O41.90
Disorder of amniotic fluid and membranes, unspecified, unspecified trimester
Choose the additional character
O41.90 needs more characters to be billable. Pick the specific code below.
- O41.90X0Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, not applicable or unspecifiedBillable
- O41.90X1Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 1Billable
- O41.90X2Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2Billable
- O41.90X3Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 3Billable
- O41.90X4Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 4Billable
- O41.90X5Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 5Billable
- O41.90X9Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, other fetusBillable
This code does not map to a risk-adjusting HCC in the loaded models.
Coding notes
Excludes 1 never coded together · Excludes 2 may co-exist
encounter for suspected maternal and fetal conditions ruled out (Z03.7-)
One of the following 7th characters is to be assigned to each code under category O41. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O41 that has a 7th character of 1 through 9.
| Character | Meaning |
|---|---|
| 0 | not applicable or unspecified |
| 1 | fetus 1 |
| 2 | fetus 2 |
| 3 | fetus 3 |
| 4 | fetus 4 |
| 5 | fetus 5 |
| 9 | other fetus |
supervision of normal pregnancy (Z34.-)
mental and behavioral disorders associated with the puerperium (F53.-) obstetrical tetanus (A34) postpartum necrosis of pituitary gland (E23.0) puerperal osteomalacia (M83.0)
code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
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
Official Guidelines for O41.90
FY 2026 ›Subsections
- I.C.15.aGeneral Rules for Obstetric Cases
- I.C.15.bSelection of OB Principal or First-listed Diagnosis
- I.C.15.cPre-existing conditions versus conditions due to the pregnancy
- I.C.15.dPre-existing hypertension in pregnancy
- I.C.15.eFetal Conditions Affecting the Management of the Mother
- I.C.15.fHIV Infection in Pregnancy, Childbirth and the Puerperium
- I.C.15.gDiabetes mellitus in pregnancy
- I.C.15.hLong term use of insulin and oral hypoglycemics
- I.C.15.iGestational (pregnancy induced) diabetes
- I.C.15.jSepsis and septic shock complicating abortion, pregnancy, childbirth and the puerperium
- I.C.15.kPuerperal sepsis
- I.C.15.lAlcohol, tobacco and drug use during pregnancy, childbirth and the puerperium
- I.C.15.mPoisoning, toxic effects, adverse effects and underdosing in a pregnant patient
- I.C.15.nNormal Delivery, Code O80
- I.C.15.oThe Peripartum and Postpartum Periods
- I.C.15.pCode O94, Sequelae of complication of pregnancy, childbirth, and the puerperium
- I.C.15.qTermination of Pregnancy and Spontaneous abortions
- I.C.15.rAbuse in a pregnant patient
- I.C.15.sCOVID-19 infection in pregnancy, childbirth, and the puerperium
Sections that reference O41.90
- I.C.15.a.5)Unspecified trimester
… Where applicable, a 7th character is to be assigned for certain categories (O31, O32, O33.3 - O33.6, O35, O36, O40, O41, O60.1, O60.2, O64, and O69) to identify the fetus for which the complication code applies. …
- I.C.21.c.6)ObservationChapter 21
… condition that are inconclusive following testing and evaluation, assign the appropriate code from category O35, O36, O40 or O41. The observation Z code categories: Z03 Encounter for medical observation for suspected diseases and conditions ruled out Z04 …
- I.C.15.a.1)Codes from chapter 15 and sequencing priority
Obstetric cases require codes from chapter 15, codes in the range O00- O9A, Pregnancy, Childbirth, and the Puerperium. …
Sections whose FY 2026 text names O41.90, its O41 category, or a range containing it — the chapter guidance above is the authoritative source.