Medicare Enrolled
Dr. Brett Herzog, MD PHD
Internal Medicine · Shiloh, IL
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Herzog from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Herzog
Dr. Brett Herzog is an internal medicine specialist in Shiloh, IL, with 11 years of NPI registration. Based on federal Medicare data, Dr. Herzog performed 52,204 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Herzog received a total of $1,184 from 11 pharmaceutical and/or device companies across 16 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Herzog 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.
✓ 11 years of NPI registration
▲ Top 1% volume in IL
$1,184 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗52,204
Medicare services
Top 1% in IL for internal medicine
Not available
Unique patients (not deduplicated)
$36
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
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 |
|---|---|---|---|
| Pembrolizumab injection (Keytruda) | 25,600 | $37 | $117 |
| Injection, durvalumab, 10 mg | 12,534 | $62 | $165 |
| Anti-nausea injection (fosaprepitant) An injection of fosaprepitant, a medication used to prevent nausea and vomiting. |
8,700 | $0 | $5 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
1,530 | $0 | $4 |
| Anti-nausea injection (Aloxi/palonosetron) | 1,060 | $1 | $61 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
738 | $2 | $27 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
435 | $97 | $594 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
253 | $97 | $236 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
236 | $12 | $142 |
| Additional sequential IV infusion, 1 hour or less This code represents an additional intravenous infusion administered sequentially to a primary infusion. It covers the administration time of one hour or less. |
179 | $22 | $203 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
103 | $11 | $69 |
| Intravenous infusion of new drug or substance, 1 hour or less This procedure involves administering a new medication or substance directly into a vein through an existing access site. The infusion is completed within one hour or less. |
103 | $50 | $277 |
| Normal saline infusion, 1000 cc Administration of 1000 cc of normal saline solution into a vein. This procedure involves the intravenous delivery of a sterile saltwater solution. |
69 | $2 | $31 |
| Intravenous infusion, 1 hour or less Administration of medication or fluid directly into a vein for therapeutic, preventive, or diagnostic purposes. The procedure lasts one hour or less. |
62 | $48 | $225 |
| Intravenous push injection of new drug or substance A healthcare provider injects a new medication or substance directly into a vein using a push technique. |
62 | $42 | $247 |
| Office visit, established patient, complex (40-54 min) An office or outpatient visit for an existing patient lasting between 40 and 54 minutes. This level of service is determined by the total time spent on the date of the encounter. |
54 | $139 | $348 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
49 | $1 | $30 |
| Additional hour of intravenous hydration This code represents each additional hour of intravenous fluid administration beyond the initial hour. It is used to bill for extended hydration therapy. |
47 | $10 | $125 |
| Injection, alteplase recombinant, 1 mg | 43 | $66 | $179 |
| Unclassified drug A medication that does not fit into standard HCPCS or CPT classification categories. |
43 | $1 | $20 |
| Blood or blood product transfusion The administration of whole blood or specific blood components into a patient's bloodstream. |
40 | $30 | $235 |
| Hospital follow-up visit, moderate complexity Follow-up hospital visit for an existing patient involving moderate medical decision making. The visit requires at least 35 minutes of time spent on the date of service. |
38 | $64 | $210 |
| Intravenous hydration infusion, 31-60 minutes Administration of fluids into a vein to maintain hydration. This procedure involves an infusion lasting between 31 and 60 minutes. |
35 | $25 | $214 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
34 | $102 | $420 |
| Blood sample collection from implanted device This procedure involves drawing a blood sample directly from a medical device that has been surgically placed in the body. |
29 | $20 | $159 |
| Concurrent intravenous infusion Administration of medication or fluid into a vein for therapy, prevention, or diagnosis while another infusion is being given. |
26 | $15 | $125 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
26 | $1 | $20 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
23 | $131 | $392 |
| Central venous tube declotting A procedure to clear a blockage or clot from a central venous catheter to restore its function. |
21 | $24 | $142 |
| Leukocyte-reduced red blood cell unit A unit of red blood cells that has been processed to remove white blood cells (leukocytes) before transfusion. |
19 | $56 | $335 |
| New patient office visit, complex (60-74 min) | 13 | $178 | $500 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. These counts do not measure clinical quality or years of experience.
1.8% high complexity
97.1% medium
1.1% routine
Industry Payment Transparency
Open Payments through 2024 ↗$1,184
Total received (2018-2024)
Avg $237/year across 5 years
Top 29% in IL for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
11
Companies
16
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$163
2023
$84
2021
$40
2019
$382
2018
$517
Payments by company (2024)
Galvanize Therapeutics, Inc
$146
Tempus AI, Inc
$16
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
Merck Sharp & Dohme Corporation
$316
Astellas Pharma US Inc
$200
Galvanize Therapeutics, Inc
$146
Genentech, Inc.
$122
Janssen Biotech, Inc.
$100
Amgen Inc.
$100
Incyte Corporation
$99
JAZZ PHARMACEUTICALS INC.
$40
ABBVIE INC.
$29
Tempus AI, Inc
$16
Pharmacyclics LLC, An AbbVie Company
$16
Top 3 companies account for 55.9% of all-time payments
Associated products mentioned in payments ›
ALIYA SYSTEM · Alecensa · IMBRUVICA · KEYTRUDA · Non-Covered Product · VENCLEXTA · ZEPZELCA
Should you be concerned? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Geographic Context
Internal medicine physicians in nearby ZIP areas
1,143
County median income
$70,178
Nearest hospital to ZIP centroid (approximate)
HSHS ST ELIZABETH'S HOSPITAL
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | 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. Herzog is a mixed practice specialist, with above-average Medicare volume (top 1% in IL).
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Herzog experienced with pembrolizumab injection (keytruda)?
Based on Medicare claims data, Dr. Herzog performed 25,600 pembrolizumab injection (keytruda) services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Herzog receive payments from pharmaceutical companies?
Yes. Dr. Herzog received a total of $1,184 from 11 companies across 16 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Herzog's costs compare to other internal medicine physicians in Shiloh?
Dr. Herzog's average Medicare payment per service is $36. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Herzog) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: 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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