O09.21
Supervision of pregnancy with history of pre-term labor
O09.21 is a non-billable ICD-10-CM code header for supervision of pregnancy with history of pre-term labor. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. The more specific codes under it are O09.211 Supervision of pregnancy with history of pre-term labor, first trimester; O09.212 Supervision of pregnancy with history of pre-term labor, second trimester; O09.213 Supervision of pregnancy with history of pre-term labor, third trimester and O09.219 Supervision of pregnancy with history of pre-term labor, unspecified trimester. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 5 Excludes2 entries.
Guidelines tips
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
The trimester character comes from the provider's documentation for the current encounter. The unspecified trimester code should rarely be used.
O09 is used only in the prenatal period. It is first-listed for routine prenatal visits in high-risk pregnancies.
Use additional code
Add the listed code as a secondary code, if known.
Also from chapter/block level (1 note)
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes1
Not coded here. The listed conditions generally should not be reported together.
Also from chapter/block level (1 note)
- supervision of normal pregnancy (Z34.-)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- pregnancy care for patient with history of recurrent pregnancy loss (O26.2-)
Also from chapter/block level (4 notes)
Notes
Also from chapter/block level (6 notes)
- CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
- Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
- Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
- 1st trimester- less than 14 weeks 0 days
- 2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
- 3rd trimester- 28 weeks 0 days until delivery
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 1 entry
More specific codes under O09.21 4
- O09.211Supervision of pregnancy with history of pre-term labor, first trimesterBillable
- O09.212Supervision of pregnancy with history of pre-term labor, second trimesterBillable
- O09.213Supervision of pregnancy with history of pre-term labor, third trimesterBillable
- O09.219Supervision of pregnancy with history of pre-term labor, unspecified trimesterBillable