2026 ICD-10-CM Diagnosis Code Z20.01Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)

ICD-10-CM Codes›Z00–Z99›Z20-Z29›suspected

ICD-10-CM Z20.01
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z20.01 is a billable ICD-10-CM diagnosis code for contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli). It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). Coders also document this condition as exposure to Escherichia coli. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Exposure, encounters, screening or contact with infectious disease.

Code Identity

ICD-10-CM Code
Z20.01
Billable Status
Yes — Valid for Submission
Code Describes
Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)
Short Description
Cntct w and expsr to intestnl infct dis d/t E coli (E. coli)
Parent Code
Z20.0
Contact with and (suspected) exposure to intestinal infectious diseases

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ20-Z29Persons with potential health hazards related to communicable diseases
CategorysuspectedContact with and exposure to communicable diseases (Z20)
This CodeZ20.01Contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli)

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Exposure to Escherichia coli

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.

    • Contact(with)
      • Escherichia coli (E. coli)
    • Contact(with)
      • intestinal infectious disease NEC
        • Escherichia coli (E. coli)
    • Exposure(to)
      • Escherichia coli (E. coli)
    • Exposure(to)
      • intestinal infectious disease NEC
        • Escherichia coli (E. coli)

Clinical ClassificationClinical

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

CCSR FAC016
Exposure, encounters, screening or contact with infectious disease
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

E. Coli Infections

E. coli is the name of a type of bacteria that lives in your intestines. Most types of E. coli are harmless. However, some types can make you sick and cause diarrhea. One type causes travelers' diarrhea. The worst type of E. coli causes bloody diarrhea, and can sometimes cause kidney failure and even death.

Read the full article at MedlinePlus

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

Convert Z20.01 to ICD-9-CMHistory

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

ICD-9-CM
V01.83 E. coli contact/exp
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 Z20.01Overview

Is Z20.01 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli) on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What is the ICD-9 equivalent of Z20.01?

Under the General Equivalence Mappings, contact with and (suspected) exposure to intestinal infectious diseases due to Escherichia coli (E. coli) converts to ICD-9-CM V01.83 (e. coli contact/exp). The mapping is a direct match.