ICD-10-CM Tabular Index · Chapter 15 · FY 2026 O30

Multiple gestation (O30) ICD-10-CM

The O30 code range covers multiple gestation with 115 ICD-10-CM diagnosis codes. 88 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.

✓ Built from the official CMS FY 2026 datasetEffective Oct 1, 2025 – Sep 30, 2026
115
Diagnosis Codes
88
Billable Codes
O30
Code Range
O30–O48
Parent Section

Code Also

A "code also" note instructs that two codes may be required to fully describe a condition, but this note does not provide sequencing direction.

ICD-10-CM

Codes in the O30 Range 115 codes · 88 billable

115 of 115 shown
  • O30 Multiple gestationNon-billable
  • O30.0 Twin pregnancyNon-billable
  • O30.00 Twin pregnancy, unspecified number of placenta and unspecified number of amniotic sacsNon-billable
  • 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/monoamnioticNon-billable
  • 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 pregnancyNon-billable
  • 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/diamnioticNon-billable
  • O30.031 Twin pregnancy, monochorionic/diamniotic, first trimester
  • O30.032 Twin pregnancy, monochorionic/diamniotic, second trimester
  • O30.033 Twin pregnancy, monochorionic/diamniotic, third trimester
  • O30.039 Twin pregnancy, monochorionic/diamniotic, unspecified trimester
  • O30.04 Twin pregnancy, dichorionic/diamnioticNon-billable
  • O30.041 Twin pregnancy, dichorionic/diamniotic, first trimester
  • O30.042 Twin pregnancy, dichorionic/diamniotic, second trimester
  • O30.043 Twin pregnancy, dichorionic/diamniotic, third trimester
  • O30.049 Twin pregnancy, dichorionic/diamniotic, unspecified trimester
  • O30.09 Twin pregnancy, unable to determine number of placenta and number of amniotic sacsNon-billable
  • O30.091 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester
  • O30.092 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester
  • O30.093 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester
  • O30.099 Twin pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester
  • O30.1 Triplet pregnancyNon-billable
  • O30.10 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacsNon-billable
  • O30.101 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester
  • O30.102 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester
  • O30.103 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester
  • O30.109 Triplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester
  • O30.11 Triplet pregnancy with two or more monochorionic fetusesNon-billable
  • O30.111 Triplet pregnancy with two or more monochorionic fetuses, first trimester
  • O30.112 Triplet pregnancy with two or more monochorionic fetuses, second trimester
  • O30.113 Triplet pregnancy with two or more monochorionic fetuses, third trimester
  • O30.119 Triplet pregnancy with two or more monochorionic fetuses, unspecified trimester
  • O30.12 Triplet pregnancy with two or more monoamniotic fetusesNon-billable
  • O30.121 Triplet pregnancy with two or more monoamniotic fetuses, first trimester
  • O30.122 Triplet pregnancy with two or more monoamniotic fetuses, second trimester
  • O30.123 Triplet pregnancy with two or more monoamniotic fetuses, third trimester
  • O30.129 Triplet pregnancy with two or more monoamniotic fetuses, unspecified trimester
  • O30.13 Triplet pregnancy, trichorionic/triamnioticNon-billable
  • O30.131 Triplet pregnancy, trichorionic/triamniotic, first trimester
  • O30.132 Triplet pregnancy, trichorionic/triamniotic, second trimester
  • O30.133 Triplet pregnancy, trichorionic/triamniotic, third trimester
  • O30.139 Triplet pregnancy, trichorionic/triamniotic, unspecified trimester
  • O30.19 Triplet pregnancy, unable to determine number of placenta and number of amniotic sacsNon-billable
  • O30.191 Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester
  • O30.192 Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester
  • O30.193 Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester
  • O30.199 Triplet pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester
  • O30.2 Quadruplet pregnancyNon-billable
  • O30.20 Quadruplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacsNon-billable
  • O30.201 Quadruplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, first trimester
  • O30.202 Quadruplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, second trimester
  • O30.203 Quadruplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, third trimester
  • O30.209 Quadruplet pregnancy, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester
  • O30.21 Quadruplet pregnancy with two or more monochorionic fetusesNon-billable
  • O30.211 Quadruplet pregnancy with two or more monochorionic fetuses, first trimester
  • O30.212 Quadruplet pregnancy with two or more monochorionic fetuses, second trimester
  • O30.213 Quadruplet pregnancy with two or more monochorionic fetuses, third trimester
  • O30.219 Quadruplet pregnancy with two or more monochorionic fetuses, unspecified trimester
  • O30.22 Quadruplet pregnancy with two or more monoamniotic fetusesNon-billable
  • O30.221 Quadruplet pregnancy with two or more monoamniotic fetuses, first trimester
  • O30.222 Quadruplet pregnancy with two or more monoamniotic fetuses, second trimester
  • O30.223 Quadruplet pregnancy with two or more monoamniotic fetuses, third trimester
  • O30.229 Quadruplet pregnancy with two or more monoamniotic fetuses, unspecified trimester
  • O30.23 Quadruplet pregnancy, quadrachorionic/quadra-amnioticNon-billable
  • O30.231 Quadruplet pregnancy, quadrachorionic/quadra-amniotic, first trimester
  • O30.232 Quadruplet pregnancy, quadrachorionic/quadra-amniotic, second trimester
  • O30.233 Quadruplet pregnancy, quadrachorionic/quadra-amniotic, third trimester
  • O30.239 Quadruplet pregnancy, quadrachorionic/quadra-amniotic, unspecified trimester
  • O30.29 Quadruplet pregnancy, unable to determine number of placenta and number of amniotic sacsNon-billable
  • O30.291 Quadruplet pregnancy, unable to determine number of placenta and number of amniotic sacs, first trimester
  • O30.292 Quadruplet pregnancy, unable to determine number of placenta and number of amniotic sacs, second trimester
  • O30.293 Quadruplet pregnancy, unable to determine number of placenta and number of amniotic sacs, third trimester
  • O30.299 Quadruplet pregnancy, unable to determine number of placenta and number of amniotic sacs, unspecified trimester
  • O30.8 Other specified multiple gestationNon-billable
  • O30.80 Other specified multiple gestation, unspecified number of placenta and unspecified number of amniotic sacsNon-billable
  • O30.801 Other specified multiple gestation, unspecified number of placenta and unspecified number of amniotic sacs, first trimester
  • O30.802 Other specified multiple gestation, unspecified number of placenta and unspecified number of amniotic sacs, second trimester
  • O30.803 Other specified multiple gestation, unspecified number of placenta and unspecified number of amniotic sacs, third trimester
  • O30.809 Other specified multiple gestation, unspecified number of placenta and unspecified number of amniotic sacs, unspecified trimester
  • O30.81 Other specified multiple gestation with two or more monochorionic fetusesNon-billable
  • O30.811 Other specified multiple gestation with two or more monochorionic fetuses, first trimester
  • O30.812 Other specified multiple gestation with two or more monochorionic fetuses, second trimester
  • O30.813 Other specified multiple gestation with two or more monochorionic fetuses, third trimester
  • O30.819 Other specified multiple gestation with two or more monochorionic fetuses, unspecified trimester
  • O30.82 Other specified multiple gestation with two or more monoamniotic fetusesNon-billable
  • O30.821 Other specified multiple gestation with two or more monoamniotic fetuses, first trimester
  • O30.822 Other specified multiple gestation with two or more monoamniotic fetuses, second trimester
  • O30.823 Other specified multiple gestation with two or more monoamniotic fetuses, third trimester
  • O30.829 Other specified multiple gestation with two or more monoamniotic fetuses, unspecified trimester
  • O30.83 Other specified multiple gestation, number of chorions and amnions are both equal to the number of fetusesNon-billable
  • O30.831 Other specified multiple gestation, number of chorions and amnions are both equal to the number of fetuses, first trimester
  • O30.832 Other specified multiple gestation, number of chorions and amnions are both equal to the number of fetuses, second trimester
  • O30.833 Other specified multiple gestation, number of chorions and amnions are both equal to the number of fetuses, third trimester
  • O30.839 Other specified multiple gestation, number of chorions and amnions are both equal to the number of fetuses, unspecified trimester
  • O30.89 Other specified multiple gestation, unable to determine number of placenta and number of amniotic sacsNon-billable
  • O30.891 Other specified multiple gestation, unable to determine number of placenta and number of amniotic sacs, first trimester
  • O30.892 Other specified multiple gestation, unable to determine number of placenta and number of amniotic sacs, second trimester
  • O30.893 Other specified multiple gestation, unable to determine number of placenta and number of amniotic sacs, third trimester
  • O30.899 Other specified multiple gestation, unable to determine number of placenta and number of amniotic sacs, unspecified trimester
  • O30.9 Multiple gestation, unspecifiedNon-billable
  • O30.90 Multiple gestation, unspecified, unspecified trimester
  • O30.91 Multiple gestation, unspecified, first trimester
  • O30.92 Multiple gestation, unspecified, second trimester
  • O30.93 Multiple gestation, unspecified, third trimester

Clinical Terms in This Code Range

Definitions from the National Library of Medicine for conditions coded in the O30 range.

Superfetation

The FERTILIZATION of an OVUM that takes place when a FETUS is already present in the UTERUS. Superfetation results in an unusual PREGNANCY with fetuses of different ages and sizes developing in utero simultaneously.

About the O30 Code Range

The ICD-10 codes in the O30 section are used to classify pregnancies involving multiple fetuses. These codes cover various types of multiple gestations, including twins, triplets, quadruplets, and other higher-order pregnancies.

These codes specify details like the number of fetuses, the chorionicity (number of placentas) and amnionicity (number of amniotic sacs), as well as the pregnancy trimester. For example, the ICD-10 code O30.0 identifies a twin pregnancy, while O30.01 is for monochorionic/monoamniotic twins, and O30.02 covers conjoined twins. Synonyms such as monochorionic diamniotic twin pregnancy and twin-to-twin transfusion syndrome relate to specific codes within this range, helping coders find precise classifications. Codes like O30.1 and O30.2 denote triplet and quadruplet pregnancies, respectively, with subcategories for different placental and amniotic arrangements. Unspecified multiple gestations use codes like O30.9. These detailed codes assist healthcare professionals and coders in documenting multiple pregnancies accurately, reflecting their complexity and specific characteristics.

Questions About This Page

How many billable codes are in the O30 range?

Of the 115 codes in this range, 88 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.

What does the O30 range classify?

The range classifies multiple gestation. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.

Related References

All ICD-10-CM ChaptersAll of Chapter 15ICD-10-CM Code LookupMS-DRG ReferenceMedicare Code EditsPOA Exempt Codes

Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.