ICD-10 Code M00.172 – Pneumococcal arthritis, left ankle and foot (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.172 – Pneumococcal arthritis, left ankle and foot
What it is
This code identifies septic arthritis caused by Streptococcus pneumoniae in the left ankle and foot joints. Use it when the record specifically documents pneumococcal infection affecting that site.
Clinical signs
Typical findings include acute joint pain, swelling, warmth, and limited range of motion. Fever or systemic illness may be present; clinical features vary, so refer to documentation.
When to use this code
Use this code when the provider documents pneumococcal arthritis involving the left ankle or foot, or when culture or other clear documentation identifies S. pneumoniae as the cause. Code the left-sided location exactly as recorded. If laterality or organism is unclear, check documentation.
Do not use for
Do not use this code for noninfectious arthritis, unspecified septic arthritis, or pneumococcal infection at another joint site. If the organism or joint location is not documented, do not assume this code.
Coding tip
Verify both the causative organism and the exact left ankle/foot site before assigning M00.172.