O35.0 vs O35.1
O35.0 (Maternal care for (suspected) central nervous system malformation in fetus) compared with O35.1 (Maternal care for (suspected) chromosomal abnormality in fetus), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. O35.0 carries an Excludes2 note covering O35.1: “chromosomal abnormality in fetus (O35.1-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| O35.0Maternal care for (suspected) central nervous system malformation in fetus | O35.1Maternal care for (suspected) chromosomal abnormality in fetus | |
|---|---|---|
| Billing status | Non-billable header Report instead: O35.00X0, O35.00X1, O35.00X2, O35.00X3, O35.00X4 | Non-billable header Report instead: O35.10X0, O35.10X1, O35.10X2, O35.10X3, O35.10X4 |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Maternal care for (suspected) central nervous system malformation in fetus is a non-billable ICD-10-CM category code (O35.0). | Maternal care for (suspected) chromosomal abnormality in fetus is a non-billable ICD-10-CM category code (O35.1). |
| 7th character | One of the following 7th characters is to be assigned to each code under category O35. 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 O35 that has a 7th character of 1 through 9. | One of the following 7th characters is to be assigned to each code under category O35. 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 O35 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 to the mother, or for termination of pregnancy | the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources