ICDwise
O35 ⚠ Non-billable

Maternal care for known or suspected fetal abnormality and damage

ICD-10-CM · FY2026 · Pregnancy, Childbirth and the Puerperium

Code
O35
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Pregnancy, Childbirth and the Puerperium
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.

Official coding notes

From CMS's ICD-10-CM Tabular List.

Includes
  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Excludes1 — never code together
  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code also
  • any associated maternal condition
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.

Frequently asked questions

What is ICD-10 code O35?
ICD-10-CM code O35 represents Maternal care for known or suspected fetal abnormality and damage. It is a non-billable header code requiring a more specific subcategory in the Pregnancy, Childbirth and the Puerperium chapter, effective October 1, 2025 – September 30, 2026.
Is O35 billable?
No. O35 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is O35 in?
O35 belongs to the Pregnancy, Childbirth and the Puerperium chapter (O00–O9A) of ICD-10-CM.

Related codes in the O35 category

O35.0 Maternal care for (suspected) central nervous system malformation in fetus Non-billable O35.00 Maternal care for (suspected) central nervous system malformation or damage in fetus, unspecified Non-billable O35.01 Maternal care for (suspected) central nervous system malformation or damage in fetus, agenesis of the corpus callosum Non-billable O35.02 Maternal care for (suspected) central nervous system malformation or damage in fetus, anencephaly Non-billable O35.03 Maternal care for (suspected) central nervous system malformation or damage in fetus, choroid plexus cysts Non-billable O35.04 Maternal care for (suspected) central nervous system malformation or damage in fetus, encephalocele Non-billable O35.05 Maternal care for (suspected) central nervous system malformation or damage in fetus, holoprosencephaly Non-billable O35.06 Maternal care for (suspected) central nervous system malformation or damage in fetus, hydrocephaly Non-billable

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