Other specified arthritis, unspecified site

This code signifies a form of arthritis that does not fit into more specific categories of inflammatory or degenerative joint disease, and for which the affected anatomical location is not documented or is unknown. It represents a diagnosis of arthritis where the specific type is identified but a more precise ICD-10-CM code is unavailable, and the laterality or specific joint involved is not specified.

Use this code when the physician's documentation clearly states "other specified arthritis" without indicating a specific joint or site. This code is appropriate when the medical record identifies a particular type of arthritis (e.g., psoriatic arthritis, reactive arthritis) but lacks detail regarding the affected body part. It should be used when more specific site codes (e.g., M13.81-M13.89) cannot be assigned due to insufficient documentation.

• Avoid using this code if a more specific anatomical site for the "other specified arthritis" is documented (e.g., M13.81 for shoulder, M13.82 for elbow).
• Query the provider if the documentation indicates "other specified arthritis" but omits the affected site, to determine if a more precise code can be assigned.
• This code should be a last resort when no other specific arthritis code, including those with site specificity, can be supported by the medical record.