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  5. Maternal care for disproportion (O33)

Maternal care for disproportion (O33)

ICD-10 code section O33 covers maternal care for disproportion, addressing complications where there is a size mismatch between the fetus and the maternal pelvis that can affect labor and delivery. This includes specific conditions based on maternal pelvic deformities, contractions, or fetal size and shape abnormalities.

The codes in the O33 category specify different causes of this disproportion. For example, O33.0 is for disproportion due to deformity of the maternal pelvic bones, often referred to as "Disproportion - major pelvic abnormality" or "Pelvis not adequate for delivery." O33.1 and O33.2 denote generally contracted pelvis or inlet contraction of the pelvis, known variously as "Contracted pelvis" or "Pelvic disproportion." Variations also include outlet pelvic contractions (O33.3), mixed maternal and fetal causes (O33.4), and fetal factors like unusually large fetus (O33.5) or hydrocephalic fetus (O33.6). Other fetal deformities causing disproportion fall under O33.7, while unspecified causes and other origins are covered under O33.9 and O33.8. These codes help coders identify precise causes behind cephalopelvic disproportion, assisting in correct maternal care documentation and treatment planning.

  • Pregnancy, childbirth and the puerperium (O00-O9A)

    • Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)

        • Maternal care for disproportion (O33)

        • 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
        • 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
        • O33.3XX3 Maternal care for disproportion due to outlet contraction of pelvis, fetus 3
        • O33.3XX4 Maternal care for disproportion due to outlet contraction of pelvis, fetus 4
        • O33.3XX5 Maternal care for disproportion due to outlet contraction of pelvis, fetus 5
        • O33.3XX9 Maternal care for disproportion due to outlet contraction of pelvis, other fetus
        • O33.4 Maternal care for disproportion of mixed maternal and fetal origin
        • O33.4XX0 Maternal care for disproportion of mixed maternal and fetal origin, not applicable or unspecified
        • O33.4XX1 Maternal care for disproportion of mixed maternal and fetal origin, fetus 1
        • O33.4XX2 Maternal care for disproportion of mixed maternal and fetal origin, fetus 2
        • O33.4XX3 Maternal care for disproportion of mixed maternal and fetal origin, fetus 3
        • O33.4XX4 Maternal care for disproportion of mixed maternal and fetal origin, fetus 4
        • O33.4XX5 Maternal care for disproportion of mixed maternal and fetal origin, fetus 5
        • O33.4XX9 Maternal care for disproportion of mixed maternal and fetal origin, other fetus
        • O33.5 Maternal care for disproportion due to unusually large fetus
        • 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
        • O33.6 Maternal care for disproportion due to hydrocephalic fetus
        • O33.6XX0 Maternal care for disproportion due to hydrocephalic fetus, not applicable or unspecified
        • O33.6XX1 Maternal care for disproportion due to hydrocephalic fetus, fetus 1
        • O33.6XX2 Maternal care for disproportion due to hydrocephalic fetus, fetus 2
        • O33.6XX3 Maternal care for disproportion due to hydrocephalic fetus, fetus 3
        • O33.6XX4 Maternal care for disproportion due to hydrocephalic fetus, fetus 4
        • O33.6XX5 Maternal care for disproportion due to hydrocephalic fetus, fetus 5
        • O33.6XX9 Maternal care for disproportion due to hydrocephalic fetus, other fetus
        • O33.7 Maternal care for disproportion due to other fetal deformities
        • O33.7XX0 Maternal care for disproportion due to other fetal deformities, not applicable or unspecified
        • O33.7XX1 Maternal care for disproportion due to other fetal deformities, fetus 1
        • O33.7XX2 Maternal care for disproportion due to other fetal deformities, fetus 2
        • O33.7XX3 Maternal care for disproportion due to other fetal deformities, fetus 3
        • O33.7XX4 Maternal care for disproportion due to other fetal deformities, fetus 4
        • O33.7XX5 Maternal care for disproportion due to other fetal deformities, fetus 5
        • O33.7XX9 Maternal care for disproportion due to other fetal deformities, other fetus
        • O33.8 Maternal care for disproportion of other origin
        • O33.9 Maternal care for disproportion, unspecified

Instructional Notations

Includes

This note appears immediately under a three character code title to further define, or give 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

Type 1 Excludes

A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

  • disproportion with obstructed labor O65 O66

Clinical Terms

The following clinical terms provide additional context, helping users better understand the clinical background and common associations for each diagnosis listed in this section. Including related terms alongside ICD-10-CM codes supports coders, billers, and healthcare professionals in improving accuracy, enhancing documentation, and facilitating research or patient education.

Cephalopelvic Disproportion

A condition in which the HEAD of the FETUS is larger than the mother's PELVIS through which the fetal head must pass during a vaginal delivery.