Q85.89

Billable

Other phakomatoses, not elsewhere classified

HCC Category Mapping

V28HCC 23 — Melanoma and Other Skin Cancers

0.251

V24HCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.150

ESRDHCC 12 — Breast, Prostate, and Other Cancers and Tumors

0.000

RxHCCHCC 22 — Cancer, Other Specified Sites

0.000

What This Code Means

This code represents other rare inherited disorders characterized by multiple tumors and abnormal tissue growths that are not specifically classified elsewhere.

Coding Tips

•Use this code only when the specific phakomatosis is documented but does not fit Q85.0-Q85.83 categories
•Always document the specific syndrome name in the medical record to support medical necessity and allow for proper tracking

Clinical Significance

This code represents rare phakomatoses (neurocutaneous syndromes) not elsewhere classified that still carry significant implications for patient care including potential for tumor development and neurological complications. These conditions require specialized evaluation and often lifelong monitoring, even though they may be less well-characterized than the major phakomatoses.

Documentation Requirements

✓Specific phakomatosis type documented
✓Clinical features not meeting criteria for major syndromes
✓Neurological and cutaneous manifestations
✓Associated complications or comorbidities
✓Genetic testing results when available
✓Family history assessment
✓Reason other phakomatosis codes don't apply

Commonly Confused Codes

Q85.1 — Tuberous sclerosis when criteria are met Q85.00-Q85.09 — Neurofibromatosis when features present Q87.89 — Other congenital malformation syndromes Q85.9 — Unspecified phakomatosis when specific type documented

Code Hierarchy

└Q85Phakomatoses, not elsewhere classified └Q85.8Other phakomatoses, not elsewhere classified └Q85.89Other phakomatoses, not elsewhere classified

└Q85.89Other phakomatoses, not elsewhere classified