Coding and coverage · ICD-10-CM

O33 Maternal care for disproportion

Not billable (header)Chapter 15

Report one of the more specific codes below.

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Codes under this one

  • O33.0 Maternal care for disproportion due to deformity of maternal pelvic bones
  • O33.1 Maternal care for disproportion due to generally contracted pelvis
  • O33.2 Maternal care for disproportion due to inlet contraction of pelvis
  • O33.3 Maternal care for disproportion due to outlet contraction of pelvisHeader
  • O33.4 Maternal care for disproportion of mixed maternal and fetal originHeader
  • O33.5 Maternal care for disproportion due to unusually large fetusHeader
  • O33.6 Maternal care for disproportion due to hydrocephalic fetusHeader
  • O33.7 Maternal care for disproportion due to other fetal deformitiesHeader
  • O33.8 Maternal care for disproportion of other origin
  • O33.9 Maternal care for disproportion, unspecified

Instructional notes

Chapter 15

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • supervision of normal pregnancy (Z34.-)
Excludes2Not included here: the patient may have both; report both when both are present.
  • 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 codeAdd a second code for the full picture.
  • code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Notes
  • 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

This code

Excludes1Not coded here: never report with this code, except when the two conditions are unrelated.
  • disproportion with obstructed labor (O65-O66)
Includes
  • the listed conditions as a reason for observation, hospitalization or other obstetric care of the mother, or for cesarean delivery before onset of labor

Chapter 15: Pregnancy, childbirth and the puerperium (O00-O9A) · O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)

Source: ICD-10-CM FY 2027 code descriptions and tabular list (CMS and CDC National Center for Health Statistics), effective 2026-10-01 through 2027-09-30 · CMS ICD-10 files. HCC mapping: CMS-HCC V28, payment year 2027. As of 2026-11-04.

Coverage and payment depend on the claim details; confirm with the Medicare Administrative Contractor.