O23 – Infections of genitourinary tract in pregnancy

ICD-10-CM 2027 diagnosis code · Other maternal disorders predominantly related to pregnancy

Non-billable header

ICD-10-CM code O23

Code: O23 (claims format: O23)
Description: Infections of genitourinary tract in pregnancy
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 15. Pregnancy, childbirth and the puerperium (O00-O9A)
Block: O20-O29 Other maternal disorders predominantly related to pregnancy

Billable codes under O23

O23 is a header code and cannot be used on claims. Choose the most specific code:

O23.0 – Infections of kidney in pregnancyHeader (more codes below)
O23.1 – Infections of bladder in pregnancyHeader (more codes below)
O23.2 – Infections of urethra in pregnancyHeader (more codes below)
O23.3 – Infections of other parts of urinary tract in pregnancyHeader (more codes below)
O23.4 – Unspecified infection of urinary tract in pregnancyHeader (more codes below)
O23.5 – Infections of the genital tract in pregnancyHeader (more codes below)
O23.9 – Unspecified genitourinary tract infection in pregnancyHeader (more codes below)

Notes for O23

Excludes2 (not included here):

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)

Use additional code:

code to identify organism (B95.-, B96.-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Block O20-O29

Excludes2 (not included here):

maternal care related to the fetus and amniotic cavity and possible delivery problems (O30-O48)
maternal diseases classifiable elsewhere but complicating pregnancy, labor and delivery, and the puerperium (O98-O99)

Frequently asked questions

What is ICD-10 code O23?

O23 is the ICD-10-CM code for infections of genitourinary tract in pregnancy, in the block O20-O29 (Other maternal disorders predominantly related to pregnancy).

Is O23 a billable code?

No. O23 is a header code with more specific child codes; report one of the billable codes listed above.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.