M33.13

HCC Category Mapping

What This Code Means

A rare autoimmune disease causing a characteristic skin rash and inflammation without significant muscle weakness or damage.

Coding Tips

• •Confirm documentation explicitly states absence of myopathy or muscle involvement
• •Ensure skin manifestations are documented (heliotrope rash, Gottron papules) to support dermatomyositis diagnosis

Clinical Significance

Adult dermatomyositis without myopathy, often called amyopathic dermatomyositis, still carries significant risks including interstitial lung disease and malignancy. This form requires the same vigilant monitoring and treatment as classic dermatomyositis despite preserved muscle strength.

Documentation Requirements

• ✓Confirmed adult dermatomyositis diagnosis
• ✓Characteristic skin manifestations documented
• ✓Documentation of absent or minimal muscle weakness
• ✓Normal or minimally elevated muscle enzymes
• ✓Preserved muscle strength on examination
• ✓Malignancy screening completed
• ✓Lung function assessment performed
• ✓Treatment plan for skin and systemic involvement

Commonly Confused Codes