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ICD-10-CM 2027 diagnosis code

O35Maternal care for known or suspected fetal abnormality and damage

Not billable — use a more specific code

O35 is a header code, so it can't be reported by itself. Choose one of the 18 more specific codes beneath it.Short description: Maternal care for known or suspected fetal abnlt and damage

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About O35

O35 is the ICD-10-CM diagnosis code for maternal care for known or suspected fetal abnormality and damage. It belongs to block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 18 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O35.0 (fetus), O35.1 (fetus), O35.2 (fetus), O35.3 (mother), O35.4 (alcohol), O35.5 (drugs), O35.6 (radiation), O35.7 (procedures) and 10 more.

Don't report O35 together with the conditions in its Excludes1 note: encounter for suspected maternal and fetal conditions ruled out (Z03.7-).

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Specific codes under O35

Coding notes

IncludesFurther defines the content of the category
  • the listed conditions in the fetus as a reason for hospitalization or other obstetric care to the mother, or for termination of pregnancy
Excludes1Not coded here — never report together with this code
  • encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
Code alsoTwo codes may be needed; sequencing depends on circumstances
  • any associated maternal condition

Notes that apply from higher levels

Instructions written at a parent level also apply to O35.

Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.

Codes whose notes reference O35

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about O35

Is O35 billable?

No. O35 is a header code. Report one of its more specific subcodes instead.