Q86Congenital malformation syndromes due to known exogenous causes, not elsewhere classified

Q86 is the ICD-10-CM diagnosis code for congenital malformation syndromes due to known exogenous causes, 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: Q86.0 ((dysmorphic)), Q86.1 (syndrome), Q86.2 (warfarin) and Q86.8 (causes).

The conditions in its Excludes2 note aren't part of Q86, but may be coded alongside it if the patient has both: iodine-deficiency-related hypothyroidism (E00-E02) and nonteratogenic effects of substances transmitted via placenta or breast milk (P04.-).

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