ICD-10 Code M00.19 – Pneumococcal Polyarthritis (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.19 – Pneumococcal polyarthritis
What it is
M00.19 identifies a joint infection caused by pneumococcal bacteria affecting multiple joints. Use it when documentation specifies pneumococcal polyarthritis rather than a nonspecific septic arthritis.
Clinical signs
Clinical features vary; refer to documentation. Typical findings in septic polyarthritis include painful, swollen, warm joints with limited motion, and the record should identify pneumococcus as the cause.
When to use this code
Use M00.19 when the provider documents pneumococcal infection involving more than one joint, or clearly states pneumococcal polyarthritis. It is appropriate when the organism is identified and the joint involvement is the coded diagnosis. Check documentation if the note only says arthritis, bacteremia, or septic joint without specifying pneumococcus.
Do not use for
Do not use this code for noninfectious inflammatory arthritis, isolated single-joint septic arthritis, or pneumococcal infection without joint involvement. If the organism or joint count is unclear, check documentation.
Coding tip
Verify both the organism and the polyarticular involvement in the provider note before assigning M00.19.