ICD-10 Code M00.171 – Pneumococcal arthritis, right ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.171 – Pneumococcal arthritis, right ankle and foot
What it is
M00.171 identifies a pneumococcal infection causing arthritis in the right ankle and foot. Use it when Streptococcus pneumoniae is documented as the cause of the joint infection.
Clinical signs
Typical findings include an acutely painful, swollen, warm joint with reduced range of motion. Fever may be present, and clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents pneumococcal septic arthritis affecting the right ankle or foot. It is appropriate when the organism and anatomic site are both specified in the record. If laterality or the causative organism is unclear, check documentation.
Do not use for
Do not use this code for arthritis caused by other organisms or for noninfectious inflammatory arthritis. Do not assign it if the infection site is not the right ankle and foot.
Coding tip
Confirm both the pneumococcal organism and right-sided location before coding; otherwise, query the provider.