Medicare Enrolled
Dr. Ghassan Zalzaleh, MD
Hematology & Oncology · Oak Lawn, IL
Practice pattern: Mixed Practice
— Diverse clinical practice across multiple procedure types
Consulting-driven
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. Zalzaleh 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. Zalzaleh
Dr. Ghassan Zalzaleh is a hematology & oncology specialist in Oak Lawn, IL, with 20 years of NPI registration. Based on federal Medicare data, Dr. Zalzaleh performed 212,579 Medicare services across 2,828 unique beneficiaries.
Between the years covered by Open Payments, Dr. Zalzaleh received a total of $45,630 from 92 pharmaceutical and/or device companies across 1020 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in hematology & oncology. The majority of payments are for consulting, which typically reflects recognized clinical expertise sought by manufacturers. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Zalzaleh 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.
✓ 20 years in practice
▲ Top 4% volume in IL
$45,630 industry payments
Medicare Practice Summary
Medicare Utilization ↗212,579
Medicare services
Top 4% in IL for hematology & oncology
2,828
Unique beneficiaries
$15
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~10,629 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 |
|---|---|---|---|
| Pembrolizumab injection (Keytruda) | 39,200 | $43 | $146 |
| Iron infusion (Injectafer) An intravenous injection of ferric carboxymaltose, an iron replacement medication. |
30,000 | $1 | $5 |
| Anti-nausea injection (fosaprepitant) An injection of fosaprepitant, a medication used to prevent nausea and vomiting. |
23,850 | $0 | $7 |
| Filgrastim injection (Nivestym) for white blood cells An injection of the biosimilar medication filgrastim-aafi (Nivestym) at a dose of 1 microgram. |
17,940 | $0 | $6 |
| Darbepoetin injection (Aranesp) for anemia An injection of darbepoetin alfa used for non-end-stage renal disease purposes. |
16,200 | $2 | $21 |
| Oxaliplatin chemotherapy injection This procedure involves the administration of oxaliplatin, a chemotherapy medication, via injection. The dosage specified is 0.5 mg. |
15,600 | $0 | $36 |
| Filgrastim injection (Zarxio) for white blood cells An injection of the biosimilar medication filgrastim-sndz (Zarxio) with a dosage of 1 microgram. |
12,780 | $0 | $2 |
| Paclitaxel protein-bound particle injection An injection of paclitaxel formulated as protein-bound particles. This code specifies the administration of the medication measured in milligrams. |
10,500 | $10 | $43 |
| Denosumab injection (Prolia/Xgeva) | 9,420 | $18 | $70 |
| Paclitaxel chemotherapy injection | 7,020 | $0 | $3 |
| Injection, docetaxel, 1 mg | 4,529 | $0 | $71 |
| Injection, atezolizumab, 10 mg | 4,080 | $64 | $229 |
| Dexamethasone injection (steroid) An injection of dexamethasone sodium phosphate, a corticosteroid medication, administered in a dose of 1 milligram. |
2,690 | $0 | $4 |
| Rituximab-pvvr biosimilar injection, 10 mg An injection of rituximab-pvvr, a biosimilar medication, administered in a 10 mg dose. |
2,280 | $21 | $194 |
| Anti-nausea injection (Aloxi/palonosetron) | 2,020 | $1 | $122 |
| Injection, atropine sulfate, 0.01 mg | 1,920 | $0 | $2 |
| Bortezomib injection, 0.1 mg Administration of a 0.1 mg dose of bortezomib medication via injection. |
1,820 | $4 | $124 |
| Injection, granisetron hydrochloride, 100 mcg | 1,500 | $0 | $25 |
| 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. |
840 | $96 | $400 |
| Intravenous chemotherapy infusion, 1 hour or less Administration of chemotherapy medication directly into a vein. The procedure takes one hour or less to complete. |
705 | $107 | $686 |
| Intravenous injection of additional new drug or substance Administration of an additional new medication or substance directly into a vein. |
651 | $12 | $105 |
| Carboplatin chemotherapy injection, 50 mg Administration of a 50 mg dose of carboplatin, a chemotherapy medication, via injection. |
629 | $2 | $300 |
| Injection, gemcitabine hydrochloride, not otherwise specified, 200 mg | 570 | $3 | $401 |
| Injection, leucovorin calcium, per 50 mg | 527 | $3 | $88 |
| Pegfilgrastim injection, 0.5 mg An injection of pegfilgrastim, a medication that stimulates the production of white blood cells. This specific code applies to the brand-name drug and excludes biosimilar versions. |
492 | $78 | $1,444 |
| 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. |
445 | $23 | $152 |
| 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. |
390 | $11 | $93 |
| Fluorouracil injection, 500 mg Administration of a 500 mg dose of fluorouracil medication via injection. |
371 | $2 | $14 |
| Pegfilgrastim-apgf injection An injection of pegfilgrastim-apgf, a biosimilar medication. The dose specified is 0.5 mg. |
360 | $92 | $879 |
| Zoledronic acid injection, 1 mg An injection of zoledronic acid administered at a dose of 1 mg. |
249 | $7 | $462 |
| Piflufolastat F-18 diagnostic injection A diagnostic injection of the radioactive tracer piflufolastat F-18 used for imaging. The dose specified is 1 millicurie. |
218 | $487 | $1,380 |
| Magnesium sulfate injection, per 500 mg An injection of magnesium sulfate administered in 500 mg increments. |
216 | $1 | $6 |
| Additional hour of intravenous chemotherapy This code represents the administration of chemotherapy medication into a vein for each additional hour beyond the initial period. |
212 | $23 | $156 |
| 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. |
195 | $52 | $334 |
| 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. |
166 | $66 | $270 |
| 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. |
158 | $64 | $270 |
| Diphenhydramine injection, up to 50 mg An injection of diphenhydramine hydrochloride, an antihistamine medication, administered in a dose of up to 50 milligrams. |
146 | $1 | $7 |
| 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. |
139 | $52 | $304 |
| Nuclear medicine scan from skull base to mid-thigh with CT A nuclear medicine imaging study covering the area from the base of the skull to the middle of the thighs, performed alongside a CT scan. |
136 | $1,298 | $4,120 |
| Anti-nausea injection (ondansetron/Zofran) | 132 | $0 | $5 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 114 | $411 | $638 |
| 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. |
104 | $140 | $530 |
| Non-hormonal chemotherapy injection This procedure involves administering non-hormonal anti-neoplastic chemotherapy medication via injection into the skin or muscle tissue. |
103 | $60 | $205 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
88 | $1 | $19 |
| Leuprolide acetate (for depot suspension), 7.5 mg | 81 | $134 | $3,938 |
| Unclassified drug A medication that does not fit into standard HCPCS or CPT classification categories. |
67 | $3 | $21 |
| Initial hospital admission, high complexity Initial hospital inpatient or observation care for a new patient involving high-level medical decision making, with at least 75 minutes total time on the date of the encounter. |
64 | $145 | $750 |
| 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. |
59 | $45 | $281 |
| 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. |
57 | $21 | $90 |
| Concurrent intravenous infusion Administration of medication or fluid into a vein for therapy, prevention, or diagnosis while another infusion is being given. |
55 | $16 | $91 |
| Hospital follow-up visit, high complexity Subsequent hospital inpatient or observation care for an existing patient involving high-level medical decision making, with at least 50 minutes total time on the date of the encounter. |
49 | $99 | $380 |
| New patient office visit, complex (60-74 min) | 41 | $175 | $760 |
| On-body injector for subcutaneous injection A device is applied to the skin to automatically deliver a medication injection under the skin. |
40 | $15 | $49 |
| 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. |
39 | $27 | $249 |
| Additional hour of intravenous infusion This code represents each additional hour of intravenous infusion beyond the initial hour for therapy, prevention, or diagnosis. |
39 | $17 | $97 |
| 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. |
39 | $2 | $19 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
35 | $8 | $19 |
| 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. |
35 | $93 | $378 |
| Subcutaneous or intramuscular chemotherapy injection This procedure involves administering anti-cancer hormonal medication through an injection into the tissue under the skin or into a muscle. |
30 | $26 | $141 |
| IV chemotherapy initiation with community continuation Initiation of an intravenous chemotherapy infusion in a clinic using clinic supplies, with continuation of the infusion in a community setting such as home or assisted living. |
30 | $208 | $986 |
| 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. |
26 | $0 | $3 |
| 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. |
23 | $18 | $111 |
| CT scan of chest with contrast A computed tomography scan of the chest using a contrast dye to enhance the visibility of internal structures. |
18 | $86 | $467 |
| 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. |
18 | $240 | $758 |
| CT scan of abdomen and pelvis, without contrast A computed tomography scan that creates detailed images of the abdominal and pelvic organs. The procedure is performed without the use of intravenous contrast dye. |
15 | $150 | $478 |
| 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. |
14 | $129 | $620 |
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.
14.9% high complexity
84.3% medium
0.9% routine
Industry Payment Transparency
Open Payments through 2024 ↗$45,630
Total received (2018-2024)
Avg $6,519/year across 7 years
Top 15% in IL for hematology & oncology
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
92
Companies
1,020
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.
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$21,004 (46.0%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$18,209 (39.9%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$6,417 (14.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$16,185
2023
$7,647
2022
$2,123
2021
$2,142
2020
$1,742
2019
$3,196
2018
$12,595
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
EMD Serono, Inc.
$11,001
Karyopharm Therapeutics Inc.
$1,100
PFIZER INC.
$301
Janssen Biotech, Inc.
$280
Alexion Pharmaceuticals, Inc.
$258
Novartis Pharmaceuticals Corporation
$241
AstraZeneca Pharmaceuticals LP
$236
Takeda Pharmaceuticals U.S.A., Inc.
$214
Regeneron Healthcare Solutions, Inc.
$206
Merck Sharp & Dohme LLC
$185
Astellas Pharma US Inc
$164
Eisai Inc.
$162
Lilly USA, LLC
$158
Genentech USA, Inc.
$134
ABBVIE INC.
$126
Daiichi Sankyo Inc.
$110
Tempus AI, Inc
$105
GlaxoSmithKline, LLC.
$104
E.R. Squibb & Sons, L.L.C.
$103
Pharmacosmos Therapeutics Inc.
$94
Celgene Corporation
$65
Gilead Sciences, Inc.
$65
ARRAY BIOPHARMA INC
$60
GENZYME CORPORATION
$59
JAZZ PHARMACEUTICALS INC.
$58
SOBI, INC
$44
Blue Earth Diagnostics Limited
$43
Exelixis Inc.
$35
TAIHO ONCOLOGY, INC.
$35
Agios Pharmaceuticals, Inc.
$33
Adaptive Biotechnologies Corporation
$30
Boehringer Ingelheim Pharmaceuticals, Inc.
$30
Blueprint Medicines Corporation
$29
BeiGene USA, Inc.
$25
Immunocore Limited
$25
Ipsen Biopharmaceuticals, Inc
$25
Aveo Pharmaceuticals, Inc.
$24
RECORDATI_RARE_DISEASES_INC.
$22
ImmunoGen, Inc.
$22
Mirati Therapeutics, Inc.
$22
GE HEALTHCARE
$21
ADC Therapeutics America, Inc.
$20
Kite Pharma, Inc.
$18
Bayer Healthcare Pharmaceuticals Inc.
$18
Secura Bio, Inc.
$16
Myriad Genetic Laboratories, Inc.
$16
Incyte Corporation
$16
Fennec Pharmaceuticals, Inc.
$15
Spectrum Pharmaceuticals Inc.
$13
Top 3 companies account for 76.6% of 2024 payments
All-time payments by company (2018-2024) ›
EMD Serono, Inc.
$11,259
Exelixis Inc.
$5,767
Bayer Healthcare Pharmaceuticals Inc.
$4,471
Eisai Inc.
$2,283
Heron Therapeutics, Inc.
$2,147
Karyopharm Therapeutics Inc.
$1,281
Genentech USA, Inc.
$1,168
Merck Sharp & Dohme Corporation
$1,151
Novartis Pharmaceuticals Corporation
$1,147
Janssen Biotech, Inc.
$1,000
AstraZeneca Pharmaceuticals LP
$999
E.R. Squibb & Sons, L.L.C.
$928
PFIZER INC.
$848
Incyte Corporation
$728
Lilly USA, LLC
$726
Amgen Inc.
$726
Takeda Pharmaceuticals U.S.A., Inc.
$716
Astellas Pharma US Inc
$609
Merck Sharp & Dohme LLC
$538
Pharmacyclics LLC, An AbbVie Company
$453
Daiichi Sankyo Inc.
$445
Alexion Pharmaceuticals, Inc.
$396
Celgene Corporation
$370
GENZYME CORPORATION
$346
Seagen Inc.
$276
Regeneron Healthcare Solutions, Inc.
$266
GlaxoSmithKline, LLC.
$256
Bayer HealthCare Pharmaceuticals Inc.
$237
Gilead Sciences, Inc.
$208
Rigel Pharmaceuticals, Inc.
$193
BeiGene USA, Inc.
$154
SANOFI-AVENTIS U.S. LLC
$150
Dova Pharmaceuticals
$149
TerSera Therapeutics LLC
$148
Janssen Pharmaceuticals, Inc
$137
Pharmacosmos Therapeutics Inc.
$128
ABBVIE INC.
$126
Pharmacyclics LLC, an AbbVie Company
$115
Global Blood Therapeutics, Inc.
$111
Blueprint Medicines Corporation
$107
Tempus AI, Inc
$105
Mirati Therapeutics, Inc.
$100
ARRAY BIOPHARMA INC
$99
JAZZ PHARMACEUTICALS INC.
$98
TESARO, Inc.
$95
Jazz Pharmaceuticals Inc.
$92
Boehringer Ingelheim Pharmaceuticals, Inc.
$82
AMAG Pharmaceuticals, Inc.
$82
AbbVie, Inc.
$81
Ipsen Biopharmaceuticals, Inc
$78
Kyowa Kirin, Inc.
$75
EISAI INC.
$75
Genmab U.S., Inc.
$63
Sun Pharmaceutical Industries Inc.
$59
Agios Pharmaceuticals, Inc.
$58
Clovis Oncology, Inc.
$57
Novo Nordisk Inc
$57
ADC Therapeutics America, Inc.
$56
Kite Pharma, Inc.
$47
RECORDATI_RARE_DISEASES_INC.
$47
SOBI, INC
$44
Blue Earth Diagnostics Limited
$43
Secura Bio, Inc.
$41
Aveo Pharmaceuticals, Inc.
$40
G1 Therapeutics, Inc.
$39
Puma Biotechnology, Inc.
$39
Myovant Sciences Inc.
$37
Myriad Genetic Laboratories, Inc.
$36
TAIHO ONCOLOGY, INC.
$35
Epizyme, Inc.,
$33
TOLMAR Pharmaceuticals, Inc.
$32
AbbVie Inc.
$30
Adaptive Biotechnologies Corporation
$30
Advanced Accelerator Applications
$28
R-Pharm US LLC
$28
Immunocore Limited
$25
CTI BioPharma Corp.
$25
Deciphera Pharmaceuticals Inc.
$24
AVEO Pharmaceuticals, Inc.
$23
Stemline Therapeutics Inc.
$23
ImmunoGen, Inc.
$22
Teva Pharmaceuticals USA, Inc.
$21
GE HEALTHCARE
$21
Verastem, Inc.
$20
Immunomedics, Inc.
$18
Progenics Pharmaceuticals, Inc.
$17
Coherus Biosciences Inc.
$17
Dendreon Pharmaceuticals LLC
$16
Fennec Pharmaceuticals, Inc.
$15
Array BioPharma Inc.
$15
Medtronic USA, Inc.
$13
Spectrum Pharmaceuticals Inc.
$13
Top 3 companies account for 47.1% of all-time payments
Associated products mentioned in payments ›
ADAKVEO · ALUNBRIG · AYVAKIT · Alecensa · Avastin · BAVENCIO · BENDEKA · BLENREP · BOSULIF · BRAFTOVI · BRUKINSA · Balversa · Bavencio · Blincyto · Braftovi · CABLIVI · CABOMETYX · CALQUENCE · CARVYKTI · CHANTIX · COPIKTRA · COSELA · CYRAMZA · Cabometyx · Columvi · Copiktra · Cresemba · DARZALEX · Doptelet · ELAHERE · ELIGARD · ELIQUIS · ELITEK · ELZONRIS · EMPLICITI · ENHERTU · ENJAYMO · EPKINLY · ERBITUX · ERLEADA · Enhertu · Epkinly · Erivedge · Erleada · FARESTON · FARYDAK · FERAHEME · FOTIVDA · FRUZAQLA · Fabhalta · Farydak · GAZYVA · GILOTRIF · IBRANCE · ICLUSIG · IMBRUVICA · IMFINZI · INJECTAFER · INLYTA · Imbruvica · Itovebi · Ixempra · JADENU · JAKAFI · JEMPERLI · JEVTANA · KANJINTI · KEYTRUDA · KIMMTRAK · KISQALI · KRAZATI · Kadcyla · Kyprolis · LENVIMA · LIBTAYO · LIBTAYO CEMIPLIMAB-RWLC INJECTION · LONSURF · LUMAKRAS · LUTATHERA · LYNPARZA · Lenvima · Lunsumio · Lutathera · MEKINIST · MONJUVI · MONOFERRIC · MYRISK · Monoferric · NERLYNX · NINLARO · Neulasta · Novoeight · Nplate · Nubeqa · OJJAARA · ONUREG · OPDIVO · ORGOVYX · OSTEOCOOL RF ABLATION · OXBRYTA · Onivyde · PADCEV · PEMAZYRE · PIQRAY · PLUVICTO · POSLUMA · POTELIGEO · PROMACTA · PROVENGE · PYLARIFY · PYRUKYND · Padcev · Pedmark · Perjeta · Phesgo · Pomalyst · QINLOCK · REBLOZYL · ROLVEDON · RYBREVANT · Revlimid · Rezlidhia · Rubraca · SANCUSO · SARCLISA · SCEMBLIX · SHINGRIX · SOLIRIS · SOMATULINE DEPOT · SPRYCEL · SUSTOL · SUTENT · SYLVANT · Somatuline Depot · Stivarga · TABRECTA · TAGRISSO · TALZENNA · TASIGNA · TAZVERIK · TECENTRIQ · TECVAYLI · TEPMETKO · TUKYSA · Tavalisse · Trodelvy · ULTOMIRIS · Udenyca · Ultomiris · VENCLEXTA · VERZENIO · VONJO · VPRIV · VYXEOS · Vanflyta · Venclexta · Vitrakvi · Vonjo · Vyloy · XALKORI · XARELTO · XOSPATA · XPOVIO · XTANDI · Xermelo · Xofigo · Xospata · YONSA · Yescarta · ZEJULA · ZEPZELCA · ZOLADEX · Zoladex · clonoSEQ · 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 →
The majority of payments (46%) are consulting fees, which typically reflect recognized clinical expertise sought by manufacturers.
Geographic Context
Hematology & oncology specialists within 10 mi
345
Per 100K population
6.7
County median income
$81,797
Nearest hospital
ADVOCATE CHRIST HOSPITAL & MEDICAL CENTER
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 reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Zalzaleh is a mixed practice specialist, with above-average Medicare volume (top 4% in IL), with consulting-driven industry engagement in the top 15% of IL peers, with 20 years of NPI registration.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Zalzaleh experienced with pembrolizumab injection (keytruda)?
Based on Medicare claims data, Dr. Zalzaleh performed 39,200 pembrolizumab injection (keytruda) 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. Zalzaleh receive payments from pharmaceutical companies?
Yes. Dr. Zalzaleh received a total of $45,630 from 92 companies across 1,020 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. Zalzaleh's costs compare to other hematology & oncology specialists in Oak Lawn?
Dr. Zalzaleh's average Medicare payment per service is $15. 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. Zalzaleh) 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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