2026 ICD-10-CM Diagnosis Code Z11.2Encounter for screening for other bacterial diseases

ICD-10-CM Codes›Z00–Z99›Z00-Z13›Z11

ICD-10-CM Z11.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z11.2 is a billable ICD-10-CM diagnosis code for encounter for screening for other bacterial diseases. 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 Lyme not detected by enzyme-linked immunosorbent assay. 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
Z11.2
Billable Status
Yes — Valid for Submission
Code Describes
Encounter for screening for other bacterial diseases
Short Description
Encounter for screening for other bacterial diseases
Same as the full description in the CMS dataset.
Parent Code
Z11
Encounter for screening for infectious and parasitic diseases

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ00-Z13Persons encountering health services for examinations
CategoryZ11Encounter for screening for infectious and parasitic diseases
This CodeZ11.2Encounter for screening for other bacterial diseases

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z11.2.

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

Z11.2 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.

  • Lyme not detected by enzyme-linked immunosorbent assay
  • Lyme not detected by immunoblot

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.

    • Screening(for)
      • brucellosis
    • Screening(for)
      • diphtheria
    • Screening(for)
      • disease or disorder
        • bacterial NEC
    • Screening(for)
      • leprosy
    • Screening(for)
      • plague
    • Screening(for)
      • tetanus
    • Screening(for)
      • whooping cough

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 No · outpatient Yes

Patient EducationClinical

Health Screening

Screenings are tests that look for diseases before you have symptoms. Screening tests can find diseases early, when they're easier to treat. You can get some screenings in your doctor's office. Others need special equipment, so you may need to go to a different office or clinic.

Read the full article at MedlinePlus

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

Convert Z11.2 to ICD-9-CMHistory

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

ICD-9-CM
V74.2 Screening for leprosy
Approximate The match is approximate rather than exact.
ICD-9-CM
V74.3 Screening for diphtheria
Approximate The match is approximate rather than exact.
ICD-9-CM
V74.8 Screen-bacterial dis NEC
Approximate The match is approximate rather than exact.

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 Z11.2Overview

Is Z11.2 a billable code?

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

Can Z11.2 be a principal diagnosis?

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

Is Z11.2 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 screening for other bacterial diseases on inpatient claims.

What is the ICD-9 equivalent of Z11.2?

Under the General Equivalence Mappings, encounter for screening for other bacterial diseases converts to ICD-9-CM V74.2 (screening for leprosy), V74.3 (screening for diphtheria), and V74.8 (screen-bacterial dis NEC). The mapping is approximate, so confirm the match fits the documentation.