O35 Maternal care for known or suspected fetal abnormality and damage
The ICD-10-CM code for Maternal care for known or suspected fetal abnormality and damage is O35 (FY2026). It is a non-billable category code — select a more specific code below for claims.
Classification
- Section
- O30-O48: Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
- Category O35
- 36 codes (33 billable)
- FY2026 Status
- Stable since FY2024
Official Coding Guidelines
Assign O35/O36 only if fetal condition modifies maternal mgmte. Fetal Conditions Affecting the Management of the Mother 1) Codes from categories O35 and O36 Codes from categories O35, Maternal care for known or suspected fetal abnormality and damage, and O36, Maternal care for other fetal problems, are assigned only when the fetal condition is actually responsible for modifying the management of the mother, i.e., by requiring diagnostic studies, additional observation, special care, or termination of pregnancy. The fact that the fetal condition exists does not justify assigning a code from this series to the mother’s record.
In utero surgery: use O35 for fetal condition; no Ch 16 codes2) In utero surgery In cases when surgery is performed on the fetus, a diagnosis code from category O35, Maternal care for known or suspected fetal abnormality and damage, should be assigned identifying the fetal condition. Assign the appropriate procedure code for the procedure performed. No code from Chapter 16, the perinatal codes, should be used on the mother’s record to identify fetal conditions. Surgery performed in utero on a fetus is still to be coded as an obstetric encounter.
Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026