ICD-10-CM > O00-O9A > O30-O48 > O35 > O35.0 > O35.06 O35.06 Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly Non-Billable/Non-Specific Applicable To Maternal care for fetal hydrocephalus Codes O35.06X0..., not applicable or unspecifiedO35.06X1..., fetus 1O35.06X2..., fetus 2O35.06X3..., fetus 3O35.06X4..., fetus 4O35.06X5..., fetus 5O35.06X9..., other fetus