2026 ICD-10-CM Diagnosis Code Z85.4APersonal history of malignant neoplasm of fallopian tube(s)

ICD-10-CM Codes›Z00–Z99›Z77-Z99›Z85

ICD-10-CM Z85.4A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z85.4A is a billable ICD-10-CM diagnosis code for personal history of malignant neoplasm of fallopian tube(s). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 826 through 830, 843 through 845. 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
Z85.4A
Billable Status
Yes — Valid for Submission
Code Describes
Personal history of malignant neoplasm of fallopian tube(s)
Short Description
Personal history of malignant neoplasm of fallopian tube(s)
Same as the full description in the CMS dataset.
Parent Code
Z85.4
Personal history of malignant neoplasm of genital organs

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
CategoryZ85Personal history of malignant neoplasm
This CodeZ85.4APersonal history of malignant neoplasm of fallopian tube(s)

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z85.4A.

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

Z85.4A is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

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.

    • History
      • personal (of)
        • malignant neoplasm (of)
          • fallopian tube (s)

Code History & ChangesHistory

New Code Z85.4A was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement Z85.4A replaces the following previously assigned code(s):

  • Z85.44 - Personal history of malig neoplasm of female genital organs
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 Z85.4AOverview

Is Z85.4A (Personal history of malignant neoplasm of genital organs) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report personal history of malignant neoplasm of fallopian tube(s) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does Z85.4A group to?

On inpatient claims, personal history of malignant neoplasm of fallopian tube(s) maps to MS-DRG 826, 827, 828, 829, 830, 843, 844, 845, with relative weights from 0.8516 to 4.6778 depending on complications. Higher weights mean higher Medicare reimbursement.

Can Z85.4A be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because personal history of malignant neoplasm of fallopian tube(s) describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z85.4A 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 personal history of malignant neoplasm of fallopian tube(s) on inpatient claims.