ICD-10-CM > O00-O9A > O30-O48 > O35 > O35.0 > O35.00 O35.00 Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified Non-Billable/Non-Specific Codes O35.00X0..., not applicable or unspecifiedO35.00X1..., fetus 1O35.00X2..., fetus 2O35.00X3..., fetus 3O35.00X4..., fetus 4O35.00X5..., fetus 5O35.00X9..., other fetus