Primary osteoarthritis, unspecified hand

This code signifies the presence of degenerative joint disease primarily affecting the hand, where the underlying cause is not secondary to trauma, infection, or other systemic conditions. It indicates a chronic, progressive breakdown of cartilage in the hand joints, leading to pain, stiffness, and reduced function. The "unspecified" nature means the specific joint(s) within the hand affected are not documented.

Use this code when documentation clearly states "primary osteoarthritis of the hand" without specifying individual digits or carpal joints. It is appropriate when the provider's assessment confirms osteoarthritis as the primary diagnosis and the affected hand joint(s) are not precisely identified. Supporting documentation would include clinical notes detailing hand pain, stiffness, and radiographic findings consistent with osteoarthritis.

• Avoid using this code if the specific hand joint (e.g., carpometacarpal, interphalangeal) is documented; instead, use a more specific code from the M19.04- series.
• Ensure the documentation explicitly states "primary" osteoarthritis to differentiate it from secondary forms (e.g., post-traumatic).
• Do not use this code if the laterality (right or left hand) is specified; use M19.041 or M19.042 accordingly.