ICD-10 Code M00.839 – Arthritis due to other bacteria, unspecified wrist (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.839 – Arthritis due to other bacteria, unspecified wrist
What it is
M00.839 identifies bacterial arthritis in the wrist when the organism is other bacteria and the wrist laterality is not specified. Use this code for a documented infectious joint process affecting the wrist.
Clinical signs
Typical findings include acute wrist pain, swelling, warmth, and limited motion. Clinical features vary; refer to documentation for evidence of septic arthritis or confirmed bacterial joint infection.
When to use this code
Use M00.839 when the record states arthritis due to other bacteria and does not identify right or left wrist. It is appropriate when the provider documents infectious arthritis of the wrist without a more specific codeable organism or side.
If the note names a different joint, a different organism, or a more specific wrist laterality code, select that documented diagnosis instead. Check documentation when the wording is unclear.
Do not use for
Do not use this code for noninfectious inflammatory arthritis, traumatic wrist pain, or unspecified joint pain. It also should not be used when the organism or wrist laterality is documented more specifically.
Coding tip
Verify both the causative bacteria category and the unspecified wrist documentation before assigning M00.839.