ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.9 > O36.90 O36.90 Maternal care for fetal problem, unspecified, unspecified trimester Non-Billable/Non-Specific Codes O36.90X0..., not applicable or unspecifiedO36.90X1..., fetus 1O36.90X2..., fetus 2O36.90X3..., fetus 3O36.90X4..., fetus 4O36.90X5..., fetus 5O36.90X9..., other fetus