ICD-10 Code M00.849 – Arthritis due to other bacteria, unspecified hand (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code M00.849 – Arthritis due to other bacteria, unspecified hand
What it is
This code identifies septic arthritis of the hand caused by bacteria other than the common specified organisms, when the exact hand joint is not documented. Use it for an infectious arthritis diagnosis limited to the hand.
Clinical signs
Typical findings include acute joint pain, swelling, warmth, redness, and reduced motion in the hand. Clinical features vary; refer to documentation for the infecting organism and the specific joint involved.
When to use this code
Use M00.849 when the record documents bacterial arthritis in the hand, but the provider does not name a more specific hand joint. It also applies when the organism is described as “other bacteria” and no more detailed code is supported. Check documentation if the site is unclear.
Do not use for
Do not use this code for noninfectious arthritis, traumatic joint pain, or arthritis in a different body site. If the organism or exact hand joint is specified, choose the more precise code.
Coding tip
Verify both the infectious cause and the “unspecified hand” wording before assigning this code.