ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.2 > O36.22 O36.22 Maternal care for hydrops fetalis, second trimester Non-Billable/Non-Specific Codes O36.22X0..., not applicable or unspecifiedO36.22X1..., fetus 1O36.22X2..., fetus 2O36.22X3..., fetus 3O36.22X4..., fetus 4O36.22X5..., fetus 5O36.22X9..., other fetus