Stiffness of right knee, not elsewhere classified

This code signifies a subjective or objective finding of restricted range of motion or inflexibility in the right knee joint, not attributable to a specific underlying diagnosis such as arthritis, fracture, or infection. It indicates a symptom of stiffness without a more definitive etiological classification.

Use this code when documentation explicitly states "stiffness of the right knee" and no other more specific diagnosis (e.g., osteoarthritis, internal derangement, post-traumatic stiffness) is provided or can be coded. This is often an initial or temporary diagnosis when the cause of the stiffness is still under investigation or is idiopathic.

• Ensure documentation specifies "right knee" to support laterality.
• Avoid using this code if a more specific diagnosis for the knee stiffness is documented (e.g., M17.11 for primary osteoarthritis of the right knee).
• Consider sequencing this code as a secondary diagnosis if the primary reason for the encounter is related to the stiffness but a more definitive cause is being treated or investigated.