Medicare Enrolled
Dr. Tammy Zweeres, APN
Nurse Practitioner - Family · Romeoville, IL
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Low-engagement
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. Zweeres 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 →
Are you Dr. Zweeres?
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What this data tells you about Dr. Zweeres
Dr. Tammy Zweeres is a nurse practitioner - family in Romeoville, IL, with 14 years of NPI registration. Based on federal Medicare data, Dr. Zweeres performed 10,057 Medicare services across 1,030 unique beneficiaries.
Between the years covered by Open Payments, Dr. Zweeres received a total of $4,838 from 51 pharmaceutical and/or device companies across 204 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in nurse practitioner - family. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Zweeres 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.
✓ 14 years in practice
▲ Top 1% volume in IL
$4,838 industry payments
Medicare Practice Summary
Medicare Utilization ↗10,057
Medicare services
Top 1% in IL for nurse practitioner - family
1,030
Unique beneficiaries
$5
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~718 Medicare services per year of practice
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 |
|---|---|---|---|
| Iron infusion (Feraheme) An injection of ferumoxytol used to treat iron deficiency anemia in patients not on dialysis. |
7,140 | $0 | $3 |
| Epoetin alfa injection (Retacrit) for anemia An injection of a biosimilar form of epoetin alfa used for non-end-stage renal disease purposes. The dose administered is 1000 units. |
1,220 | $6 | $22 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
272 | $0 | $1 |
| 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. |
270 | $70 | $229 |
| Complete blood count (CBC) with differential An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood, including a breakdown of the different types of white blood cells. |
192 | $8 | $40 |
| 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. |
185 | $50 | $157 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
177 | $10 | $55 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
174 | $8 | $20 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
64 | $11 | $54 |
| 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. |
53 | $9 | $62 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
47 | $13 | $70 |
| Iron level test | 45 | $6 | $33 |
| Iron binding capacity test A blood test that measures the amount of iron in the blood and the blood's ability to bind and transport iron. |
45 | $9 | $45 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
40 | $88 | $380 |
| Prothrombin time test (blood clotting) A laboratory test that measures how long it takes for blood to clot. This procedure evaluates the body's coagulation process. |
23 | $4 | $20 |
| 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. |
23 | $43 | $201 |
| 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. |
23 | $20 | $95 |
| Manual white blood cell count A laboratory test that involves examining a sample under a microscope to manually count the number of white blood cells present. |
21 | $4 | $18 |
| Thyroid stimulating hormone (TSH) test A blood test that measures the level of thyroid stimulating hormone to evaluate thyroid function. |
15 | $16 | $86 |
| Carcinoembryonic antigen (CEA) level test A blood test that measures the level of carcinoembryonic antigen (CEA) protein. This test is used to monitor certain types of cancer. |
14 | $19 | $97 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
14 | $15 | $77 |
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. A higher procedure volume generally indicates more experience with that procedure.
71.9% high complexity
16.0% medium
12.2% routine
Industry Payment Transparency
Open Payments through 2024 ↗$4,838
Total received (2021-2024)
Avg $1,209/year across 4 years
Top 5% in IL for nurse practitioner - family
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
51
Companies
204
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$3,866 (79.9%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$971 (20.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,661
2023
$1,116
2022
$1,924
2021
$136
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Novartis Pharmaceuticals Corporation
$194
Janssen Biotech, Inc.
$190
Genentech USA, Inc.
$172
PFIZER INC.
$116
Takeda Pharmaceuticals U.S.A., Inc.
$109
AstraZeneca Pharmaceuticals LP
$105
Merck Sharp & Dohme LLC
$73
Astellas Pharma US Inc
$63
Daiichi Sankyo Inc.
$53
Eisai Inc.
$46
Lilly USA, LLC
$46
Fennec Pharmaceuticals, Inc.
$43
Gilead Sciences, Inc.
$43
ABBVIE INC.
$40
PUMA BIOTECHNOLOGY, INC.
$40
Ipsen Biopharmaceuticals, Inc
$36
Incyte Corporation
$33
E.R. Squibb & Sons, L.L.C.
$30
EMD Serono, Inc.
$27
Pharmacosmos Therapeutics Inc.
$24
Coherus Biosciences Inc.
$24
Blueprint Medicines Corporation
$23
Mirati Therapeutics, Inc.
$22
Alexion Pharmaceuticals, Inc.
$20
SOBI, INC
$20
GlaxoSmithKline, LLC.
$19
BTG International, Inc.
$18
Bayer Healthcare Pharmaceuticals Inc.
$18
Novocure Inc.
$14
Top 3 companies account for 33.5% of 2024 payments
All-time payments by company (2021-2024) ›
AstraZeneca Pharmaceuticals LP
$473
Lilly USA, LLC
$457
Novartis Pharmaceuticals Corporation
$416
Janssen Biotech, Inc.
$331
Astellas Pharma US Inc
$320
Incyte Corporation
$289
Genentech USA, Inc.
$241
PFIZER INC.
$227
Takeda Pharmaceuticals U.S.A., Inc.
$213
Daiichi Sankyo Inc.
$193
E.R. Squibb & Sons, L.L.C.
$122
EISAI INC.
$110
Merck Sharp & Dohme LLC
$107
Gilead Sciences, Inc.
$104
ABBVIE INC.
$101
GlaxoSmithKline, LLC.
$80
Ipsen Biopharmaceuticals, Inc
$76
Eisai Inc.
$70
GENZYME CORPORATION
$67
Myriad Genetic Laboratories, Inc.
$63
Organon LLC
$47
Pharmacyclics LLC, an AbbVie Company
$45
Pharmacyclics LLC, An AbbVie Company
$45
Fennec Pharmaceuticals, Inc.
$43
G1 Therapeutics, Inc.
$40
PUMA BIOTECHNOLOGY, INC.
$40
Rigel Pharmaceuticals, Inc.
$40
EMD Serono, Inc.
$27
Seagen Inc.
$27
Janssen Pharmaceuticals, Inc
$25
SERVIER PHARMACEUTICALS LLC
$25
Pharmacosmos Therapeutics Inc.
$24
Coherus Biosciences Inc.
$24
Blueprint Medicines Corporation
$23
Alnylam Pharmaceuticals Inc.
$22
Mirati Therapeutics, Inc.
$22
Celgene Corporation
$22
MorphoSys, US Inc.
$21
Alexion Pharmaceuticals, Inc.
$20
SOBI, INC
$20
Apellis Pharmaceuticals, Inc.
$20
BTG International, Inc.
$18
Bayer Healthcare Pharmaceuticals Inc.
$18
Currax Pharmaceuticals LLC
$17
Verity Pharmaceuticals Inc.
$16
Regeneron Healthcare Solutions, Inc.
$16
BeiGene USA, Inc.
$15
Novocure Inc.
$14
Kite Pharma, Inc.
$14
Amgen Inc.
$14
Epizyme, Inc.,
$14
Top 3 companies account for 27.8% of all-time payments
Associated products mentioned in payments ›
ADAKVEO · ALUNBRIG · AYVAKIT · BOSULIF · BRUKINSA · CALQUENCE · CARVYKTI · COSELA · CYRAMZA · DARZALEX · ELIQUIS · ENHERTU · ENJAYMO · EPKINLY · ERLEADA · EVENITY · Empaveli · Enhertu · Fabhalta · GIVLAARI · IBRANCE · IMBRUVICA · IMFINZI · INJECTAFER · INLYTA · JAKAFI · JAYPIRCA · JEVTANA · KEYTRUDA · KISQALI · KRAZATI · Kadcyla · LIBTAYO · LUPRON DEPOT · LUTATHERA · LYNPARZA · Lenvima · MEKINIST · MONJUVI · NINLARO · Nubeqa · OJJAARA · ONTRUZANT · ONZETRA XSAIL · OPDIVO · OPDUALAG · Ocrevus · Onivyde · Optune Lua (NovoTTF-200T) · PADCEV · PEMAZYRE · PIQRAY · PROMACTA · Padcev · Pedmark · Polivy · Pomalyst · PreciseTumor · RYBREVANT · SCEMBLIX · SHINGRIX · SOMATULINE DEPOT · TAGRISSO · TAZVERIK · Tavalisse · Tazverik · Tecentriq · Tecentriq Hybreza · Tibsovo · Trelstar · Trodelvy · ULTOMIRIS · Udenyca · VENCLEXTA · VERZENIO · VONJO · Venclexta · Vistogard · WELIREG · XARELTO · Xospata · ZEJULA · myRisk
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. 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 →
Most payments (80%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians. Total industry engagement is in the top 5% for nurse practitioner - family in IL.
Geographic Context
Family nurse practitioners within 10 mi
1,891
Per 100K population
270.7
County median income
$107,799
Nearest hospital
UCHICAGO MEDICINE ADVENTHEALTH BOLINGBROOK
4.8 mi
4.8 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. Zweeres is a mixed practice specialist, with above-average Medicare volume (top 1% in IL), with low-engagement industry engagement in the top 5% of IL peers.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Zweeres experienced with iron infusion (feraheme)?
Based on Medicare claims data, Dr. Zweeres performed 7,140 iron infusion (feraheme) services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Zweeres receive payments from pharmaceutical companies?
Yes. Dr. Zweeres received a total of $4,838 from 51 companies across 204 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. 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. Zweeres's costs compare to other family nurse practitioners in Romeoville?
Dr. Zweeres's average Medicare payment per service is $5. 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. Zweeres) 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 a long track record of practice, Medicare participation, and industry disclosure. 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?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
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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