ICD-10-CM 2027 diagnosis code
O30.02Conjoined twin pregnancy
O30.02 is a header code, so it can't be reported by itself. Choose one of the 4 more specific codes beneath it.
Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About O30.02
O30.02 is the ICD-10-CM diagnosis code for conjoined twin pregnancy. It belongs to category O30 (multiple gestation), block O30-O48 (maternal care related to the fetus and amniotic cavity and possible delivery problems) and chapter 15 (pregnancy, childbirth and the puerperium). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.
Within O30.0 (twin pregnancy), O30.02 is specifically for conjoined twin pregnancy. Related codes cover unspecified number of placenta and unspecified number of amniotic sacs (O30.00), monochorionic/monoamniotic (O30.01), monochorionic/diamniotic (O30.03), dichorionic/diamniotic (O30.04) and unable to determine number of placenta and number of amniotic sacs (O30.09).
To report this condition, pick the subcode that matches the documentation: O30.021 (first trimester), O30.022 (second trimester), O30.023 (third trimester) and O30.029 (unspecified trimester).
It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.
Specific codes under O30.02
Notes that apply from higher levels
Instructions written at a parent level also apply to O30.02.
› From O30 Multiple gestation
- any complications specific to multiple gestation
Broader instructions also apply from Chapter 15: Pregnancy, childbirth and the puerperium.
Alphabetic index entries
4 entriesTerms in the official ICD-10-CM index that lead to O30.02.
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › conjoined twins
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › fetal (maternal care for) › conjoined twins
- Pregnancy (single) (uterine) › complicated by (care of) (management affected by) › multiple gestations › conjoined twins
- Pregnancy (single) (uterine) › twin › conjoined
Codes whose notes reference O30.02
- O30.01Excludes1
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
- No changes since FY2016.
Common questions about O30.02
Is O30.02 billable?
- No. O30.02 is a header code. Report one of its more specific subcodes instead.