O36.832

Maternal care for abnormalities of the fetal heart rate or rhythm, second trimester

Not billable — category only FY2026 2025-10-01 → 2026-09-30

Exclusions 8 never code together

O36code

Excludes1

encounter for suspected maternal and fetal conditions ruled out (Z03.7-)Z03.7-
placental transfusion syndromes (O43.0-)O43.0-

Excludes2

labor and delivery complicated by fetal stress (O77.-)O77.-

O00-O9Achapter

Excludes1

supervision of normal pregnancy (Z34.-)Z34.-

Excludes2

mental and behavioral disorders associated with the puerperium (F53.-)F53.-
obstetrical tetanus (A34)A34
postpartum necrosis of pituitary gland (E23.0)E23.0
puerperal osteomalacia (M83.0)M83.0

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

7th character 7

0 not applicable or unspecified

1 fetus 1

2 fetus 2 this code

3 fetus 3

4 fetus 4

5 fetus 5

9 other fetus

Instructional notes 8

O36code

Includes

the listed conditions in the fetus as a reason for hospitalization or other obstetric care of the mother, or for termination of pregnancy

O00-O9Achapter

Notes

CODES FROM THIS CHAPTER ARE FOR USE ONLY ON MATERNAL RECORDS, NEVER ON NEWBORN RECORDS
Codes from this chapter are for use for conditions related to or aggravated by the pregnancy, childbirth, or by the puerperium (maternal causes or obstetric causes)
Trimesters are counted from the first day of the last menstrual period. They are defined as follows:
1st trimester- less than 14 weeks 0 days
2nd trimester- 14 weeks 0 days to less than 28 weeks 0 days
3rd trimester- 28 weeks 0 days until delivery

Use additional code

code, if applicable, from category Z3A, Weeks of gestation, to identify the specific week of the pregnancy, if known.Z3A

Index entries leading here 1

Pregnancy (single) (uterine) Z33.1
- complicated by (care of) (management affected by)
  - abnormal, abnormality
    - fetal heart rate or rhythm O36.83
  - fetal (maternal care for)
    - bradycardia O36.83
    - depressed heart rate tones O36.83
    - heart rate irregularity (abnormal variability) (bradycardia) (decelerations) (tachycardia) O36.83
    - non-reassuring heart rate or rhythm O36.83

Alongside this code 3 same parent — O36.83

O36.831 Matern care for abnlt of fetal heart rate or rhym, first tri category O36.833 Matern care for abnlt of fetal heart rate or rhym, third tri category O36.839 Matern care for abnlt of fetal heart rate or rhym, unsp tri category

Subordinate codes 7

O36.8320 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, unsp O36.8321 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, fts1 O36.8322 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, fts2 O36.8323 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, fts3 O36.8324 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, fts4 O36.8325 Matern care for abnlt fetl hrt rate or rhym, 2nd tri, fts5 O36.8329 Matern care for abnlt of fetl hrt rate or rhym, 2nd tri, oth

Medications 1

5 Pregnancy Trimester, Second drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: no
Code set: FY2026
Parent: O36.83
Block: O30-O48
Siblings: 3
Subordinate: 7

Present FY2024–FY2027.