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Allergy/Immunology

Barry Zeffren, MD

Sees patients in Alton, IL · Glen Carbon, IL · Illinois

Summary

Barry Zeffren, MD (Allergy/Immunology) is enrolled with Medicare at 2 practice locations in Alton, IL and Glen Carbon, IL. NPI 1205908639. Medicare data says the clinician accepts Medicare assignment. Source: CMS National Downloadable File, updated 2026-10-02.

Call(618) 462‑4888 NPI Registry record Medicare profile

From official Medicare data

This page shows what Medicare's official clinician data says about Barry Zeffren, joined by NPI number (data updated 2026-10-02). It is not a recommendation or a rating. Call the office or hospital to confirm before you go.

In a medical emergency, call 911.

At a glance

2Practice locations
Allergy/ImmunologyPrimary specialty
YesAccepts Medicare assignment
47Years since medical school (graduated 1979)
Saint Louis University School Of MedicineMedical school
MaleGender (as listed)

Quick answers

Where does Barry Zeffren see patients?
Medicare's clinician data lists 2 practice locations, including Alton, IL and Glen Carbon, IL. Call before your visit to confirm the address.
What is Barry Zeffren's specialty?
Medicare lists Allergy/Immunology as the primary specialty.
Does Barry Zeffren accept Medicare assignment?
Yes. Medicare's clinician data says Barry Zeffren accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
What is the phone number for Barry Zeffren?
(618) 462-4888, as listed in official Medicare / NPI Registry data.
What is Barry Zeffren's NPI number?
1205908639. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.

Practice locations

Addresses where Barry Zeffren is enrolled with Medicare (CMS data updated 2026-10-02).

Specialties

Find other Allergy/Immunology doctors in Illinois →

Other allergist and immunologists in Illinois

Clinicians with the same Medicare primary specialty in Illinois — not a recommendation.

All allergist and immunologists in Illinois →

Clinician information

CredentialMD
Medical schoolSaint Louis University School Of Medicine
Graduation year1979
Gender (as listed)Male
Medicare assignmentAccepts (Medicare-approved amount as full payment)
NPI (National Provider Identifier)1205908639
CorrectionsReport an error or suggest an update →

Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.

Sources

  1. National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
  2. NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
  3. Medicare Care Compare — official Medicare tool to look up clinicians