Primary osteoarthritis, unspecified shoulder

This code signifies the presence of degenerative joint disease affecting an unspecified shoulder joint, where the etiology is primary (idiopathic) rather than secondary to trauma or another underlying condition. It represents the chronic, progressive breakdown of cartilage and bone within the shoulder, leading to pain, stiffness, and reduced range of motion.

Use this code when documentation clearly indicates osteoarthritis of the shoulder without a specified laterality (right or left) and without an identified secondary cause. This is appropriate when the physician's diagnosis is "primary osteoarthritis of the shoulder" and no further detail regarding the specific shoulder is provided.

• Avoid using this code if laterality (right or left shoulder) is documented; instead, choose the more specific M19.011 or M19.012.
• Do not use this code if the osteoarthritis is explicitly stated as secondary to trauma, infection, or another condition; instead, refer to the M19.1- series.
• Ensure the documentation supports "primary" osteoarthritis; if the etiology is unclear, query the provider for clarification.