O36.8399 — Maternal care for abnormalities of the fetal heart rate or rhythm, unspecified trimester, other fetus
Is O36.8399 billable?
Yes, but O36.8399 is an unspecified code. O36.8399 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, O36.8399 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 O36.8399 — the more specific alternatives are listed below.
More specific alternatives
- O36.8319Maternal care for abnormalities of the fetal heart rate or rhythm, first trimester, other fetus
- O36.8329Maternal care for abnormalities of the fetal heart rate or rhythm, second trimester, other fetus
- O36.8339Maternal care for abnormalities of the fetal heart rate or rhythm, third trimester, other fetus
O36.8399 at a glance
| Code | O36.8399 |
|---|---|
| Description | Maternal care for abnormalities of the fetal heart rate or rhythm, unspecified trimester, other fetus |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "9" | other fetus |
What does the 7th character "9" mean in O36.8399?
In O36.8399, the 7th character 9 means other fetus. The 7th character is required for O36.8399 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does O36.8399 group to?
O36.8399 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 O36.8399 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O36.83, the nearest indexed parent of O36.8399. Use them to find the family, then select the specific code.
- Pregnancy › complicated by › abnormal, abnormality › fetal heart rate or rhythm (single) (uterine)
- Pregnancy › complicated by › fetal › bradycardia (single) (uterine)
- Pregnancy › complicated by › fetal › depressed heart rate tones (single) (uterine)
- Pregnancy › complicated by › fetal › heart rate irregularity (single) (uterine)
- Pregnancy › complicated by › fetal › non-reassuring heart rate or rhythm (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O36.8399 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 O36
The conditions below can never be reported together with O36.8399 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.
Use additional code — inherited from Chapter 15
Report an additional code alongside O36.8399 to fully describe the condition. O36.8399 is sequenced first.
- code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.
Excludes2 — not included here — inherited from Chapter 15
The conditions below are not part of O36.8399, but a patient may have both at the same time. When documentation supports it, O36.8399 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O36
The conditions below are not part of O36.8399, but a patient may have both at the same time. When documentation supports it, O36.8399 and the excluded code may both be reported.
- labor and delivery complicated by fetal stress (O77.-)
How long has O36.8399 existed?
O36.8399 first appears in FY2018 (FY2017 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.