ICD-10-CM > O00-O9A > O30-O48 > O33 > O33.6 O33.6 Maternal care for disproportion due to hydrocephalic fetus Non-Billable/Non-Specific Codes O33.6XX0..., not applicable or unspecifiedO33.6XX1..., fetus 1O33.6XX2..., fetus 2O33.6XX3..., fetus 3O33.6XX4..., fetus 4O33.6XX5..., fetus 5O33.6XX9..., other fetus