O36.0121 vs O36.0122
O36.0121 (Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1) compared with O36.0122 (Maternal care for anti-D [Rh] antibodies, second trimester, fetus 2), from the official CMS tabular data.
Summary
No tabular note links these codes. Both belong to category O36, and nothing in the tabular list prevents reporting each when it is documented.
Registry fact- What is different?
Title wording.The titles differ in one word, “1” (O36.0121) versus “2” (O36.0122): O36.0121 is “Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1”; O36.0122 is “Maternal care for anti-D [Rh] antibodies, second trimester, fetus 2”.
Registry fact
- Can these codes be reported together?
No instruction prevents it.No note in either entry names the other. Both belong to category O36; each may be reported when its own documentation is present.
Registry fact
- Is there an Excludes1 relationship?
None.Neither entry carries an Excludes1 note that names the other code. O36.0121 carries 2 Excludes1 notes and O36.0122 carries 2 Excludes1 notes covering other codes; the side-by-side table quotes them.
Official rule
- Is there an Excludes2 relationship?
None.Neither entry carries an Excludes2 note that names the other code. O36.0121 carries 1 Excludes2 note and O36.0122 carries 1 Excludes2 note covering other codes; the side-by-side table quotes them.
Official rule
- Is one more specific?
No.Neither is a subdivision of the other, and neither title is the unspecified form; they describe different conditions within category O36.
Registry fact
- Is one a parent or header code?
No.Both are billable codes, and neither contains the other.
Registry fact
- Are there sequencing instructions?
None.Neither entry carries a Code First or Use Additional Code note that names the other.
Official rule
- Are there other coding relationships?
None found.No laterality, encounter-phase, Table of Neoplasms, Table of Drugs and Chemicals, or history-versus-active-disease relationship links these codes.
MedCoder-derived
Official rule: a tabular instructional note or a section of the ICD-10-CM Official Guidelines, quoted as published. Registry fact: the codes’ own published attributes (titles, billable status, position in the hierarchy, code set). MedCoder-derived: a reading MedCoder computes from those facts; it is not itself a rule. How to read the labels
Can these codes be reported together?
Yes, when each is documented. O36.0121 and O36.0122 both belong to category O36.
No Excludes1/Excludes2 relationship exists between these codes in the official tabular list. The code titles state what each one covers, and the documentation decides which applies.
Side by side
| O36.0121Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1 | O36.0122Maternal care for anti-D [Rh] antibodies, second trimester, fetus 2 | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) | O00-O9A — Pregnancy, Childbirth and the Puerperium (O00-O9A) |
| Definition | Maternal care for anti-D [Rh] antibodies, second trimester, fetus 1 is a billable ICD-10-CM diagnosis code (O36.0121). | Maternal care for anti-D [Rh] antibodies, second trimester, fetus 2 is a billable ICD-10-CM diagnosis code (O36.0122). |
| 7th character | One of the following 7th characters is to be assigned to each code under category O36. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O36 that has a 7th character of 1 through 9. | One of the following 7th characters is to be assigned to each code under category O36. 7th character 0 is for single gestations and multiple gestations where the fetus is unspecified. 7th characters 1 through 9 are for cases of multiple gestations to identify the fetus for which the code applies. The appropriate code from category O30, Multiple gestation, must also be assigned when assigning a code from category O36 that has a 7th character of 1 through 9. |
| Includes | the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy | the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy |
| Excludes1 | encounter for suspected maternal and fetal conditions ruled out (Z03.7-) placental transfusion syndromes (O43.0-) | encounter for suspected maternal and fetal conditions ruled out (Z03.7-) placental transfusion syndromes (O43.0-) |
| Excludes2 | labor and delivery complicated by fetal stress (O77.-) | labor and delivery complicated by fetal stress (O77.-) |
Notes are the code’s own tabular entry, quoted as published. A note that names the other code is the one the verdict above rests on.
Derived from the official CMS ICD-10-CM tabular data (FY2027). A coding-rule comparison, not billing advice: payer-specific edits and medical-necessity policy are outside its scope. All data sources