Primary osteoarthritis, unspecified site

This code signifies the presence of degenerative joint disease, specifically osteoarthritis, where the underlying cause is not secondary to another condition. It indicates a chronic, progressive condition characterized by cartilage breakdown, bone changes, and joint pain, without specifying which particular joint is affected.

Apply this code when the medical record clearly documents a diagnosis of primary osteoarthritis but does not specify the anatomical location of the affected joint(s). This is appropriate when the physician's documentation lacks specificity regarding the site, or when the osteoarthritis is generalized and not localized to a single, identifiable joint.

• Avoid using this code if the documentation specifies any particular joint (e.g., knee, hip, hand); instead, use the more specific site-specific codes.
• Ensure the documentation explicitly states "primary" or "idiopathic" osteoarthritis to differentiate from secondary forms.
• This code should be used as a last resort when no further specificity regarding the anatomical site can be obtained from the medical record.