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ICD-10-CM 2027 diagnosis code

O33Maternal care for disproportion

Not billable — use a more specific code

O33 is a header code, so it can't be reported by itself. Choose one of the 10 more specific codes beneath it.

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 O33

O33 is the ICD-10-CM diagnosis code for maternal care for disproportion. 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 10 subcodes must be used instead.

To report this condition, pick the subcode that matches the documentation: O33.0 (due to deformity of maternal pelvic bones), O33.1 (due to generally contracted pelvis), O33.2 (due to inlet contraction of pelvis), O33.3 (due to outlet contraction of pelvis), O33.4 (of mixed maternal and fetal origin), O33.5 (due to unusually large fetus), O33.6 (due to hydrocephalic fetus), O33.7 (due to other fetal deformities) and 2 more.

Don't report O33 together with the conditions in its Excludes1 note: disproportion with obstructed labor (O65-O66).

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 O33

Coding notes

IncludesFurther defines the content of the category
  • the listed conditions as a reason for observation, hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor
Excludes1Not coded here — never report together with this code
  • disproportion with obstructed labor (O65-O66)

Notes that apply from higher levels

Instructions written at a parent level also apply to O33.

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

Codes whose notes reference O33

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 O33

Is O33 billable?

No. O33 is a header code. Report one of its more specific subcodes instead.