Postdysenteric arthropathy at an unspecified anatomical site — joint inflammation arising after a dysenteric illness when the specific joint involved is not documented.

Documentation tips

What should appear in the chart to support M02.10.

Source · Editorial brief grounded in 4 cited references ↓

• Document the specific joint(s) involved by name and laterality — if the knee is affected, record right or left, allowing upgrade to a site-specific M02.1x code.
• Identify and code the preceding dysenteric illness separately (e.g., the causative Shigella, Salmonella, or Campylobacter infection) per M02 category 'use additional code' instructions.
• Record onset timing relative to the GI illness — confirming the arthropathy followed the dysenteric episode supports medical necessity and distinguishes this from primary inflammatory arthritis.
• Note any laboratory or synovial fluid findings that confirm reactive rather than septic arthritis (negative culture, elevated inflammatory markers) to defend against audit queries.
• If imaging was obtained, document the joint(s) imaged and findings (effusion, synovitis, no cartilage loss) to substantiate the reactive diagnosis.

Related CPT procedures

Procedure codes commonly billed with M02.10. Linking the right diagnosis to the right procedure is what establishes medical necessity.

Source · CMS LCDs · AAOS specialty guidance · claims-pattern analysis

Common coding pitfalls

The recurring mistakes coders make with M02.10 and adjacent codes.

Source · Editorial brief grounded in CDC ICD-10-CM tabular guidance, AAOS coding references, and cited references ↓

• Using M02.10 when the joint is documented: if the provider names the joint and side, the site-specific 5th/6th-character code is required — M02.10 is not acceptable at that level of detail.
• Failing to add a code for the underlying dysenteric infection: M02 category instructions require coding the triggering infectious disease separately; omitting it is an audit risk.
• Confusing postdysenteric arthropathy with direct septic arthritis: if the organism is still present in the joint, codes from M00–M01 apply, not M02.10.
• Applying M02.10 to arthritis triggered by non-dysenteric infections (e.g., chlamydial urethritis-related reactive arthritis): those map to M02.30x (Reiter's disease) or other M02 subcategories, not M02.1x.
• Coding M02.10 without reviewing Excludes1 notes at the M02 level — conditions such as rubella arthritis (B06.82) or postmeningococcal arthritis (A39.84) have their own codes and must not be coded here.

Clinical context

Source · Editorial summary grounded in 4 cited references ↓

Sibling codes

Other billable codes under M02.1 (laterality / anatomic variants).