2026 ICD-10-CM Diagnosis Code Z84.AFamily history of exposure to diethylstilbestrol

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z84

ICD-10-CM Z84.A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z84.A is a billable ICD-10-CM diagnosis code for family history of exposure to diethylstilbestrol. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting.

Code Identity

ICD-10-CM Code
Z84.A
Billable Status
Yes — Valid for Submission
Code Describes
Family history of exposure to diethylstilbestrol
Short Description
Family history of exposure to diethylstilbestrol
Same as the full description in the CMS dataset.
Parent Code
Z84
Family history of other conditions

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ77-Z99Persons with potential health hazards related to family and personal history and certain conditions influencing health status
CategoryZ84Family history of other conditions
This CodeZ84.AFamily history of exposure to diethylstilbestrol

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z84.A.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z84.A is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • DES granddaughter or grandson
  • Family history of DES exposure
  • Third generation DES exposure

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • DES
      • grandchild (granddaughter) (grandson)
    • DES
      • third generation
    • History
      • family (of)
        • exposure to diethylstilbestrol (DES)

Code History & ChangesHistory

New Code Z84.A was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement Z84.A replaces the following previously assigned code(s):

  • Z84.89 - Family history of other specified conditions
FY 2026AddedAdded to the ICD-10-CM code setEffective October 1, 2025.
FY 2026CurrentRevised in the current code setEffective October 1, 2025 through September 30, 2026.

Questions About Z84.AOverview

Is Z84.A (Family history of other conditions) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report family history of exposure to diethylstilbestrol on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z84.A be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because family history of exposure to diethylstilbestrol describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z84.A exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for family history of exposure to diethylstilbestrol on inpatient claims.