O09.21 – Supervision of pregnancy with history of pre-term labor

ICD-10-CM 2027 diagnosis code · Supervision of high risk pregnancy (O09)

Non-billable header

ICD-10-CM code O09.21

Code: O09.21 (claims format: O0921)
Description: Supervision of pregnancy with history of pre-term labor
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O09 Supervision of high risk pregnancy (O09)
Parent codes: O09 › O09.2

Billable codes under O09.21

O09.21 is a header code and cannot be used on claims. Choose the most specific code:

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

O09.2 – Supervision of pregnancy with other poor reproductive or obstetric history

Excludes2 (not included here):

pregnancy care for patient with history of recurrent pregnancy loss (O26.2-)

Index terms for O09.21

Entries in the ICD-10-CM alphabetic index that lead to this code:

Pregnancy, supervision of, high-risk, due to, pre-term labor

Related codes in O09.2

O09.29 – Supervision of pregnancy with other poor reproductive or obstetric historyHeader

Frequently asked questions

What is ICD-10 code O09.21?

O09.21 is the ICD-10-CM code for supervision of pregnancy with history of pre-term labor, in the block O09 (Supervision of high risk pregnancy (O09)).

Is O09.21 a billable code?

No. O09.21 is a header code with more specific child codes; report one of the billable codes listed above.

What category does O09.21 belong to?

It belongs to category O09 – Supervision of high risk pregnancy.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.