ICD-10 Code M00.162 – Pneumococcal arthritis, left knee (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.162 – Pneumococcal arthritis, left knee
What it is
Pneumococcal arthritis of the left knee is a joint infection caused by Streptococcus pneumoniae. It indicates septic arthritis affecting the left knee specifically.
Clinical signs
Typical findings include a painful, swollen, warm knee with reduced range of motion and difficulty bearing weight. Fever may occur, but clinical features vary; refer to documentation.
When to use this code
Use this code when the provider documents pneumococcal septic arthritis involving the left knee. You may also use it when the record clearly identifies Streptococcus pneumoniae as the cause and the left knee as the site. Check documentation if the organism or laterality is unclear.
Do not use for
Do not use it for arthritis caused by other organisms, noninfectious inflammatory arthritis, or unspecified knee infection. If the knee side is not documented, check documentation before assigning a laterality-specific code.
Coding tip
Confirm both the organism and the left-knee site in the provider note before coding.