ICD-10 Code M02.161 – Postdysenteric arthropathy, right knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M02.161 – Postdysenteric arthropathy, right knee
What it is
M02.161 identifies reactive arthropathy affecting the right knee after dysentery or a related gastrointestinal infection. Use it when the record links the joint problem to a prior enteric infection.
Clinical signs
Typical findings include knee pain, swelling, stiffness, and reduced range of motion. Clinical features vary; refer to documentation for evidence of a postinfectious inflammatory joint process.
When to use this code
Use this code when the provider documents postdysenteric arthropathy specifically in the right knee. It fits cases where the knee arthritis is described as reactive and follows dysentery or an intestinal infection.
If the chart names another joint, a different laterality, or a nonspecific reactive arthritis, code the documented condition instead. Check documentation when the infectious trigger is unclear.
Do not use for
Do not use M02.161 for septic arthritis, traumatic knee pain, or degenerative osteoarthritis. Do not assign it unless the postdysenteric cause and right-knee site are documented.
Coding tip
Verify both the postinfectious etiology and right-knee laterality before coding, because missing either detail can change the code selection.