O31.8X1
Other complications specific to multiple gestation, first trimester
O31.8X1 is a non-billable ICD-10-CM code header for other complications specific to multiple gestation, first trimester. Report a more specific code from it instead. It is part of the FY2027 code set, effective October 1, 2026. A 7th character is required to complete the code. Its coding notes include a Use additional code instruction, 1 Excludes1 entry and 7 Excludes2 entries.
7th character
Category O31 requires a 7th character.
Guidelines tip
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.
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.
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
7th-character codes under O31.8X1 7
- O31.8X10Other complications specific to multiple gestation, first trimester, not applicable or unspecifiedBillable
- O31.8X11Other complications specific to multiple gestation, first trimester, fetus 1Billable
- O31.8X12Other complications specific to multiple gestation, first trimester, fetus 2Billable
- O31.8X13Other complications specific to multiple gestation, first trimester, fetus 3Billable
- O31.8X14Other complications specific to multiple gestation, first trimester, fetus 4Billable
- O31.8X15Other complications specific to multiple gestation, first trimester, fetus 5Billable
- O31.8X19Other complications specific to multiple gestation, first trimester, other fetusBillable