O36.0121 — Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1
Is O36.0121 billable?
Yes — O36.0121 is billable for FY2027. O36.0121 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. O36.0121 may be submitted for encounters from October 1, 2026 through September 30, 2027.
O36.0121 at a glance
| Code | O36.0121 |
|---|---|
| Description | Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1 |
| Billable | Yes |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
| 7th character "1" | fetus 1 |
What does the 7th character "1" mean in O36.0121?
In O36.0121, the 7th character 1 means fetus 1. The 7th character is required for O36.0121 to be a valid, complete code.
Same condition, different episode of care — switch the 7th character:
Which MS-DRGs does O36.0121 group to?
O36.0121 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, O36.0121 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.
How is O36.0121 listed in the Alphabetic Index?
The Alphabetic Index lists these routes under O36.01, the nearest indexed parent of O36.0121. Use them to find the family, then select the specific code.
- Immunization › Rh factor › affecting management of pregnancy NEC › anti-D antibody
- Incompatibility › Rh › affecting management of pregnancy NEC › anti-D antibody
- Isoimmunization NEC › affecting management of pregnancy › Rh NEC › anti-D antibody
- Pregnancy › complicated by › Rh immunization, incompatibility or sensitization NEC › anti-D antibody (single) (uterine)
- Rh › incompatibility, immunization or sensitization › affecting management of pregnancy NEC › anti-D antibody (factor)
- Pregnancy › complicated by › isoimmunization › Rh › anti-D antibody (single) (uterine)
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O36.0121 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 O36.0121 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 O36.0121 to fully describe the condition. O36.0121 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 O36.0121, but a patient may have both at the same time. When documentation supports it, O36.0121 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O36
The conditions below are not part of O36.0121, but a patient may have both at the same time. When documentation supports it, O36.0121 and the excluded code may both be reported.
- labor and delivery complicated by fetal stress (O77.-)
How long has O36.0121 existed?
O36.0121 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.