammatory disease requiring ongoing rheumatologic care, physical therapy, and monitoring for complications such as chronic iridocyclitis.

Documentation Requirements

• ✓Patient age at onset (must be under 16 years)
• ✓Involvement of 4 or fewer joints throughout disease course
• ✓Documentation that joint location is unspecified or not clearly identified
• ✓Absence of systemic symptoms (fever, rash, organomegaly)
• ✓Duration of symptoms (minimum 6 weeks for JRA diagnosis)
• ✓Physical examination findings of joint inflammation
• ✓Laboratory studies excluding other causes of arthritis
• ✓Ophthalmologic screening results due to iridocyclitis risk

Commonly Confused Codes