Other hypertrophic osteoarthropathy, left shoulder

This diagnosis code signifies an abnormal overgrowth of bone and soft tissue, specifically affecting the left shoulder joint, that is not otherwise specified as primary or secondary hypertrophic osteoarthropathy. It indicates a non-inflammatory condition characterized by periostitis and new bone formation, often associated with underlying systemic diseases but without a definitive cause identified or specified as primary.

This code is appropriate when documentation specifies hypertrophic osteoarthropathy impacting the left shoulder, and the provider has not identified it as primary (idiopathic) or secondary to a known underlying condition like lung cancer or inflammatory bowel disease. It should be used when the medical record clearly indicates the left shoulder as the affected site.

• Ensure the documentation explicitly states "left shoulder" to support laterality.
• Avoid using this code if the hypertrophic osteoarthropathy is specified as primary (M89.40) or secondary (M89.42-M89.49), as those codes are more specific.
• Look for associated systemic conditions that might be the underlying cause; if identified, code the underlying condition first, followed by this code.