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O02.81

Inappropriate change in quantitative human chorionic gonadotropin (hCG) in early pregnancy

Billable FY2026 2025-10-01 → 2026-09-30
Exclusions 10 never code together
O02.8code
Excludes1
  • abnormal products of conception with blighted ovum (O02.0)O02.0
  • abnormal products of conception with hydatidiform mole (O01.-)O01.-
  • abnormal products of conception with nonhydatidiform mole (O02.0)O02.0
O02code
Excludes1
  • papyraceous fetus (O31.0-)O31.0-
O00-O08block
Excludes1
  • continuing pregnancy in multiple gestation after abortion of one fetus or more (O31.1-, O31.3-)O31.1-O31.3-
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.

Instructional notes 11
O02code
Use additional code
  • code from category O08 to identify any associated complication.O08
O02.81code
Inclusion terms
  • Biochemical pregnancy
  • Chemical pregnancy
  • Inappropriate level of quantitative human chorionic gonadotropin (hCG) for gestational age in early 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 2
  • Pregnancy (single) (uterine) Z33.1
  • Inappropriate
    • change in quantitative human chorionic gonadotropin (hCG) in early pregnancy O02.81
    • level of quantitative human chorionic gonadotropin (hCG) for gestational age in early pregnancy O02.81
Alongside this code 1 same parent — O02.8
O02.89 Other abnormal products of conception
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
yes
Code set
FY2026
Parent
O02.8
Block
O00-O08
Siblings
1

Present FY2024–FY2027.