Calcifcn and ossifictn of muscles assoc w burns, unsp up arm

This code describes the pathological hardening of muscle tissue in an unspecified upper arm due to the deposition of calcium salts (calcification) or the formation of bone (ossification), occurring as a direct consequence of a burn injury. This condition, known as myositis ossificans traumatica or heterotopic ossification, can lead to pain and restricted range of motion.

Use this code for patients presenting with documented evidence of calcification or ossification within the muscles of an unspecified upper arm, where the medical record clearly links this condition to a previous burn injury. This diagnosis is typically confirmed through imaging studies such as X-rays or CT scans, which show the characteristic bony or calcific deposits within the muscle.

• Ensure documentation specifies the unspecified upper arm. If left or right is known, a more specific code (M61.321 or M61.322) should be used.
• Always code the underlying burn injury (T20-T32 series) first, followed by this code as a secondary diagnosis to indicate the sequela.
• Distinguish from other forms of myositis ossificans not related to burns, which would be coded elsewhere (e.g., M61.0- for progressive myositis ossificans).