Medicare Enrolled
Dr. John Gresham, M.D.
Interventional Cardiology · San Antonio, TX
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
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. Gresham 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. Gresham
Dr. John Gresham is an interventional cardiology specialist in San Antonio, TX, with 18 years of NPI registration. Based on federal Medicare data, Dr. Gresham performed 5,256 Medicare services across 3,168 unique beneficiaries.
Between the years covered by Open Payments, Dr. Gresham received a total of $9,986 from 49 pharmaceutical and/or device companies across 456 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in interventional cardiology. 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. Gresham 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.
✓ 18 years in practice
▲ Top 11% volume in TX
$9,986 industry payments
Medicare Practice Summary
Medicare Utilization ↗5,256
Medicare services
Top 11% in TX for interventional cardiology
3,168
Unique beneficiaries
$80
Avg. Medicare payment
Medicare patients only (65+ / disabled) · Not a quality rating · How to read this →
~292 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 |
|---|---|---|---|
| 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. |
1,646 | $91 | $216 |
| Electrocardiogram (EKG), 12-lead A standard heart rhythm test using at least 12 leads to record electrical activity. A healthcare provider interprets the results and provides a written report. |
699 | $10 | $35 |
| 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. |
535 | $62 | $150 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
489 | $146 | $398 |
| Regadenoson injection (Lexiscan) for heart stress test An injection of regadenoson, a medication used to stress the heart during diagnostic testing. |
436 | $42 | $300 |
| EKG interpretation and report A standard electrocardiogram test that records the heart's electrical activity using at least 12 leads. The service includes a professional interpretation of the results and a written report. |
303 | $6 | $25 |
| Office visit for established patient An office visit for an existing patient that may not require the healthcare professional to be present. |
139 | $17 | $46 |
| Technetium Tc-99m tetrofosmin diagnostic injection A diagnostic injection of Technetium Tc-99m tetrofosmin used for imaging studies. |
114 | $56 | $542 |
| Nuclear stress test of heart muscle A nuclear medicine imaging test that evaluates blood flow to the heart muscle at rest and during stress using a special camera. |
95 | $329 | $911 |
| 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. |
95 | $115 | $357 |
| Exercise or drug-induced heart stress test with ECG A heart stress test performed using exercise or medication while monitoring the electrocardiogram under physician supervision and review. |
90 | $54 | $140 |
| 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. |
88 | $61 | $206 |
| 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. |
77 | $136 | $465 |
| Sedation by physician, initial 15 minutes Administration of a drug to induce depression of consciousness by the physician performing a procedure. This code covers the initial 15 minutes of sedation for patients aged 5 years or older. |
67 | $10 | $87 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in the arm or leg. The test uses sound waves to check blood flow and may include compression and other maneuvers. |
62 | $133 | $375 |
| Ultrasound of leg arteries or grafts An imaging test that uses sound waves to create pictures of the blood vessels in the legs or any surgical grafts present. |
55 | $183 | $493 |
| Ultrasound of arm or leg veins An ultrasound exam of the veins in one arm or leg using compression and other maneuvers to assess blood flow and check for blockages. |
55 | $88 | $235 |
| Cardiac catheterization | 42 | $220 | $960 |
| Radiofrequency vein destruction, first vein A procedure to treat the first incompetent vein in the arm or leg using radiofrequency energy and imaging guidance. |
28 | $834 | $2,758 |
| 2-day continuous ECG with review and report A two-day continuous electrocardiogram recording that includes a professional review and written report of the results. |
22 | $47 | $172 |
| Pacemaker system evaluation Assessment of a pacemaker device, including single, dual, multiple lead, or leadless systems. |
21 | $34 | $86 |
| Emergency department visit, moderate complexity An emergency department visit for an established or new patient involving a moderate level of medical decision making. |
20 | $95 | $234 |
| Remote monitoring of implantable heart device, up to 30 days Remote evaluation of an implanted heart or blood vessel monitoring system over a period of up to 30 days. |
19 | $18 | $56 |
| Pacemaker programming, dual lead system Adjustment and configuration of a dual-lead pacemaker device to ensure proper operation and settings. |
16 | $60 | $127 |
| Ultrasound of head and neck blood flow, bilateral An ultrasound exam that uses sound waves to visualize and assess blood flow in the vessels of both the head and the neck. |
16 | $139 | $388 |
| Initial hospital admission, moderate complexity Initial hospital inpatient or observation care for a new patient involving moderate-level medical decision making, with at least 55 minutes total time on the date of the encounter. |
16 | $102 | $330 |
| 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. |
11 | $62 | $249 |
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.
10.8% high complexity
17.6% medium
71.6% routine
Industry Payment Transparency
Open Payments through 2024 ↗$9,986
Total received (2018-2024)
Avg $1,427/year across 7 years
Top 44% in TX for interventional cardiology
49
Companies
456
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
$9,872 (98.9%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$114 (1.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,329
2023
$1,159
2022
$745
2021
$867
2020
$1,111
2019
$1,428
2018
$3,347
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Medtronic Vascular, Inc.
$1,586
Janssen Pharmaceuticals, Inc
$1,142
Amgen Inc.
$750
Actelion Pharmaceuticals US, Inc.
$713
Novartis Pharmaceuticals Corporation
$579
SANOFI-AVENTIS U.S. LLC
$499
AstraZeneca Pharmaceuticals LP
$377
ABIOMED
$346
PFIZER INC.
$325
Esperion Therapeutics, Inc.
$319
Gilead Sciences, Inc.
$311
Amarin Pharma Inc.
$295
E.R. Squibb & Sons, L.L.C.
$274
Boston Scientific Corporation
$265
United Therapeutics Corporation
$229
ATRICURE, INC.
$212
Merck Sharp & Dohme LLC
$183
Abbott Laboratories
$133
Biocompatibles, Inc.
$125
Allergan Inc.
$123
Bayer HealthCare Pharmaceuticals Inc.
$107
Arbor Pharmaceuticals, Inc.
$87
CVRx, Inc.
$68
Kiniksa Pharmaceuticals International, plc
$66
EKOS Corporation
$65
Penumbra, Inc.
$61
InfoBionic, Inc
$56
Bardy Diagnostics, Inc.
$49
Bayer Healthcare Pharmaceuticals Inc.
$48
Acist Medical Systems, Inc.
$48
ARBOR PHARMACEUTICALS, INC.
$46
BOSTON SCIENTIFIC CORPORATION
$41
Tactile Systems Technology Inc
$40
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$40
Azurity Pharmaceuticals, Inc.
$38
HeartFlow, Inc.
$38
Boehringer Ingelheim Pharmaceuticals, Inc.
$37
Regeneron Healthcare Solutions, Inc.
$36
Novo Nordisk Inc
$32
SCPHARMACEUTICALS INC.
$28
Kiniksa Pharmaceuticals, Ltd.
$25
Amicus Therapeutics, Inc.
$23
AngioDynamics, Inc.
$21
Surmodics, Inc.
$21
Medtronic, Inc.
$20
AGEPHA Pharma FZ LLC
$17
Kowa Pharmaceuticals America, Inc.
$16
MEDICOMP INC
$14
ARALEZ PHARMACEUTICALS US INC.
$10
Top 3 companies account for 34.8% of total payments
Associated products mentioned in payments ›
AVAPRO · Adempas · Arcalyst · Asclera · Assurity Pacemaker · BRILINTA · BYSTOLIC · Barostim Neo System · CAMZYOS · CHANTIX · CROSSBOSS · CVI Systems · Cardiac Monitor · Carnation Ambulatory Monitor · ClosureFast · ClosureRFG · ClosureRFS · Corlanor · DIAMONDBACK PERIPHERAL · EKOSONIC · ELIQUIS · ENTRESTO · EPI-SENSE GUIDED COAGULATION SYSTEM WITH VISITRAX · Edarbi · FARXIGA · FFRct · FUROSCIX · Flexitouch Plus · GALAFOLD · GENERAL - VASCULAR INTERVENTION · HAWKONE · Impella · Indigo · Indigo System · JARDIANCE · Kerendia · LEQVIO · LINZESS · LODOCO · LifeVest · Livalo · MRI Ready Leads · MULTAQ · MoMe Kardia · NAMZARIC · NEXLETOL · NONE · OPSUMIT · OPSUMIT MACITENTAN · ORENITRAM · Ozempic · PRADAXA · PRALUENT · PRALUENT ALIROCUMAB INJECTION · Pacemakers · Repatha · Reveal LINQ · Rybelsus · Sublime 014 Rx PTA Balloon Dilatation Catheter · UPTRAVI · VARITHENA · VERQUVO · VYNDAMAX · Vascepa · VenaSeal · Verquvo · WATCHMAN · WATCHMAN Access System · WATCHMAN FLX · XARELTO · XIENCE SKYPOINT · Xience Sierra Coronary Stent System · ZONTIVITY
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 (99%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Equivalent to $190 per 100 Medicare services performed
Geographic Context
Interventional cardiologists within 10 mi
34
Per 100K population
1.7
County median income
$70,571
Nearest hospital
SOUTH TEXAS SPINE AND SURGICAL HOSPITAL
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. Gresham is a clinical cardiology specialist, with above-average Medicare volume (top 11% in TX), with low-engagement industry engagement, with 18 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. Gresham experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Gresham performed 1,646 office visit, established patient (30-39 min) 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. Gresham receive payments from pharmaceutical companies?
Yes. Dr. Gresham received a total of $9,986 from 49 companies across 456 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. Gresham's costs compare to other interventional cardiologists in San Antonio?
Dr. Gresham's average Medicare payment per service is $80. 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. Gresham) 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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