O36.1 — Maternal care for other isoimmunization
Is O36.1 billable?
No — O36.1 is a non-billable header code. O36.1 groups more specific codes and cannot be submitted on a claim. A valid ICD-10-CM code must be reported at the highest level of specificity available in its branch. Select one of the 56 billable codes beneath O36.1.
Billable codes under this header
- O36.1110Maternal care for Anti-A sensitization, first trimester, not applicable or unspecified
- O36.1111Maternal care for Anti-A sensitization, first trimester, fetus 1
- O36.1112Maternal care for Anti-A sensitization, first trimester, fetus 2
- O36.1113Maternal care for Anti-A sensitization, first trimester, fetus 3
- O36.1114Maternal care for Anti-A sensitization, first trimester, fetus 4
- O36.1115Maternal care for Anti-A sensitization, first trimester, fetus 5
- O36.1119Maternal care for Anti-A sensitization, first trimester, other fetus
- O36.1120Maternal care for Anti-A sensitization, second trimester, not applicable or unspecified
- O36.1121Maternal care for Anti-A sensitization, second trimester, fetus 1
- O36.1122Maternal care for Anti-A sensitization, second trimester, fetus 2
- O36.1123Maternal care for Anti-A sensitization, second trimester, fetus 3
- O36.1124Maternal care for Anti-A sensitization, second trimester, fetus 4
- O36.1125Maternal care for Anti-A sensitization, second trimester, fetus 5
- O36.1129Maternal care for Anti-A sensitization, second trimester, other fetus
- O36.1130Maternal care for Anti-A sensitization, third trimester, not applicable or unspecified
- O36.1131Maternal care for Anti-A sensitization, third trimester, fetus 1
- O36.1132Maternal care for Anti-A sensitization, third trimester, fetus 2
- O36.1133Maternal care for Anti-A sensitization, third trimester, fetus 3
- O36.1134Maternal care for Anti-A sensitization, third trimester, fetus 4
- O36.1135Maternal care for Anti-A sensitization, third trimester, fetus 5
- O36.1139Maternal care for Anti-A sensitization, third trimester, other fetus
- O36.1190Maternal care for Anti-A sensitization, unspecified trimester, not applicable or unspecified
- O36.1191Maternal care for Anti-A sensitization, unspecified trimester, fetus 1
- O36.1192Maternal care for Anti-A sensitization, unspecified trimester, fetus 2
- O36.1193Maternal care for Anti-A sensitization, unspecified trimester, fetus 3
- O36.1194Maternal care for Anti-A sensitization, unspecified trimester, fetus 4
- O36.1195Maternal care for Anti-A sensitization, unspecified trimester, fetus 5
- O36.1199Maternal care for Anti-A sensitization, unspecified trimester, other fetus
- O36.1910Maternal care for other isoimmunization, first trimester, not applicable or unspecified
- O36.1911Maternal care for other isoimmunization, first trimester, fetus 1
- O36.1912Maternal care for other isoimmunization, first trimester, fetus 2
- O36.1913Maternal care for other isoimmunization, first trimester, fetus 3
- O36.1914Maternal care for other isoimmunization, first trimester, fetus 4
- O36.1915Maternal care for other isoimmunization, first trimester, fetus 5
- O36.1919Maternal care for other isoimmunization, first trimester, other fetus
- O36.1920Maternal care for other isoimmunization, second trimester, not applicable or unspecified
- O36.1921Maternal care for other isoimmunization, second trimester, fetus 1
- O36.1922Maternal care for other isoimmunization, second trimester, fetus 2
- O36.1923Maternal care for other isoimmunization, second trimester, fetus 3
- O36.1924Maternal care for other isoimmunization, second trimester, fetus 4
- O36.1925Maternal care for other isoimmunization, second trimester, fetus 5
- O36.1929Maternal care for other isoimmunization, second trimester, other fetus
- O36.1930Maternal care for other isoimmunization, third trimester, not applicable or unspecified
- O36.1931Maternal care for other isoimmunization, third trimester, fetus 1
- O36.1932Maternal care for other isoimmunization, third trimester, fetus 2
- O36.1933Maternal care for other isoimmunization, third trimester, fetus 3
- O36.1934Maternal care for other isoimmunization, third trimester, fetus 4
- O36.1935Maternal care for other isoimmunization, third trimester, fetus 5
- O36.1939Maternal care for other isoimmunization, third trimester, other fetus
- O36.1990Maternal care for other isoimmunization, unspecified trimester, not applicable or unspecified
- O36.1991Maternal care for other isoimmunization, unspecified trimester, fetus 1
- O36.1992Maternal care for other isoimmunization, unspecified trimester, fetus 2
- O36.1993Maternal care for other isoimmunization, unspecified trimester, fetus 3
- O36.1994Maternal care for other isoimmunization, unspecified trimester, fetus 4
- O36.1995Maternal care for other isoimmunization, unspecified trimester, fetus 5
- O36.1999Maternal care for other isoimmunization, unspecified trimester, other fetus
O36.1 at a glance
| Code | O36.1 |
|---|---|
| Description | Maternal care for other isoimmunization |
| Billable | No — header code |
| Code set | ICD-10-CM FY2027 |
| Valid for encounters | October 1, 2026 – September 30, 2027 |
Inclusion terms
Alternative wording in documentation that is classified to O36.1.
- Maternal care for ABO isoimmunization
Excludes1 — never code together — inherited from Chapter 15
The conditions below can never be reported together with O36.1 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 O36.1 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 O36.1 to fully describe the condition. O36.1 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 O36.1, but a patient may have both at the same time. When documentation supports it, O36.1 and the excluded code may both be reported.
Excludes2 — not included here — inherited from O36
The conditions below are not part of O36.1, but a patient may have both at the same time. When documentation supports it, O36.1 and the excluded code may both be reported.
- labor and delivery complicated by fetal stress (O77.-)
What codes fall under O36.1? (2)
How long has O36.1 existed?
O36.1 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.
Which codes are confused with O36.1?
ICD-10-CM declares these codes mutually exclusive with O36.1 — exactly one of each pair can be correct for a given encounter.
What other codes are in the O36 family? (8)
- O36.0Maternal care for rhesus isoimmunizationnot billable
- O36.2Maternal care for hydrops fetalisnot billable
- O36.4Maternal care for intrauterine deathnot billable
- O36.5Maternal care for known or suspected poor fetal growthnot billable
- O36.6Maternal care for excessive fetal growthnot billable
- O36.7Maternal care for viable fetus in abdominal pregnancynot billable
- O36.8Maternal care for other specified fetal problemsnot billable
- O36.9Maternal care for fetal problem, unspecifiednot billable