O36.0 vs O36.2
O36.0 (Maternal care for rhesus isoimmunization) compared with O36.2 (Maternal care for hydrops fetalis), from the official CMS tabular data. Do not report these codes together: the official tabular list marks them Excludes1.
Can these codes be reported together?
No — do not report together. O36.2 carries an Excludes1 note covering O36.0: “hydrops fetalis associated with rhesus isoimmunization (O36.0-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
Side by side
| O36.0Maternal care for rhesus isoimmunization | O36.2Maternal care for hydrops fetalis | |
|---|---|---|
| Billing status | Non-billable header Report instead: O36.0110, O36.0111, O36.0112, O36.0113, O36.0114 | Non-billable header Report instead: O36.20X0, O36.20X1, O36.20X2, O36.20X3, O36.20X4 |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Maternal care for rhesus isoimmunization is a non-billable ICD-10-CM category code (O36.0). | Maternal care for hydrops fetalis is a non-billable ICD-10-CM category code (O36.2). |
| 7th character | One of the following 7th characters is to be assigned to each code under category O36. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O36 that has a 7th character of 1 through 9. | One of the following 7th characters is to be assigned to each code under category O36. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O36 that has a 7th character of 1 through 9. |
| Includes | the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy Maternal care for Rh incompatibility (with hydrops fetalis) | the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy Maternal care for hydrops fetalis NOS Maternal care for hydrops fetalis not associated with isoimmunization |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources