Hypertrophy of bone, left shoulder

This code signifies an abnormal overgrowth or enlargement of bone tissue specifically affecting the left shoulder. This hypertrophy can be a reactive process to stress, injury, or an underlying systemic condition, leading to altered joint mechanics or impingement.

Use this code when documentation clearly indicates an increase in bone mass or size in the left shoulder, often identified through imaging studies such as X-rays, CT scans, or MRI. This diagnosis is typically made when the hypertrophy is a primary finding or a significant contributing factor to the patient's symptoms.

• Ensure laterality is explicitly documented as "left shoulder"; do not assume.
• Distinguish from bone spurs (osteophytes) which are coded differently (e.g., M25.712 for osteophyte of left shoulder).
• If the hypertrophy is secondary to another condition, such as osteoarthritis, sequence the underlying condition first if it is the primary reason for the encounter.