ICD-10-CM > O00-O9A > O30-O48 > O35 > O35.0 > O35.04 O35.04 Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele Non-Billable/Non-Specific Codes O35.04X0..., not applicable or unspecifiedO35.04X1..., fetus 1O35.04X2..., fetus 2O35.04X3..., fetus 3O35.04X4..., fetus 4O35.04X5..., fetus 5O35.04X9..., other fetus