2026 ICD-10-CM Diagnosis Code O41.90X2Disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2
O41.90X2 is a billable ICD-10-CM diagnosis code for disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2. The 7th character 2 identifies fetus 2 in a multiple gestation pregnancy. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 817 through 819, 831 through 833. The code is restricted by the Medicare Code Editor to maternity cases (age 9 through 64). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Polyhydramnios and other problems of amniotic cavity.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O41.90X2.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Health Problems in Pregnancy
A health problem in pregnancy is any disease or condition that could affect your health or the health of your fetus. Some health problems may make it more likely that you will have a high-risk pregnancy. A high-risk pregnancy is one in which you, your fetus, or both are at higher risk for health problems than in a typical pregnancy.
The full article covers:
- What are health problems in pregnancy?
- What raises my risk for health problems during pregnancy?
- Can chronic health conditions cause problems in pregnancy?
- Can health problems in pregnancy be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O41.90X2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O41.90X2Overview
Is O41.90X2 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2 on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character 2 in O41.90X2 mean?
The final character 2 identifies the fetus in a multiple gestation pregnancy: this code reports disorder of amniotic fluid and membranes, unspecified, unspecified trimester for fetus 2.
What MS-DRG does O41.90X2 group to?
When disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2 is the principal diagnosis on an inpatient stay, it groups to MS-DRG 817, 818, 819, 831, 832, 833, with relative weights from 0.5229 to 1.6880 depending on complications. Higher weights mean higher Medicare reimbursement.
Who can O41.90X2 be reported for?
The Medicare Code Editor checks disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2 against patient demographics: this code is intended for maternity cases (age 9 through 64). Claims outside these limits are flagged as inconsistent.
What is the ICD-9 equivalent of O41.90X2?
Under the General Equivalence Mappings, disorder of amniotic fluid and membranes, unspecified, unspecified trimester, fetus 2 converts to ICD-9-CM 658.90 (amniotic prob NOS-unspec). The mapping is approximate, so confirm the match fits the documentation.
Footnotes
[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.
