Other specified arthritis, left knee

This code signifies a diagnosis of arthritis affecting the left knee that does not fit into more specific categories of arthritis (e.g., rheumatoid, osteoarthritis, gout). It encompasses various less common or ill-defined arthritic conditions impacting the left knee joint.

Use this code when documentation specifies arthritis of the left knee, but the etiology is not clearly defined as a common type, or it's described as an "other specified" form of arthritis. Supporting documentation includes physician notes detailing left knee pain, swelling, or limited range of motion attributed to an arthritic process not otherwise classified.

• Always confirm the laterality (left knee) is explicitly documented.
• Ensure no more specific arthritis code (e.g., M15-M19) better describes the condition.
• Avoid using this code if the documentation is vague; query the provider for clarification.