Primary osteoarthritis, left shoulder

This code signifies the degenerative joint disease affecting the left shoulder, characterized by cartilage breakdown and bone changes, without a known underlying cause. It represents the primary form of osteoarthritis, meaning it's not secondary to trauma, infection, or another systemic condition.

Apply this code when documentation explicitly states primary osteoarthritis of the left shoulder. Supporting clinical notes should describe symptoms like pain, stiffness, and reduced range of motion, along with imaging findings (e.g., X-ray showing joint space narrowing, osteophytes) consistent with degenerative changes.

• Ensure documentation specifies "primary" or "idiopathic" osteoarthritis; otherwise, consider secondary osteoarthritis codes.
• Verify the laterality (left shoulder) is clearly stated in the medical record.
• Do not confuse with codes for post-traumatic osteoarthritis or other specific types of arthropathy.