O99.891 — Other specified diseases and conditions complicating pregnancy
Is O99.891 billable?
Yes, but O99.891 is an unspecified code. O99.891 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O99.891 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting O99.891 — the more specific alternatives are listed below.
O99.891 at a glance
| Code | O99.891 |
|---|---|
| Description | Other specified diseases and conditions complicating pregnancy |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O99.891 group to?
O99.891 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
How is O99.891 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O99.891. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Pregnancy › complicated by › connective system disorders (single) (uterine)
- Pregnancy › complicated by › musculoskeletal condition (single) (uterine)
- Pregnancy › complicated by › pelvic inflammatory disease (single) (uterine)
- Pregnancy › complicated by › peritonealadhesions (single) (uterine)
- Pregnancy › complicated by › diseases of › specified NEC (single) (uterine)
- Pregnancy › complicated by › disorders of › ear and mastoid process (single) (uterine)
- Pregnancy › complicated by › disorders of › eye and adnexa (single) (uterine)
- Pregnancy › complicated by › disorders of › specified NEC (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O99.891 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 O99.891 to fully describe the condition. O99.891 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 O99
Report an additional code alongside O99.891 to fully describe the condition. O99.891 is sequenced first.
- code to identify specific condition
Use additional code — inherited from O99.8
Report an additional code alongside O99.891 to fully describe the condition. O99.891 is sequenced first.
- code to identify condition
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O99.891, but a patient may have both at the same time. When documentation supports it, O99.891 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O99
The conditions below are not part of O99.891, but a patient may have both at the same time. When documentation supports it, O99.891 and the excluded code may both be reported.
- when the reason for maternal care is that the condition is known or suspected to have affected the fetus (O35-O36)
Excludes2 — not included here — inherited from O99.8
The conditions below are not part of O99.891, but a patient may have both at the same time. When documentation supports it, O99.891 and the excluded code may both be reported.
- genitourinary infections in pregnancy (O23.-)
- infection of genitourinary tract following delivery (O86.1-O86.4)
- malignant neoplasm complicating pregnancy, childbirth and the puerperium (O9A.1-)
- maternal care for known or suspected abnormality of maternal pelvic organs (O34.-)
- postpartum acute kidney failure (O90.49)
- traumatic injuries in pregnancy (O9A.2-)
How long has O99.891 existed?
O99.891 first appears in FY2021 (FY2020 is not available, so it may have appeared then).
Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.