Dr. John Walker, M.D.
What this data tells you about Dr. Walker
Dr. John Walker is a radiation oncology specialist in San Antonio, TX, with 16 years of NPI registration. Based on federal Medicare data, Dr. Walker performed 354 Medicare services across 322 unique beneficiaries.
Between the years covered by Open Payments, Dr. Walker received a total of $20,323 from 23 pharmaceutical and/or device companies across 65 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in radiation 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. Walker 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 |
|---|---|---|---|
| Use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes | 124 | $10 | $36 |
| Ultrasonic guidance for blood vessel access | 44 | $11 | $41 |
| Ultrasonic guidance for needle placement | 41 | $23 | $91 |
| Needle biopsy of liver through skin | 21 | $60 | $256 |
| Needle biopsy of kidney | 18 | $95 | $368 |
| Fluoroscopic guidance for insertion or removal of central vein access device | 18 | $14 | $53 |
| Fine needle aspiration biopsy using ultrasound guidance, first growth | 14 | $55 | $214 |
| Office visit, established patient (20-29 min) | 14 | $52 | $161 |
| Ct guidance for tissue removal | 13 | $144 | $542 |
| Office visit, established patient (10-19 min) | 13 | $28 | $87 |
| Insertion of stomach tube using fluoroscopic guidance with contrast | 12 | $157 | $590 |
| Insertion of central venous tube with port (5 years or older) | 11 | $232 | $965 |
| Review by radiologist of ct guidance for needle placement | 11 | $55 | $211 |
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 ›
The majority of payments (65%) are consulting fees, which typically reflect recognized clinical expertise sought by manufacturers. Total industry engagement is in the top 4% for radiation oncology in TX.
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. Walker is a mixed practice specialist, with moderate Medicare volume, with consulting-driven industry engagement in the top 4% of TX peers, with 16 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. Walker experienced with use of a drug to induce depression of consciousness by physician performing a procedure (5 years or older), initial 15 minutes?
Does Dr. Walker receive payments from pharmaceutical companies?
How do Dr. Walker's costs compare to other radiation oncologists in San Antonio?
What does Data Coverage mean?
Is this data up to date?
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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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