M33.11

Billable

Other dermatomyositis with respiratory involvement

This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).

What This Code Means

Dermatomyositis in adults with involvement of the lungs and respiratory system.

Coding Tips

•Respiratory involvement in adult dermatomyositis is a serious complication; document specific pulmonary findings
•Consider coding additional respiratory conditions if interstitial lung disease or other specific lung pathology is present

Clinical Significance

Adult dermatomyositis with respiratory involvement represents one of the most serious manifestations, often associated with anti-synthetase syndrome or other poor prognostic factors. This complication requires immediate pulmonology consultation and aggressive immunosuppressive therapy.

Documentation Requirements

✓Confirmed adult dermatomyositis diagnosis
✓Documentation of respiratory system involvement
✓Pulmonary function tests showing restriction or impairment
✓High-resolution chest CT showing interstitial changes
✓Exclusion of infectious or malignant causes
✓Autoantibody testing (anti-synthetase antibodies)
✓Treatment plan including lung-protective strategies
✓Monitoring plan for respiratory function

Commonly Confused Codes

M33.01 — Use for juvenile dermatomyositis with respiratory involvement J84.10 — Use for idiopathic pulmonary fibrosis, not dermatomyositis-related M33.21 — Use for polymyositis with respiratory involvement J44.1 — Use for COPD exacerbation, not inflammatory lung disease

Code Hierarchy

└M33Dermatopolymyositis └M33.1Other dermatomyositis └M33.11Other dermatomyositis with respiratory involvement

└M33.11Other dermatomyositis with respiratory involvement