O36.191
⚠ Non-billable
Maternal care for other isoimmunization, first trimester
ICD-10-CM · FY2026 · Pregnancy, Childbirth and the Puerperium
Code
O36.191
System
ICD-10-CM
Billable
No — use specific code
Effective
FY2026
Chapter
Pregnancy, Childbirth and the Puerperium
Source
CMS / CDC NCHS
⚠ Verify before billing. Confirm against the current CMS/NCHS ICD-10-CM files and your payer's rules before claims submission.
Frequently asked questions
What is ICD-10 code O36.191?
ICD-10-CM code O36.191 represents Maternal care for other isoimmunization, first trimester. It is a non-billable header code requiring a more specific subcategory in the Pregnancy, Childbirth and the Puerperium chapter, effective October 1, 2025 – September 30, 2026.
Is O36.191 billable?
No. O36.191 is a non-billable header. Select a more specific subcategory for claims submission.
What chapter is O36.191 in?
O36.191 belongs to the Pregnancy, Childbirth and the Puerperium chapter (O00–O9A) of ICD-10-CM.
Related codes in the O36 category
O36
Maternal care for other fetal problems
Non-billable
O36.0
Maternal care for rhesus isoimmunization
Non-billable
O36.1
Maternal care for other isoimmunization
Non-billable
O36.2
Maternal care for hydrops fetalis
Non-billable
O36.4
Maternal care for intrauterine death
Non-billable
O36.5
Maternal care for known or suspected poor fetal growth
Non-billable
O36.6
Maternal care for excessive fetal growth
Non-billable
O36.7
Maternal care for viable fetus in abdominal pregnancy
Non-billable
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