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

Billable ICD-10-CM code, FY2026.

Applicable to

• Maternal care for disproportion due to contracted pelvis NOS causing disproportion

Applies from O33 Maternal care for disproportion

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

Excludes1 (never code together)

• disproportion with obstructed labor (O65-O66)

MS-DRG index

Defines the logic of DRG(s) 817-819 in MDC 14.

Approximate ICD-9-CM (GEMs)

• 653.11 Generally contracted pelvis, delivered, with or without mention of antepartum condition (approximate)
• 653.13 Generally contracted pelvis, antepartum condition or complication (approximate)

Medicare Code Edits (MCE v43.1 (April 2026))

• Maternity diagnoses (age 9 through 64): Age conflict edit. These diagnoses are clinically expected only in patients age 9 through 64.

Code annotations containing back-references to O33.1

Back-references to O33

• Type 1 Excludes: M95.5 Acquired deformity of pelvis ("maternal care for known or suspected disproportion (O33.-)")

Diagnosis Index entries for O33.1

• Contraction (s), contracture, contracted › pelvis (acquired) (general) › with disproportion (fetopelvic)
• Infancy, infantile, infantilism › pelvis › with disproportion (fetopelvic)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › contracted pelvis (general)
• Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › disproportion (due to) › generally contracted pelvis
• Small (ness) › pelvis › with disproportion (fetopelvic)

Nearby codes

• O33 Maternal care for disproportion
• O33.0 Maternal care for disproportion due to deformity of maternal pelvic bones
• O33.1 Maternal care for disproportion due to generally contracted pelvis (this code)
• O33.2 Maternal care for disproportion due to inlet contraction of pelvis
• O33.3 Maternal care for disproportion due to outlet contraction of pelvis
• O33.3XX0 Maternal care for disproportion due to outlet contraction of pelvis, not applicable or unspecified
• O33.3XX1 Maternal care for disproportion due to outlet contraction of pelvis, fetus 1
• O33.3XX2 Maternal care for disproportion due to outlet contraction of pelvis, fetus 2