All ICD10 Codes
Q85Not billable, use a more specific code below

Phakomatoses, not elsewhere classified

In Other congenital malformations (Q80-Q89), chapter 17: Congenital Malformations, Deformations and Chromosomal Abnormalities

11 billable codes under Q85: 6 are a CC; all map to HCC 23 (Prostate, Breast, and Other Cancers and Tumors).A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment. An HCC counts toward a Medicare Advantage patient's risk score.

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Instructional notes

Excludes1: not coded here, use a different code

  • ataxia telangiectasia [Louis-Bar] (G11.3)
  • familial dysautonomia [Riley-Day] (G90.1)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Assign Q00-QA1 codes for documented congenital anomalies or genetic disorders at any age, coding non-inherent manifestations separately and sequencing Z38 first on the birth admission.

Read Section I.C.17 (page 74)

All codes under Q85

Q85 can't be used on a claim. Pick a billable code below; grey headings group them.

Q85 MS-DRGs

As the principal diagnosis, the billable codes under Q85 group to these 11 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.