Dr. Billie Marek, MD
What this data tells you about Dr. Marek
Dr. Billie Marek is a medical oncology specialist in Mcallen, TX, with 19 years of NPI registration. Based on federal Medicare data, Dr. Marek performed 134,172 Medicare services across 3,028 unique beneficiaries.
Between the years covered by Open Payments, Dr. Marek received a total of $649 from 14 pharmaceutical and/or device companies across 21 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in medical 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. Marek 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.
Medicare Practice Summary
Medicare Utilization ↗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) | 38,250 | $0 | $5 |
| Oxaliplatin chemotherapy injection | 28,200 | $0 | $33 |
| Pembrolizumab injection (Keytruda) | 23,200 | $43 | $136 |
| Contrast dye for imaging (iodine-based) | 6,830 | $0 | $3 |
| Epoetin alfa injection (Retacrit) for anemia | 5,740 | $6 | $28 |
| Darbepoetin injection (Aranesp) for anemia | 5,175 | $2 | $20 |
| Injection, atropine sulfate, 0.01 mg | 3,200 | $0 | $1 |
| Denosumab injection (Prolia/Xgeva) | 2,820 | $19 | $67 |
| Dexamethasone injection (steroid) | 2,311 | $0 | $1 |
| Immune globulin infusion (Octagam) | 2,258 | $33 | $235 |
| Injection, leucovorin calcium, per 50 mg | 2,190 | $3 | $25 |
| Injection, fluorouracil, 500 mg | 1,846 | $2 | $13 |
| Injection, irinotecan, 20 mg | 1,305 | $2 | $210 |
| Blood draw (venipuncture) | 908 | $8 | $20 |
| Complete blood count (CBC) with differential | 870 | $8 | $36 |
| Injection, granisetron hydrochloride, 100 mcg | 790 | $0 | $24 |
| Injection of additional new drug or substance into vein | 684 | $11 | $108 |
| Comprehensive metabolic blood panel | 653 | $10 | $64 |
| Office visit, established patient (30-39 min) | 541 | $90 | $368 |
| Anti-nausea injection (Aloxi/palonosetron) | 530 | $1 | $114 |
| Administration of chemotherapy into vein, 1 hour or less | 522 | $96 | $707 |
| Drug injection, under skin or into muscle | 415 | $10 | $96 |
| Injection, zoledronic acid, 1 mg | 343 | $6 | $431 |
| Infusion into a vein for therapy, prevention, or diagnosis, additional sequential infusion, 1 hour or less | 321 | $22 | $157 |
| Injection, gemcitabine hydrochloride, not otherwise specified, 200 mg | 316 | $3 | $373 |
| Administration of chemotherapy into vein, each additional hour | 286 | $21 | $161 |
| Injection, iron dextran, 50 mg | 266 | $13 | $43 |
| Infusion into a vein for therapy, prevention, or diagnosis, 1 hour or less | 234 | $46 | $313 |
| Administration of non-hormonal anti-neoplastic chemotherapy under skin or into muscle | 233 | $53 | $211 |
| Office visit, established patient (20-29 min) | 222 | $57 | $250 |
| Injection, magnesium sulfate, per 500 mg | 220 | $1 | $6 |
| Administration of additional new drug or substance into vein, 1 hour or less | 192 | $47 | $344 |
| Injection, fosnetupitant 235 mg and palonosetron 0.25 mg | 185 | $345 | $1,722 |
| Chemotherapy administration, intravenous infusion technique; initiation of infusion in the office/clinic setting using office/clinic pump/supplies, with continuation of the infusion in the community setting (e.g., home, domiciliary, rest home or assisted l | 184 | $124 | $500 |
| Leuprolide acetate (for depot suspension), 7.5 mg | 142 | $136 | $3,675 |
| Infusion into a vein for therapy, prevention, or diagnosis, each additional hour | 130 | $15 | $100 |
| Injection, diphenhydramine hcl, up to 50 mg | 124 | $1 | $7 |
| Irrigation of implanted venous access drug delivery device | 119 | $17 | $114 |
| Administration of additional new drug or substance into vein using push technique | 116 | $41 | $289 |
| Infusion into a vein for therapy, prevention, or diagnosis concurrent with another infusion | 106 | $15 | $94 |
| Administration of hormonal anti-neoplastic chemotherapy under skin or into muscle | 99 | $25 | $145 |
| Basic metabolic blood panel | 93 | $8 | $49 |
| Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg | 93 | $1 | $17 |
| CT scan of chest, without contrast | 76 | $41 | $686 |
| Ferritin level test (iron stores) | 76 | $13 | $60 |
| Iron level test | 76 | $6 | $27 |
| Iron binding capacity test | 76 | $8 | $35 |
| Ct scan of chest with contrast | 73 | $50 | $821 |
| PSA test (prostate cancer screening) | 63 | $18 | $94 |
| CT scan of abdomen and pelvis with contrast | 57 | $167 | $1,067 |
| Ct scan of abdomen and pelvis without contrast | 56 | $78 | $560 |
| Lactate dehydrogenase (enzyme) level | 56 | $6 | $31 |
| Reticulated (young) platelet measurement | 45 | $35 | $143 |
| Infusion, normal saline solution , 1000 cc | 39 | $2 | $19 |
| Drawing of blood for a medical problem | 36 | $60 | $264 |
| Nuclear medicine study from skull base to mid-thigh with ct scan | 35 | $1,109 | $4,802 |
| Fluorodeoxyglucose f-18 fdg, diagnostic, per study dose, up to 45 millicuries | 35 | $91 | $657 |
| Office visit, established patient, complex (40-54 min) | 31 | $123 | $496 |
| Infusion into a vein for hydration, each additional hour | 24 | $10 | $75 |
| Ct scan of soft tissue of neck with contrast | 20 | $68 | $658 |
| New patient office visit (45-59 min) | 13 | $111 | $565 |
| Injection of drug or substance into vein | 12 | $26 | $247 |
| Ct scan of abdomen without contrast | 11 | $41 | $658 |
Industry Payment Transparency
Open Payments through 2024 ↗Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
Payments by company (2024)
Associated products mentioned in payments ›
Most payments (94%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
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. Marek is a mixed practice specialist, with above-average Medicare volume (top 5% in TX), with low-engagement industry engagement, with 19 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. Marek experienced with iron infusion (feraheme)?
Does Dr. Marek receive payments from pharmaceutical companies?
How do Dr. Marek's costs compare to other medical oncologists in Mcallen?
What does Data Coverage mean?
Is this data up to date?
Explore related providers
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.
Provider corrections: Provider portal · Privacy questions: Privacy Policy · Terms: Terms of Use · Methodology: Methodology