O30.033 Twin pregnancy, monochorionic/diamniotic, third trimester

✓ Billable ICD-10-CM 2026
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The ICD-10-CM code for Twin pregnancy, monochorionic/diamniotic, third trimester is O30.033 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Section
O30-O48: Maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
Category O30
115 codes (88 billable)
FY2026 Status
Stable since FY2024

U.S. Hospital Utilization

  • An estimated 11,390 U.S. inpatient stays in 2023 included O30.033 among the documented diagnoses.
  • 3,980 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

References

Related Codes

Parent Code

O30 Multiple gestation

Related Codes in O30

O30 Multiple gestation O30.0 Twin pregnancy O30.00 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs O30.001 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester O30.002 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester O30.003 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester O30.009 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester O30.01 Twin pregnancy, monochorionic/monoamniotic O30.011 Twin pregnancy, monochorionic/monoamniotic, first trimester O30.012 Twin pregnancy, monochorionic/monoamniotic, second trimester O30.013 Twin pregnancy, monochorionic/monoamniotic, third trimester O30.019 Twin pregnancy, monochorionic/monoamniotic, unspecified trimester O30.02 Conjoined twin pregnancy O30.021 Conjoined twin pregnancy, first trimester O30.022 Conjoined twin pregnancy, second trimester O30.023 Conjoined twin pregnancy, third trimester O30.029 Conjoined twin pregnancy, unspecified trimester O30.03 Twin pregnancy, monochorionic/diamniotic O30.031 Twin pregnancy, monochorionic/diamniotic, first trimester O30.032 Twin pregnancy, monochorionic/diamniotic, second trimester
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Reviewed by Prajwal Shrestha, CPC, CRC
Certified Professional Coder (CPC) and Certified Risk Adjustment Coder (CRC) · AAPC Member ID 01997614 · About · Editorial policy · Content last reviewed: 2025-10-01

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