ICD-10-CM > O00-O9A > O30-O48 > O36 > O36.1 > O36.11 O36.11 Maternal care for Anti-A sensitization Non-Billable/Non-Specific Applicable To Maternal care for isoimmunization NOS (with hydrops fetalis) Codes O36.111Maternal care for Anti-A sensitization, first trimesterO36.1110..., not applicable or unspecifiedO36.1111..., fetus 1O36.1112..., fetus 2O36.1113..., fetus 3O36.1114..., fetus 4O36.1115..., fetus 5O36.1119..., other fetusO36.112Maternal care for Anti-A sensitization, second trimesterO36.1120..., not applicable or unspecifiedO36.1121..., fetus 1O36.1122..., fetus 2O36.1123..., fetus 3O36.1124..., fetus 4O36.1125..., fetus 5O36.1129..., other fetusO36.113Maternal care for Anti-A sensitization, third trimesterO36.1130..., not applicable or unspecifiedO36.1131..., fetus 1O36.1132..., fetus 2O36.1133..., fetus 3O36.1134..., fetus 4O36.1135..., fetus 5O36.1139..., other fetusO36.119Maternal care for Anti-A sensitization, unspecified trimesterO36.1190..., not applicable or unspecifiedO36.1191..., fetus 1O36.1192..., fetus 2O36.1193..., fetus 3O36.1194..., fetus 4O36.1195..., fetus 5O36.1199..., other fetus