O23.591 — Infection of other part of genital tract in pregnancy, first trimester
Is O23.591 billable?
Yes — O23.591 is billable for FY2027. O23.591 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O23.591 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O23.591 at a glance
| Code | O23.591 |
|---|---|
| Description | Infection of other part of genital tract in pregnancy, first trimester |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O23.591 group to?
O23.591 sits in MDC 14 and helps define the logic of 3 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 817Other Antepartum Diagnoses with O.R. Procedures with MCCsurgical
- 818Other Antepartum Diagnoses with O.R. Procedures with CCsurgical
- 819Other Antepartum Diagnoses with O.R. Procedures without CC/MCCsurgical
As a secondary diagnosis, O23.591 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is O23.591 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O23.59, the nearest indexed parent of O23.591. Use them to find the family, then select the specific code.
- Pregnancy › complicated by › vaginitis or vulvitis (single) (uterine)
- Pregnancy › complicated by › infection › genital organ or tract › specified NEC (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O23.591 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- supervision of normal pregnancy (Z34.-)
Use additional code — inherited from Chapter 15
Report an additional code alongside O23.591 to fully describe the condition. O23.591 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Use additional code — inherited from O23
Report an additional code alongside O23.591 to fully describe the condition. O23.591 is sequenced first.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O23.591, but a patient may have both at the same time. When documentation supports it, O23.591 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O20-O29
The conditions below are not part of O23.591, but a patient may have both at the same time. When documentation supports it, O23.591 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O23
The conditions below are not part of O23.591, but a patient may have both at the same time. When documentation supports it, O23.591 and the excluded code may both be reported.
- 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)
How long has O23.591 existed?
O23.591 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.