Medicare Enrolled
Tammy Zweeres, APN
Nurse Practitioner - Family · Romeoville, 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 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 Zweeres?
Request a correction or review of any data shown here. Provider portal →
What this data tells you about Zweeres
Tammy Zweeres is a nurse practitioner - family in Romeoville, IL, with 14 years of NPI registration. Based on federal Medicare data, Zweeres performed 10,057 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Zweeres received a total of $4,838 from 51 pharmaceutical and/or device companies across 204 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 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 of NPI registration
▲ Top 1% volume in IL
$4,838 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗10,057
Medicare services
Top 1% in IL for nurse practitioner - family
Not available
Unique patients (not deduplicated)
$5
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 |
|---|---|---|---|
| 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. These counts do not measure clinical quality or years of experience.
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
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
$1,661
2023
$1,116
2022
$1,924
2021
$136
Payments by company (2024)
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? 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
Family nurse practitioners in nearby ZIP areas
1,891
County median income
$107,799
Nearest hospital to ZIP centroid (approximate)
UCHICAGO MEDICINE ADVENTHEALTH BOLINGBROOK
4.8 mi
4.8 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
Zweeres 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 Zweeres experienced with iron infusion (feraheme)?
Based on Medicare claims data, Zweeres performed 7,140 iron infusion (feraheme) services. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Zweeres receive payments from pharmaceutical companies?
Yes. Zweeres received a total of $4,838 from 51 companies across 204 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 Zweeres's costs compare to other family nurse practitioners in Romeoville?
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 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 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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