O99.42 — Diseases of the circulatory system complicating childbirth
Is O99.42 billable?
Yes — O99.42 is billable for FY2027. O99.42 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O99.42 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O99.42 at a glance
| Code | O99.42 |
|---|---|
| Description | Diseases of the circulatory system complicating childbirth |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Which MS-DRGs does O99.42 group to?
O99.42 sits in MDC 14 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.
- 998—
As a secondary diagnosis, O99.42 is a major complication or comorbidity (MCC), which can move a stay into a higher-paying DRG.
How is O99.42 listed in the Alphabetic Index?
These are the routes through the Alphabetic Index that lead to O99.42. They show the wording a clinician may have documented, which often differs from the Tabular description.
- Delivery › complicated › by › circulatory system disorder (childbirth) (labor)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O99.42 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.-)
Excludes1 — never code together — inherited from O99.4
The conditions below can never be reported together with O99.42 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
- peripartum cardiomyopathy (O90.3)
Use additional code — inherited from Chapter 15
Report an additional code alongside O99.42 to fully describe the condition. O99.42 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 O99.42 to fully describe the condition. O99.42 is sequenced first.
- code to identify specific condition
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O99.42, but a patient may have both at the same time. When documentation supports it, O99.42 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O99
The conditions below are not part of O99.42, but a patient may have both at the same time. When documentation supports it, O99.42 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 O99.4
The conditions below are not part of O99.42, but a patient may have both at the same time. When documentation supports it, O99.42 and the excluded code may both be reported.
How long has O99.42 existed?
O99.42 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.