Infections of genitourinary tract in pregnancy (O23) ICD-10-CM
The O23 code range covers infections of genitourinary tract in pregnancy with 47 ICD-10-CM diagnosis codes. 36 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Use Additional Code
The “use additional code” indicates that a secondary code could be used to further specify the patient’s condition. This note is not mandatory and is only used if enough information is available to assign an additional code.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
- gonococcal infections complicating pregnancy, childbirth and the puerperium O98.2
- infections with a predominantly sexual mode of transmission NOS complicating pregnancy, childbirth and the puerperium O98.3
- syphilis complicating pregnancy, childbirth and the puerperium O98.1
- tuberculosis of genitourinary system complicating pregnancy, childbirth and the puerperium O98.0
- venereal disease NOS complicating pregnancy, childbirth and the puerperium O98.3
Codes in the O23 Range 47 codes · 36 billable
- O23 Infections of genitourinary tract in pregnancyNon-billable
- O23.0 Infections of kidney in pregnancyNon-billable
- O23.00 Infections of kidney in pregnancy, unspecified trimester
- O23.01 Infections of kidney in pregnancy, first trimester
- O23.02 Infections of kidney in pregnancy, second trimester
- O23.03 Infections of kidney in pregnancy, third trimester
- O23.1 Infections of bladder in pregnancyNon-billable
- O23.10 Infections of bladder in pregnancy, unspecified trimester
- O23.11 Infections of bladder in pregnancy, first trimester
- O23.12 Infections of bladder in pregnancy, second trimester
- O23.13 Infections of bladder in pregnancy, third trimester
- O23.2 Infections of urethra in pregnancyNon-billable
- O23.20 Infections of urethra in pregnancy, unspecified trimester
- O23.21 Infections of urethra in pregnancy, first trimester
- O23.22 Infections of urethra in pregnancy, second trimester
- O23.23 Infections of urethra in pregnancy, third trimester
- O23.3 Infections of other parts of urinary tract in pregnancyNon-billable
- O23.30 Infections of other parts of urinary tract in pregnancy, unspecified trimester
- O23.31 Infections of other parts of urinary tract in pregnancy, first trimester
- O23.32 Infections of other parts of urinary tract in pregnancy, second trimester
- O23.33 Infections of other parts of urinary tract in pregnancy, third trimester
- O23.4 Unspecified infection of urinary tract in pregnancyNon-billable
- O23.40 Unspecified infection of urinary tract in pregnancy, unspecified trimester
- O23.41 Unspecified infection of urinary tract in pregnancy, first trimester
- O23.42 Unspecified infection of urinary tract in pregnancy, second trimester
- O23.43 Unspecified infection of urinary tract in pregnancy, third trimester
- O23.5 Infections of the genital tract in pregnancyNon-billable
- O23.51 Infection of cervix in pregnancyNon-billable
- O23.511 Infections of cervix in pregnancy, first trimester
- O23.512 Infections of cervix in pregnancy, second trimester
- O23.513 Infections of cervix in pregnancy, third trimester
- O23.519 Infections of cervix in pregnancy, unspecified trimester
- O23.52 Salpingo-oophoritis in pregnancyNon-billable
- O23.521 Salpingo-oophoritis in pregnancy, first trimester
- O23.522 Salpingo-oophoritis in pregnancy, second trimester
- O23.523 Salpingo-oophoritis in pregnancy, third trimester
- O23.529 Salpingo-oophoritis in pregnancy, unspecified trimester
- O23.59 Infection of other part of genital tract in pregnancyNon-billable
- O23.591 Infection of other part of genital tract in pregnancy, first trimester
- O23.592 Infection of other part of genital tract in pregnancy, second trimester
- O23.593 Infection of other part of genital tract in pregnancy, third trimester
- O23.599 Infection of other part of genital tract in pregnancy, unspecified trimester
- O23.9 Unspecified genitourinary tract infection in pregnancyNon-billable
- O23.90 Unspecified genitourinary tract infection in pregnancy, unspecified trimester
- O23.91 Unspecified genitourinary tract infection in pregnancy, first trimester
- O23.92 Unspecified genitourinary tract infection in pregnancy, second trimester
- O23.93 Unspecified genitourinary tract infection in pregnancy, third trimester
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the O23 range.
Bacteriuria
The presence of bacteria in the urine which is normally bacteria-free. These bacteria are from the URINARY TRACT and are not contaminants of the surrounding tissues. Bacteriuria can be symptomatic or asymptomatic. Significant bacteriuria is an indicator of urinary tract infection.
Urinary Tract
The duct which coveys URINE from the pelvis of the KIDNEY through the URETERS, BLADDER, and URETHRA.
About the O23 Code Range
The O23 ICD-10 codes are used to classify infections of the genitourinary tract during pregnancy, covering specific infections of the kidney, bladder, urethra, other urinary parts, and genital tract. These codes help specify the infection type and the pregnancy trimester when applicable.
This section includes detailed subcodes for conditions like pyelonephritis in pregnancy (O23.00) – an infection of the kidney –, and cystitis of pregnancy (O23.10), which refers to bladder infections during pregnancy. The codes also cover urethral infections, other urinary infections, and various genital tract infections such as cervix infections and salpingo-oophoritis (inflammation of fallopian tubes and ovaries), with distinctions by trimester. Codes like O23.40 cover unspecified urinary tract infections including asymptomatic bacteriuria, while O23.599 includes bacterial vaginosis and vaginal candidiasis in pregnancy. These ICD-10 codes for genitourinary tract infections in pregnancy allow medical professionals to precisely document and code infections that can affect maternal and fetal health during various pregnancy stages.
Questions About This Page
How many billable codes are in the O23 range?
Of the 47 codes in this range, 36 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the O23 range classify?
The range classifies infections of genitourinary tract in pregnancy. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
