ICD-10-CM > O00-O9A > O30-O48 > O35 > O35.1 > O35.11 O35.11 Maternal care for (suspected) chromosomal abnormality in fetus, Trisomy 13 Non-Billable/Non-Specific Codes O35.11X0..., not applicable or unspecifiedO35.11X1..., fetus 1O35.11X2..., fetus 2O35.11X3..., fetus 3O35.11X4..., fetus 4O35.11X5..., fetus 5O35.11X9..., other fetus