O35.09 vs Z03.7
O35.09 (Maternal care for (suspected) other central nervous system malformation or damage in fetus) compared with Z03.7 (Encounter for suspected maternal and fetal conditions ruled out), 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. O35.09 carries an Excludes1 note covering Z03.7: “encounter for suspected maternal and fetal conditions ruled out (Z03.7-)”
Sole exception: when the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).
No — do not report together. Z03.7 carries an Excludes1 note covering O35.09: “known or suspected fetal anomalies affecting management of mother, not ruled out (O26.-, O35.-, O36.-, O40.-, O41.-)”
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
| O35.09Maternal care for (suspected) other central nervous system malformation or damage in fetus | Z03.7Encounter for suspected maternal and fetal conditions ruled out | |
|---|---|---|
| Billing status | Non-billable header Report instead: O35.09X0, O35.09X1, O35.09X2, O35.09X3, O35.09X4 | Non-billable header |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Maternal care for (suspected) other central nervous system malformation or damage in fetus is a non-billable ICD-10-CM category code (O35.09). | Encounter for suspected maternal and fetal conditions ruled out is a non-billable ICD-10-CM category code (Z03.7). |
| 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. | — |
| Includes | the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy | Encounter for suspected maternal and fetal conditions not found |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources