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O30.01

⚠ Non-billable (Header)

Twin pregnancy, monochorionic/monoamniotic

Pregnancy, childbirth and the puerperium (O00-O9A)

⚠️ This is a category header code — not billable. Use a more specific child code below.

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Also Known As

Twin pregnancy, one placenta, one amniotic sac

❌ Excludes1

direct

Cannot be coded with O30.01

  • • conjoined twins (O30.02-)

Child Codes (4)

O30.011Twin pregnancy, monochorionic/monoamniotic, first trimesterO30.012Twin pregnancy, monochorionic/monoamniotic, second trimesterO30.013Twin pregnancy, monochorionic/monoamniotic, third trimesterO30.019Twin pregnancy, monochorionic/monoamniotic, unspecified trimester

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Code Information

CodeO30.01
BillableNo — Header code
ParentO30.0
CategoryPregnancy, childbirth and the puerperium (O00-O9A)
Excludes11 rule(s)
Excludes20 note(s)
Child codes4

Data Source

CMS ICD-10-CM 2026 Tabular List

Updated October 1, 2025 (FY2026)