ICD-10-CM 2027 diagnosis code

Q85Phakomatoses, not elsewhere classified

Not billable — use a more specific code

Q85 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Q85

Q85 is the ICD-10-CM diagnosis code for phakomatoses, not elsewhere classified. It belongs to block Q80-Q89 (other congenital malformations) and chapter 17 (congenital malformations, deformations, chromosomal abnormalities, and genetic disorders). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: Q85.0 ((nonmalignant)), Q85.1 (sclerosis), Q85.8 (classified) and Q85.9 (unspecified).

Don't report Q85 together with the conditions in its Excludes1 note: ataxia telangiectasia [Louis-Bar] (G11.3) and familial dysautonomia [Riley-Day] (G90.1).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under Q85

Coding notes

Excludes1Not coded here — never report together with this code

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

Notes that apply from higher levels

Instructions written at a parent level also apply to Q85.

Broader instructions also apply from Chapter 17: Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders.

Code history

2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027

FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
No changes since FY2016.

Common questions about Q85

Is Q85 billable?: No. Q85 is a header code. Report one of its more specific subcodes instead.