O33 – Maternal care for disproportion

ICD-10-CM 2027 diagnosis code · Maternal care related to the fetus and amniotic cavity and possible delivery problems

Non-billable header

ICD-10-CM code O33

Code: O33 (claims format: O33)
Description: Maternal care for disproportion
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems

Billable codes under O33

O33 is a header code and cannot be used on claims. Choose the most specific code:

O33.0 – Maternal care for disproportion due to deformity of maternal pelvic bonesBillable
O33.1 – Maternal care for disproportion due to generally contracted pelvisBillable
O33.2 – Maternal care for disproportion due to inlet contraction of pelvisBillable
O33.3 – Maternal care for disproportion due to outlet contraction of pelvisHeader (more codes below)
O33.4 – Maternal care for disproportion of mixed maternal and fetal originHeader (more codes below)
O33.5 – Maternal care for disproportion due to unusually large fetusHeader (more codes below)
O33.6 – Maternal care for disproportion due to hydrocephalic fetusHeader (more codes below)
O33.7 – Maternal care for disproportion due to other fetal deformitiesHeader (more codes below)
O33.8 – Maternal care for disproportion of other originBillable
O33.9 – Maternal care for disproportion, unspecifiedBillable

Notes for O33

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 (not coded here):

disproportion with obstructed labor (O65-O66)

Frequently asked questions

What is ICD-10 code O33?

O33 is the ICD-10-CM code for maternal care for disproportion, in the block O30-O48 (Maternal care related to the fetus and amniotic cavity and possible delivery problems).

Is O33 a billable code?

No. O33 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.