2026 ICD-10-CM Diagnosis Code O23.10Infections of bladder in pregnancy, unspecified trimester
ICD-10-CM Codes›O00-O9A›O20-O29›O23
- Billable — Valid for Submission
- Not Chronic
O23.10 is a billable ICD-10-CM diagnosis code for infections of bladder in pregnancy, unspecified trimester. 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). Coders also document this condition as acute cystitis in pregnancy, antepartum. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified complications in pregnancy and Urinary tract infections.
This medical diagnosis code is frequently used in OB/GYN medical specialties to designate conditions such maternal disorders related to pregnancy.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for O23.10.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Acute cystitis in pregnancy, antepartum
- Cystitis of pregnancy
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Infections and Pregnancy
During pregnancy, some common infections such as the common cold or a skin infection do not usually cause serious problems. Some infections, such as the flu, can be more severe when you're pregnant. But other infections can be harmful to you, your fetus, or both.
The full article covers:
- How can infections affect your pregnancy?
- What infections can be harmful during pregnancy?
- What are the symptoms of an infection during pregnancy?
- What are the treatments for infections during pregnancy?
- Can infections during pregnancy be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert O23.10 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About O23.10Overview
Is O23.10 (Infections of bladder in pregnancy) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report infections of bladder in pregnancy, unspecified trimester on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does O23.10 group to?
When infections of bladder in pregnancy, unspecified trimester 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 O23.10 be reported for?
The Medicare Code Editor checks infections of bladder in pregnancy, unspecified trimester 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 O23.10?
Under the General Equivalence Mappings, infections of bladder in pregnancy, unspecified trimester converts to ICD-9-CM 646.60 (gu infect in preg-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.
