ICD-10-CM 2027 diagnosis code
O36.11Maternal care for Anti-A sensitization
O36.11 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it and add the required 7th character.
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 O36.11
O36.11 is the ICD-10-CM diagnosis code for maternal care for Anti-A sensitization. It belongs to category O36 (maternal care for other fetal problems), 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 4 subcodes must be used instead.
Within O36.1 (maternal care for other isoimmunization), O36.11 is specifically for maternal care for Anti-A sensitization. Related codes cover other isoimmunization (O36.19).
Codes in this range require a 7th character: 0 for not applicable or unspecified, 1 for fetus 1, 2 for fetus 2, 3 for fetus 3, 4 for fetus 4, 5 for fetus 5 and 1 more. Use placeholder "X" characters to fill any empty positions before the 7th character.
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
7th character
One of the following 7th characters is to be assigned to each code under category O36. 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 O36 that has a 7th character of 1 through 9.
- O36.111Maternal care for Anti-A sensitization, first trimester
- O36.112Maternal care for Anti-A sensitization, second trimester
- O36.113Maternal care for Anti-A sensitization, third trimester
- O36.119Maternal care for Anti-A sensitization, unspecified trimester
- 0not applicable or unspecified
- 1fetus 1
- 2fetus 2
- 3fetus 3
- 4fetus 4
- 5fetus 5
- 9other fetus
Coding notes
- Maternal care for isoimmunization NOS (with hydrops fetalis)
Notes that apply from higher levels
Instructions written at a parent level also apply to O36.11.
› From O36 Maternal care for other fetal problems
- the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy
- labor and delivery complicated by fetal stress (O77.-)
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
9 entriesTerms in the official ICD-10-CM index that lead to O36.11.
- Incompatibility › ABO › affecting management of pregnancy
- Incompatibility › ABO › affecting management of pregnancy › anti-A sensitization
- Incompatibility › blood (group) (Duffy) (K) (Kell) (Kidd) (Lewis) (M) (S) NEC › affecting management of pregnancy
- Incompatibility › blood (group) (Duffy) (K) (Kell) (Kidd) (Lewis) (M) (S) NEC › affecting management of pregnancy › anti-A sensitization
- Isoimmunization NEC › affecting management of pregnancy (ABO) (with hydrops fetalis)
- Isoimmunization NEC › affecting management of pregnancy (ABO) (with hydrops fetalis) › anti-A sensitization
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › hydrops › fetalis › associated with isoimmunization
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › isoimmunization
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › isoimmunization › anti-A sensitization
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O36.11
Is O36.11 billable?
- No. O36.11 is a header code. Report one of its more specific subcodes instead.