O99.519 — Diseases of the respiratory system complicating pregnancy, unspecified trimester
Is O99.519 billable?
Yes, but O99.519 is an unspecified code. O99.519 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O99.519 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 O99.519 — the more specific alternatives are listed below.
O99.519 at a glance
| Code | O99.519 |
|---|---|
| Description | Diseases of the respiratory system complicating pregnancy, unspecified trimester |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O99.519 group to?
O99.519 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 O99.519 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O99.51, the nearest indexed parent of O99.519. Use them to find the family, then select the specific code.
- Pregnancy › complicated by › pneumonia (single) (uterine)
- Pregnancy › complicated by › respiratory condition (single) (uterine)
- Pregnancy › complicated by › upper respiratory infection (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O99.519 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 O99.519 to fully describe the condition. O99.519 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 O99.519 to fully describe the condition. O99.519 is sequenced first.
- code to identify specific condition
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O99.519, but a patient may have both at the same time. When documentation supports it, O99.519 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O99
The conditions below are not part of O99.519, but a patient may have both at the same time. When documentation supports it, O99.519 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)
How long has O99.519 existed?
O99.519 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.