O41.101
Infection of amniotic sac and membranes, unspecified, first trimester
O41.101 is a non-billable ICD-10-CM code header for infection of amniotic sac and membranes, unspecified, 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, 2 Excludes1 entries and 4 Excludes2 entries.
7th character
Category O41 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.
- encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
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 O41.101 7
- O41.1010Infection of amniotic sac and membranes, unspecified, first trimester, not applicable or unspecifiedBillable
- O41.1011Infection of amniotic sac and membranes, unspecified, first trimester, fetus 1Billable
- O41.1012Infection of amniotic sac and membranes, unspecified, first trimester, fetus 2Billable
- O41.1013Infection of amniotic sac and membranes, unspecified, first trimester, fetus 3Billable
- O41.1014Infection of amniotic sac and membranes, unspecified, first trimester, fetus 4Billable
- O41.1015Infection of amniotic sac and membranes, unspecified, first trimester, fetus 5Billable
- O41.1019Infection of amniotic sac and membranes, unspecified, first trimester, other fetusBillable