2026 ICD-10-CM Diagnosis Code Z31.41Encounter for fertility testing

ICD-10-CM Codes›Z00–Z99›Z30-Z39›Z31

ICD-10-CM Z31.41
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z31.41 is a billable ICD-10-CM diagnosis code for encounter for fertility testing. 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. Coders also document this condition as infertility study done. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Contraceptive and procreative management.

Code Identity

ICD-10-CM Code
Z31.41
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for fertility testing
Short Description
Encounter for fertility testing
Same as the full description in the CMS dataset.
Parent Code
Z31.4
Encounter for procreative investigation and testing

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ30-Z39Persons encountering health services in circumstances related to reproduction
CategoryZ31Encounter for procreative management
This CodeZ31.41Encounter for fertility testing

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z31.41.

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

Z31.41 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infertility study done
  • Postcoital test abnormal

Tabular List NotesGuidance

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

Inclusion Terms

  • Encounter for fallopian tube patency testing
  • Encounter for sperm count for fertility testing

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.

    • Fallopian
      • insufflation
    • Insufflation, fallopian
    • Sperm counts(fertility testing)
    • Test, tests, testing(for)
      • fertility
    • Test, tests, testing(for)
      • procreative
        • fertility

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC013
Contraceptive and procreative management
Default principal diagnosis: inpatient No · outpatient Yes

Patient EducationClinical

Infertility

Infertility means not being able to become pregnant after a year of trying. If a woman can get pregnant but keeps having miscarriages or stillbirths, that's also called infertility.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert Z31.41 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V26.21 Fertility testing
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z31.41Overview

Is Z31.41 (Encounter for procreative investigation and testing) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report encounter for fertility testing on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z31.41 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because encounter for fertility testing describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z31.41 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 encounter for fertility testing on inpatient claims.

What is the ICD-9 equivalent of Z31.41?

Under the General Equivalence Mappings, encounter for fertility testing converts to ICD-9-CM V26.21 (fertility testing). The mapping is a direct match.