Q85.9

HCC Category Mapping

What This Code Means

This is an unspecified code for phakomatosis, used when a patient has a disorder involving multiple tumors and abnormal growths but the specific type is not identified.

Coding Tips

• •Avoid using this code if the specific phakomatosis can be identified; query the provider for clarification
• •This code should only be used when documentation is insufficient to assign a more specific Q85 code

Clinical Significance

Unspecified phakomatosis represents a neurocutaneous syndrome requiring medical attention but lacking sufficient documentation for specific classification, indicating need for further evaluation and characterization. These conditions typically involve the nervous system and skin with potential for complications requiring ongoing medical management.

Documentation Requirements

• ✓Clinical evidence of neurocutaneous involvement
• ✓Reason why specific phakomatosis type cannot be determined
• ✓Associated neurological manifestations
• ✓Skin or other organ system involvement
• ✓Family history when available
• ✓Genetic testing attempts or results
• ✓Need for further diagnostic evaluation

Commonly Confused Codes