Medicare Enrolled
Dr. Gregory Guzley, MD
Hematology & Oncology · San Antonio, TX
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. Guzley 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. Guzley
Dr. Gregory Guzley is a hematology & oncology specialist in San Antonio, TX, with 20 years of NPI registration. Based on federal Medicare data, Dr. Guzley performed 53,463 Medicare services across 1,789 unique beneficiaries.
Between the years covered by Open Payments, Dr. Guzley received a total of $14,482 from 66 pharmaceutical and/or device companies across 1003 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology & oncology. 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. Guzley is Very High — reflecting how much public federal data is available about this provider. This is not a quality rating. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 20 years in practice
▲ Top 17% volume in TX
$14,482 industry payments
Medicare Practice Summary
Medicare Utilization ↗53,463
Medicare services
Top 17% in TX for hematology & oncology
1,789
Unique beneficiaries
$4
Avg. Medicare payment
Medicare patients only (65+ / disabled) · Not a quality rating · How to read this →
~2,673 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. |
23,970 | $0 | $5 |
| Darbepoetin injection (Aranesp) for anemia An injection of darbepoetin alfa used for non-end-stage renal disease purposes. |
15,030 | $2 | $20 |
| Contrast dye for imaging (iodine-based) A contrast agent containing 300-399 mg/ml of iodine used to enhance imaging studies. It is administered per milliliter to improve the visibility of internal structures. |
6,372 | $0 | $3 |
| Immune globulin infusion (Octagam) This procedure involves the administration of immune globulin medication directly into a vein. It is provided in a non-lyophilized liquid form. |
1,580 | $33 | $233 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
762 | $8 | $20 |
| Comprehensive metabolic blood panel A blood test that measures a group of chemicals, including glucose, electrolytes, and kidney and liver function markers. |
743 | $10 | $64 |
| 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. |
717 | $8 | $36 |
| Immunoglobulin level test A blood test that measures the level of gammaglobulins, which are immune system proteins. |
474 | $9 | $56 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
408 | $0 | $1 |
| Ferritin level test (iron stores) A blood test that measures the level of ferritin, a protein that stores iron in the body. |
374 | $13 | $60 |
| Iron level test | 374 | $6 | $27 |
| 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. |
374 | $9 | $35 |
| Injection, granisetron hydrochloride, 100 mcg | 250 | $0 | $24 |
| 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. |
242 | $86 | $368 |
| 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. |
233 | $65 | $250 |
| Immunoglobulin light chain measurement A blood test that measures the levels of immunoglobulin light chains, which are proteins produced by plasma cells. |
228 | $17 | $60 |
| 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. |
129 | $11 | $96 |
| 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. |
115 | $22 | $157 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
107 | $15 | $100 |
| 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. |
97 | $48 | $313 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
93 | $55 | $211 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
79 | $97 | $707 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
62 | $11 | $108 |
| CT scan of chest with contrast A computed tomography scan of the chest using a contrast dye to enhance the visibility of internal structures. |
61 | $40 | $821 |
| Lactate dehydrogenase (LDH) level test A blood test that measures the amount of lactate dehydrogenase, an enzyme found in many body tissues. It helps assess tissue damage or disease. |
55 | $6 | $31 |
| 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. |
54 | $4 | $30 |
| CT scan of abdomen and pelvis with contrast A CT scan that uses dye to create detailed images of the abdomen and pelvis. This imaging test helps doctors examine internal organs and structures in these areas. |
53 | $155 | $1,067 |
| 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. |
53 | $4 | $22 |
| Complete blood count (CBC), automated An automated laboratory test that measures the levels of red blood cells, white blood cells, and platelets in the blood. |
53 | $6 | $34 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
53 | $1 | $7 |
| Reticulated platelet measurement A blood test that measures the level of young, newly formed platelets in the body. |
51 | $35 | $143 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
29 | $21 | $161 |
| 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. |
27 | $129 | $496 |
| Radiation therapy, 3+ areas, 11-19 MeV Delivery of high-energy radiation (11-19 MeV) to three or more separate treatment areas using custom blocking, tangential ports, wedges, rotational beams, and compensators. |
27 | $174 | $700 |
| Vitamin B-12 level test A blood test that measures the amount of vitamin B-12 in your body. |
22 | $15 | $76 |
| Intensity-modulated radiation therapy delivery Delivery of radiation therapy using narrow beams that are spatially and temporally modulated to target specific areas. This process is performed per treatment session. |
22 | $272 | $2,762 |
| Folic acid level test A blood test that measures the amount of folic acid in the serum. |
21 | $14 | $73 |
| Irrigation of implanted venous access device This procedure involves flushing an implanted venous access device to clear blockages or maintain patency. It ensures the device remains functional for delivering medications or fluids. |
20 | $19 | $114 |
| Office visit, established patient (10-19 min) An office visit for an existing patient lasting 10 to 19 minutes. The visit involves medical evaluation and management of the patient's condition. |
20 | $37 | $150 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
16 | $61 | $372 |
| CT scan of chest, without contrast A computed tomography scan of the chest area that uses X-rays to create detailed images without the use of contrast dye. |
13 | $36 | $686 |
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.
48.5% high complexity
42.3% medium
9.2% routine
Industry Payment Transparency
Open Payments through 2024 ↗$14,482
Total received (2018-2024)
Avg $2,069/year across 7 years
Top 25% in TX for hematology & oncology
66
Companies
1,003
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
$13,163 (90.9%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$881 (6.1%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$439 (3.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$30
2023
$30
2022
$349
2021
$159
2020
$1,377
2019
$6,898
2018
$5,637
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
AstraZeneca Pharmaceuticals LP
$1,221
Amgen Inc.
$1,152
Novartis Pharmaceuticals Corporation
$977
Genentech USA, Inc.
$770
GENZYME CORPORATION
$750
PFIZER INC.
$711
Merck Sharp & Dohme Corporation
$680
E.R. Squibb & Sons, L.L.C.
$670
Janssen Pharmaceuticals, Inc
$503
Janssen Biotech, Inc.
$499
Takeda Pharmaceuticals U.S.A., Inc.
$493
Incyte Corporation
$477
Celgene Corporation
$404
Astellas Pharma US Inc
$359
AbbVie, Inc.
$352
Bayer HealthCare Pharmaceuticals Inc.
$337
Alexion Pharmaceuticals, Inc.
$329
Eisai Inc.
$309
Lilly USA, LLC
$280
Ipsen Biopharmaceuticals, Inc
$274
Puma Biotechnology, Inc.
$230
Boehringer Ingelheim Pharmaceuticals, Inc.
$205
TESARO, Inc.
$184
Seattle Genetics, Inc.
$149
GlaxoSmithKline, LLC.
$135
Rigel Pharmaceuticals, Inc.
$134
EISAI INC.
$130
Daiichi Sankyo Inc.
$120
Taiho Oncology, Inc.
$105
Helsinn Therapeutics (U.S.), Inc.
$104
Jazz Pharmaceuticals Inc.
$102
Cardinal Health 110 LLC
$100
Exelixis Inc.
$97
JAZZ PHARMACEUTICALS INC.
$88
TerSera Therapeutics LLC
$71
Regeneron Healthcare Solutions, Inc.
$66
Lexicon Pharmaceuticals, Inc.
$60
TOLMAR Pharmaceuticals, Inc.
$57
AMAG Pharmaceuticals, Inc.
$56
Otsuka America Pharmaceutical, Inc.
$53
ARRAY BIOPHARMA INC
$48
Spectrum Pharmaceuticals Inc.
$48
EMD Serono, Inc.
$45
PUMA BIOTECHNOLOGY, INC.
$36
Teva Pharmaceuticals USA, Inc.
$35
Agios Pharmaceuticals, Inc.
$32
Apellis Pharmaceuticals, Inc.
$30
Medtronic USA, Inc.
$30
Array BioPharma Inc.
$29
Seagen Inc.
$29
Sandoz Inc.
$29
Pharmacyclics LLC, An AbbVie Company
$28
Foundation Medicine, Inc.
$26
Clovis Oncology, Inc.
$26
Gilead Sciences, Inc.
$25
Dova Pharmaceuticals
$24
EUSA Pharma (US) LLC
$23
Octapharma USA, Inc.
$22
R-Pharm US LLC
$21
SANOFI-AVENTIS U.S. LLC
$20
INSYS Therapeutics Inc
$17
Alnylam Pharmaceuticals Inc.
$15
Karyopharm Therapeutics Inc.
$13
Dendreon Pharmaceuticals LLC
$13
Advanced Accelerator Applications
$12
Kyowa Kirin, Inc.
$11
Top 3 companies account for 23.1% of total payments
Associated products mentioned in payments ›
ADCETRIS · AFINITOR · AKYNZEO · ALIMTA · ALOXI · Abraxane · Alecensa · Aliqopa · Avastin · BALVERSA · BAVENCIO · BENDEKA · BLENREP · BOSULIF · BRAFTOVI · Balversa · Bavencio · Blincyto · Braftovi · CABLIVI · CALQUENCE · CYRAMZA · Cabometyx · DARZALEX · Doptelet · ELIGARD · ELIQUIS · ELITEK · EMEND · EMPLICITI · ERBITUX · ERLEADA · Empaveli · Enhertu · Erleada · FARESTON · FERAHEME · FOUNDATIONONE · Folotyn · GAZYVA · GILOTRIF · GIVLAARI · Halaven · IBRANCE · IDHIFA · IMBRUVICA · IMFINZI · INJECTAFER · INLYTA · Imbruvica · Inrebic · Ixempra · JADENU · JAKAFI · JEVTANA · KANJINTI · KEYTRUDA · KISQALI · Kyprolis · LIBTAYO · LIBTAYO CEMIPLIMAB-RWLC INJECTION · LUMAKRAS · LYNPARZA · Lenvima · Lonsurf · Lupron · Lupron Depot · Lutathera · MEKINIST · MVASI · MYLOTARG · NERLYNX · NINLARO · Nerlynx · Neulasta · Nexavar · Nplate · OPDIVO · OSTEOCOOL RF ABLATION · Onivyde · PADCEV · PIQRAY · PROMACTA · PROVENGE · Perjeta · Pomalyst · RYDAPT · Revlimid · Rituxan Hycela · Rubraca · SANDOSTATIN · SOLIRIS · SOMATULINE DEPOT · SPRYCEL · SUTENT · SYNDROS · Stivarga · Sylvant · TAGRISSO · TASIGNA · TECENTRIQ · Tavalisse · ULTOMIRIS · VENCLEXTA · VOTRIENT · VYXEOS · Vectibix · Venclexta · Vitrakvi · WILATE · XALKORI · XARELTO · XGEVA · XOSPATA · XPOVIO · XTANDI · Xermelo · Xofigo · ZARXIO · ZEJULA · ZOLADEX · ZYKADIA
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 (91%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Equivalent to $27 per 100 Medicare services performed
Geographic Context
Hematology & oncology specialists within 10 mi
56
Per 100K population
2.7
County median income
$70,571
Nearest hospital
UNIVERSITY HEALTH SYSTEM
0.0 mi
0.0 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 measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Guzley is a mixed practice specialist, with above-average Medicare volume (top 17% in TX), with low-engagement industry engagement, with 20 years of NPI registration.
This summary is auto-generated from federal data. It describes data availability and patterns — not clinical quality. Read our methodology →
Frequently Asked Questions
Is Dr. Guzley experienced with iron infusion (feraheme)?
Based on Medicare claims data, Dr. Guzley performed 23,970 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. Guzley receive payments from pharmaceutical companies?
Yes. Dr. Guzley received a total of $14,482 from 66 companies across 1,003 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. Guzley's costs compare to other hematology & oncology specialists in San Antonio?
Dr. Guzley's average Medicare payment per service is $4. 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. Guzley) 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. The Transparency Score measures 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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