Dr. Barry Zeffren, MD
What this data tells you about Dr. Zeffren
Dr. Barry Zeffren is an allergy & immunology specialist in Glen Carbon, IL, with 19 years of NPI registration. Based on federal Medicare data, Dr. Zeffren performed 3,534 Medicare services across 265 unique beneficiaries.
Between the years covered by Open Payments, Dr. Zeffren received a total of $19,130 from 25 pharmaceutical and/or device companies across 210 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in allergy & immunology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Zeffren is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
Medicare Practice Summary
Medicare Utilization ↗Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Allergy skin test A diagnostic test performed to identify specific allergies by applying or introducing allergenic extracts to the body. The procedure measures the patient's immune response to various potential allergens. |
2,254 | $3 | $10 |
| Allergy skin patch test A diagnostic test where small amounts of potential allergens are applied to the skin to identify substances that cause an allergic reaction. |
997 | $4 | $22 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
187 | $61 | $130 |
| New patient office visit, complex (60-74 min) | 58 | $156 | $395 |
| Expiratory airflow and volume test A test that measures the amount of air you can exhale and the speed at which you can breathe it out. It evaluates lung function by assessing expiratory airflow and volume. |
27 | $19 | $110 |
| Spirometry test before and after medication A test that measures the amount of air you can exhale and the speed of your breathing before and after taking a medication. |
11 | $29 | $190 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
All-time payments by company (2018-2024) ›
Associated products mentioned in payments ›
The majority of payments (86%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in allergy & immunology and does not inherently indicate bias, but patients may wish to be aware.
Geographic Context
2.1 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Zeffren is a mixed practice specialist, with above-average Medicare volume (top 21% in IL), with speaking/promotional industry engagement in the top 16% of IL peers, with 19 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
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All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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