O30.01 — Twin pregnancy, monochorionic/monoamniotic

Not billable

Is O30.01 billable?

No — O30.01 is a non-billable header code. O30.01 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 4 billable codes beneath O30.01.

Billable codes under this header

O30.01 at a glance

Code	O30.01
Description	Twin pregnancy, monochorionic/monoamniotic
Billable	No — header code
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

How is O30.01 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to O30.01. They show the wording a clinician may have documented, which often differs from the Tabular description.

Pregnancy › twin › monochorionic/monoamniotic (single) (uterine)

Excludes1 — never code together

The conditions below can never be reported together with O30.01 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

conjoined twins (O30.02-)

Inclusion terms

Alternative wording in documentation that is classified to O30.01.

Twin pregnancy, one placenta, one amniotic sac

Excludes1 — never code together — inherited from Chapter 15

The conditions below can never be reported together with O30.01 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

supervision of normal pregnancy (Z34.-)

Use additional code — inherited from Chapter 15

Report an additional code alongside O30.01 to fully describe the condition. O30.01 is sequenced first.

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.

Excludes2 — not included here — inherited from Chapter 15

The conditions below are not part of O30.01, but a patient may have both at the same time. When documentation supports it, O30.01 and the excluded code may both be reported.

mental and behavioral disorders associated with the puerperium (F53.-)
obstetrical tetanus (A34)
postpartum necrosis of pituitary gland (E23.0)
puerperal osteomalacia (M83.0)

Code also — inherited from O30

Two codes may be needed to describe the condition fully. Whether O30.01 is sequenced first depends on the reason for the encounter.

any complications specific to multiple gestation

What codes fall under O30.01? (4)

How long has O30.01 existed?

O30.01 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.