O36.099 ICD-10-CA code: Maternal care for rhesus isoimmunization, unspecified trimester, unspecified as to episode of care, or not applicable
O36.099 is the ICD-10-CA code for “Maternal care for rhesus isoimmunization, unspecified trimester, unspecified as to episode of care, or not applicable” in CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026.
Official description
O36.099Maternal care for rhesus isoimmunization, unspecified trimester, unspecified as to episode of care, or not applicable
Short description: Mat Rh isoimzn unspec trim/unspecified
ICD-10-CA · Canada · Also written O36099
Notes for O36.099
As CIHI prints them, with any note O36.099 takes from the headings above it.
Includes
- Anti-D [Rh] antibodiesRh incompatibility (with hydrops fetalis)From O36.0 Maternal care for rhesus isoimmunization
- The listed conditions in the fetus as a reason for observation, hospitalization or other obstetric care of the mother, or for termination of pregnancyFrom O36 Maternal care for other known or suspected fetal problems
Excludes
Conditions classified elsewhere.
- Labour and delivery complicated by fetal stress [distress] (O68.-)placental transfusion syndromes (O43.-)From O36 Maternal care for other known or suspected fetal problems
- Certain diseases or injuries complicating pregnancy, childbirth, and the puerperium classified elsewhere:external causes (for mortality) (V,W,X,Y)injury, poisoning and certain other consequences of external causes (S00-T88.1, T88.6-T98)mental and behavioural disorders associated with the puerperium (F53.-)obstetrical tetanus (A34)postpartum necrosis of pituitary gland (E23.0)puerperal osteomalacia (M83.0)supervision of:• high-risk pregnancy (Z35.-)• normal pregnancy (Z34.-)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Note
- The codes included in this chapter are to be used for conditions related to or aggravated by the pregnancy, childbirth or by the puerperium (maternal causes or obstetric causes)From Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
Where O36.099 sits
- 1ChapterChapter 15: Pregnancy, childbirth and the puerperium (O00-O99)
- 2Block O30-O48Maternal care related to the fetus and amniotic cavity and possible delivery problems
- 3Category O36Maternal care for other known or suspected fetal problems
- 4Subcategory O36.0Maternal care for rhesus isoimmunization
- 5Subcategory O36.09Maternal care for rhesus isoimmunization, unspecified trimester
- 6Valid code O36.099Maternal care for rhesus isoimmunization, unspecified trimester, unspecified as to episode of care, or not applicable
Source and release
- Data release
- ICD-10-CA · FY 2026–2027
- Effective date
- Apr 1, 2026
- Publisher
- CIHI
This page is built from the ICD-10-CA catalog that Vero Codes reads when it suggests codes: Canadian Institute for Health Information’s FY 2026–2027 release, imported from the publisher’s file and checked against it. The description, notes and structured data come from the same record.
Frequently asked questions
What does ICD-10-CA code O36.099 mean?
O36.099 is the ICD-10-CA code for “Maternal care for rhesus isoimmunization, unspecified trimester, unspecified as to episode of care, or not applicable” in CIHI’s ICD-10-CA FY 2026–2027 release.
Where is O36.099 in ICD-10-CA?
O36.099 sits under O36.09 Maternal care for rhesus isoimmunization, unspecified trimester, within O36.0 Maternal care for rhesus isoimmunization, within O36 Maternal care for other known or suspected fetal problems, within O30-O48 Maternal care related to the fetus and amniotic cavity and possible delivery problems, within Chapter 15: Pregnancy, childbirth and the puerperium (O00-O99).
What coding notes apply to O36.099?
ICD-10-CA lists Includes, Excludes, Note notes for O36.099, including those from the headings it sits under. They are listed on this page with where each one comes from.
Which ICD-10-CA release does this page use?
It uses CIHI’s FY 2026–2027 release, in effect from Apr 1, 2026 to Mar 31, 2027. It is a reference: confirm the code against the current list and the payer’s rules before you submit it.