ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.6 > O36.61 O36.61 Maternal care for excessive fetal growth, first trimester Non-Billable/Non-Specific Codes O36.61X0..., not applicable or unspecifiedO36.61X1..., fetus 1O36.61X2..., fetus 2O36.61X3..., fetus 3O36.61X4..., fetus 4O36.61X5..., fetus 5O36.61X9..., other fetus