ICD-10 Code M00.17 – Pneumococcal arthritis, ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.17 – Pneumococcal arthritis, ankle and foot
What it is
M00.17 identifies a pneumococcal infection of the ankle or foot joint causing septic arthritis. Use it when Streptococcus pneumoniae is documented as the organism and the affected site is the ankle or foot.
Clinical signs
Typical findings include acute joint pain, swelling, warmth, and limited range of motion in the ankle or foot. Clinical features vary; refer to documentation for confirmation of pneumococcal cause and joint involvement.
When to use this code
Use this code when the provider documents pneumococcal septic arthritis affecting the ankle or foot, including culture-confirmed or clearly stated pneumococcal infection. It is appropriate for inpatient, outpatient, or emergency records when the diagnosis is established. Check documentation if the organism or joint site is unclear.
Do not use for
Do not use it for arthritis without infection, for another organism, or when the affected joint is not the ankle or foot. If documentation only says “septic arthritis” without pneumococcal identification, check documentation.
Coding tip
Assign the code only when both the organism and the ankle/foot site are documented.