ICD-10 Code M00.10 – Pneumococcal arthritis, unspecified joint (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.10 – Pneumococcal arthritis, unspecified joint
What it is
This code identifies septic arthritis caused by Streptococcus pneumoniae when the affected joint is not specified. Use it for documented pneumococcal joint infection rather than nonspecific joint pain or swelling.
Clinical signs
Typical findings include an acutely painful, swollen, warm joint with limited range of motion. Clinical features vary; refer to documentation for the confirmed organism and the joint involved.
When to use this code
Use M00.10 when the provider documents pneumococcal arthritis and does not name a specific joint. It also fits cases where synovial fluid, culture, or other documentation supports pneumococcal infection of a joint. If the record specifies the joint, code more specifically when available.
Do not use for
Do not use this code for arthritis due to other organisms, noninfectious arthritis, or unspecified joint pain without infection. Check documentation if the causative organism is not clearly stated.
Coding tip
Verify both the organism and the joint description before assigning M00.10.