Q85.8Other phakomatoses, not elsewhere classified

Q85.8 is the ICD-10-CM diagnosis code for other phakomatoses, not elsewhere classified. It belongs to category Q85 (phakomatoses, not elsewhere classified), 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.

Within Q85, choose Q85.8 (Other phakomatoses, not elsewhere classified) only when documentation doesn't support a more specific option: neurofibromatosis (nonmalignant) (Q85.0), Tuberous sclerosis (Q85.1) and Phakomatosis, unspecified (Q85.9).

To report this condition, pick the subcode that matches the documentation: Q85.81 (syndrome), Q85.82 (syndrome), Q85.83 (syndrome) and Q85.89 (classified).

Don't report Q85.8 together with the conditions in its Excludes1 note: Meckel-Gruber syndrome (Q61.9).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015, and changed in FY2023 (expanded into subcodes).

Before ICD-10, this condition was coded in ICD-9-CM as 759.6 (other hamartoses, not elsewhere classified).