O33.5 is a non-billable/non-specific diagnosis code from the 2025 ICD-10-CM used to classify the following condition: Maternal care for disproportion due to unusually large fetus.
Inclusion term
Maternal care for disproportion due to disproportion of fetal origin with normally formed fetus
Maternal care for disproportion due to fetal disproportion NOS
Seventh character note
One of the following 7th characters is to be assigned to code O33.5. 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 code O33.5 with a 7th character of 1 through 9.
Seventh character extensions
0: not applicable or unspecified
1: fetus 1
2: fetus 2
3: fetus 3
4: fetus 4
5: fetus 5
9: other fetus
Codes
O33.5XX0
Maternal care for disproportion due to unusually large fetus, not applicable or unspecified
O33.5XX1
Maternal care for disproportion due to unusually large fetus, fetus 1
O33.5XX2
Maternal care for disproportion due to unusually large fetus, fetus 2
O33.5XX3
Maternal care for disproportion due to unusually large fetus, fetus 3
O33.5XX4
Maternal care for disproportion due to unusually large fetus, fetus 4
O33.5XX5
Maternal care for disproportion due to unusually large fetus, fetus 5
O33.5XX9
Maternal care for disproportion due to unusually large fetus, other fetus
Versions
2025
No changes
2024
No changes
2023
No changes
2022
No changes
2021
No changes
2020
No changes
2019
No changes
2018
No changes
2017
No changes
2016
New code