2027 ICD-10-CM Diagnosis Code O33Maternal care for disproportion

ICD-10-CM Codes›O00-O9A›O30-O48›O33

ICD-10-CM O33
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

O33 is a non-billable ICD-10-CM category code for maternal care for disproportion, so it cannot be submitted on claims. Use a more specific code from this category instead, such as O33.0, O33.1, O33.2, and O33.3XX0.

Code Identity

ICD-10-CM Code
O33
Billable Status
No — Non-Billable Category
Code Describes
Maternal care for disproportion
Short Description
Maternal care for disproportion
Same as the full description in the CMS dataset.
Chapter
O30-O48
Maternal care related to the fetus and amniotic cavity and possible delivery problems

Code Classification

ChapterO00-O9APregnancy, childbirth and the puerperium
SectionO30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
CategoryO33Maternal care for disproportion
This CodeO33Maternal care for disproportion

Specific Coding for Maternal care for disproportionOverview

Non-specific codes like O33 require more characters. Use one of these billable codes instead:

  • Use O33.0 for Maternal care for disproportion due to deformity of maternal pelvic bones

  • Use O33.1 for Maternal care for disproportion due to generally contracted pelvis

  • Use O33.2 for Maternal care for disproportion due to inlet contraction of pelvis

  • O33.3 for Maternal care for disproportion due to outlet contraction of pelvis

  • O33.4 for Maternal care for disproportion of mixed maternal and fetal origin

  • O33.5 for Maternal care for disproportion due to unusually large fetus

  • O33.6 for Maternal care for disproportion due to hydrocephalic fetus

  • O33.7 for Maternal care for disproportion due to other fetal deformities

  • Use O33.8 for Maternal care for disproportion of other origin

  • Use O33.9 for Maternal care for disproportion, unspecified

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to O33: its own notes plus those printed at Chapter 15. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, 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

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

On O33 itself
  • disproportion with obstructed labor (O65-O66)
From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • supervision of normal pregnancy (Z34.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • mental and behavioral disorders associated with the puerperium (F53.-)
  • obstetrical tetanus (A34)
  • postpartum necrosis of pituitary gland (E23.0)
  • puerperal osteomalacia (M83.0)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Notes

General instructions on how these codes are used.

From Chapter 15 (O00-O9A) Pregnancy, childbirth and the puerperium applies to 2,481 codes
  • CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
  • Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
  • Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
  • 1st trimester- less than 14 weeks 0 days
  • 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
  • 3rd trimester- 28 weeks 0 days until delivery

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name O33, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming O33: they are not reported together with it, unless the two conditions are unrelated.

  • M95.5 Acquired deformity of pelvis
    maternal care for known or suspected disproportion (O33.-)

Patient EducationClinical

Childbirth Problems

Childbirth is the process of giving birth to a baby. It includes labor and delivery. Usually everything goes well, but problems can happen. They may cause a risk to the mother, baby, or both. Some of the more common childbirth problems include:

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About O33Overview

What is the ICD-10 code for maternal care for disproportion?

O33 is the ICD-10-CM category for maternal care for disproportion, but it is a non-billable header: claims need a more specific code from this category, listed on this page.

Is O33 (Maternal care for disproportion) a billable code?

No. This is a category header that groups the codes for maternal care for disproportion, and headers cannot be submitted on claims. Claims for maternal care for disproportion need a more specific code from this category, such as O33.0, O33.1, and O33.2.