Medicare Enrolled
Dr. John Isaac, M.D.
Interventional Cardiology · Houston, TX
Practice pattern: Cardiac & Remote
— Practice combining cardiac and remote services
Speaking/Promotional
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. Isaac 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. Isaac
Dr. John Isaac is an interventional cardiology specialist in Houston, TX, with 19 years of NPI registration. Based on federal Medicare data, Dr. Isaac performed 10,550 Medicare services across 6,121 unique beneficiaries.
Between the years covered by Open Payments, Dr. Isaac received a total of $1,956,906 from 65 pharmaceutical and/or device companies across 3572 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in interventional cardiology. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Isaac 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.
✓ 19 years in practice
▲ Top 2% volume in TX
$1,956,906 industry payments
Medicare Practice Summary
Medicare Utilization ↗10,550
Medicare services
Top 2% in TX for interventional cardiology
6,121
Unique beneficiaries
$186
Avg. Medicare payment
Medicare patients only (65+ / disabled) · Not a quality rating · How to read this →
~555 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. |
2,306 | $98 | $400 |
| Regadenoson injection (Lexiscan) for heart stress test An injection of regadenoson, a medication used to stress the heart during diagnostic testing. |
1,860 | $43 | $100 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
731 | $151 | $1,300 |
| Remote cardiac rhythm monitor evaluation, up to 30 days Review and analysis of data from a remote cardiac rhythm monitoring system over a period of up to 30 days. |
710 | $20 | $125 |
| Remote monitoring of implantable heart rhythm device Evaluation of data transmitted remotely from an implantable cardiovascular monitor, such as a loop recorder or subcutaneous cardiac rhythm monitor, over a period up to 30 days. |
709 | $28 | $145 |
| 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. |
608 | $154 | $650 |
| 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. |
551 | $56 | $345 |
| 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. |
429 | $11 | $90 |
| Rubidium rb-82, diagnostic, per study dose, up to 60 millicuries | 402 | $637 | $814 |
| Nuclear stress test with CT scan A nuclear medicine imaging test that evaluates blood flow in the heart muscle at rest and during stress, performed alongside a concurrent CT scan. |
398 | $1,976 | $8,000 |
| Remote pacemaker/defibrillator monitoring, 90 days Remote evaluation of a pacemaker or implantable defibrillator system within 90 days of the last check. |
213 | $17 | $125 |
| Remote pacemaker monitoring, 90 days Remote assessment of a pacemaker system, including single, dual, multiple lead, or leadless devices, performed up to 90 days apart. |
188 | $22 | $125 |
| 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. |
170 | $65 | $145 |
| 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. |
152 | $353 | $2,925 |
| Technetium Tc-99m sestamibi diagnostic injection A diagnostic injection of technetium Tc-99m sestamibi used for imaging studies. |
148 | $64 | $81 |
| 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. |
109 | $115 | $525 |
| 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. |
76 | $139 | $565 |
| Continuous external EKG monitoring, 48 hours to 7 days This procedure involves recording, analyzing, and interpreting a continuous external electrocardiogram (EKG) over a period of more than 48 hours up to 7 days. |
64 | $213 | $900 |
| 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. |
64 | $106 | $270 |
| Telephone medical discussion, 21-30 minutes A telephone conversation with a physician lasting between 21 and 30 minutes. This code covers the time spent discussing medical matters over the phone. |
55 | $104 | $500 |
| 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. |
54 | $98 | $190 |
| 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. |
52 | $198 | $707 |
| 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. |
51 | $10 | $50 |
| Remote patient monitoring management, 20 min/month Management based on results from remote vital sign monitoring for the first 20 minutes per calendar month. |
49 | $36 | $160 |
| Cardiac catheterization | 39 | $187 | $2,500 |
| 30-day continuous ECG with patient-triggered event transmission and review This procedure involves continuous electrocardiogram monitoring for up to 30 days, including the transmission of patient-triggered events. A healthcare professional reviews the data and provides a report. |
38 | $690 | $2,200 |
| 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. |
37 | $155 | $600 |
| Positive pressure ventilator therapy A therapy procedure that uses a positive pressure ventilator to assist with breathing. |
37 | $52 | $275 |
| Insertion of implantable heart rhythm monitor A small device is placed under the skin to continuously record the heart's electrical activity. This helps detect irregular heart rhythms that may not appear during a standard office visit. |
35 | $3,600 | $15,900 |
| Continuous ECG monitoring, up to 30 days Continuous heart rhythm monitoring for up to 30 days, including professional review and reporting of the results. |
35 | $20 | $85 |
| EEG monitoring, 61-84 hours with review This procedure involves continuous monitoring of brain wave activity for 61 to 84 hours. A healthcare professional reviews the data and provides a report. |
28 | $202 | $690 |
| 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. |
25 | $20 | $145 |
| 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. |
24 | $143 | $400 |
| Coronary stent placement A procedure to insert a stent into a coronary artery or its branch to keep it open, using balloon dilation during the process. |
20 | $464 | $3,300 |
| Continuous external EKG monitoring, 1 week Recording, analysis, and interpretation of a continuous external electrocardiogram performed over a period of more than one week. |
20 | $210 | $950 |
| Sleep study with heart rate and breathing monitoring A sleep study that monitors heart rate, breathing, airflow, and physical effort during sleep. |
19 | $42 | $400 |
| New patient office visit, complex (60-74 min) | 19 | $153 | $690 |
| External shock to heart to regulate heart beat A procedure that delivers an electric shock to the heart from outside the body to restore a normal heart rhythm. |
13 | $85 | $571 |
| Ultrasound of heart blood vessel or graft An ultrasound exam to evaluate blood flow in a heart blood vessel or graft, including a radiologist's review of the initial vessel. |
12 | $78 | $300 |
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.
11.3% high complexity
36.5% medium
52.3% routine
Industry Payment Transparency
Open Payments through 2024 ↗$1,956,906
Total received (2018-2024)
Avg $279,558/year across 7 years
Top 1% in TX for interventional cardiology
65
Companies
3,572
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.
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$1,909,832 (97.6%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$28,052 (1.4%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$19,022 (1.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$199,532
2023
$139,851
2022
$283,273
2021
$273,072
2020
$233,187
2019
$435,390
2018
$392,599
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Esperion Therapeutics, Inc.
$355,522
AstraZeneca Pharmaceuticals LP
$241,620
Amgen Inc.
$232,553
SANOFI-AVENTIS U.S. LLC
$184,670
Boehringer Ingelheim Pharmaceuticals, Inc.
$152,485
Janssen Pharmaceuticals, Inc
$130,445
E.R. Squibb & Sons, L.L.C.
$125,081
Regeneron Healthcare Solutions, Inc.
$104,200
Amarin Pharma Inc.
$87,339
Novartis Pharmaceuticals Corporation
$79,367
Lilly USA, LLC
$66,000
PFIZER INC.
$48,991
Kiniksa Pharmaceuticals International, plc
$48,405
Kiniksa Pharmaceuticals, Ltd.
$27,311
Impulse Dynamics (USA) Inc.
$16,033
Althera Pharmaceuticals LLC
$13,751
Boston Scientific Corporation
$13,340
Novo Nordisk Inc
$10,447
Abbott Laboratories
$8,336
BOSTON SCIENTIFIC CORPORATION
$1,651
Philips Electronics North America Corporation
$1,295
Medtronic Vascular, Inc.
$1,068
Medtronic, Inc.
$1,003
ABIOMED
$592
BIOTRONIK INC.
$505
Merck Sharp & Dohme LLC
$492
HeartFlow, Inc.
$434
ARALEZ PHARMACEUTICALS US INC.
$395
Kowa Pharmaceuticals America, Inc.
$377
Astellas Pharma US Inc
$291
Actelion Pharmaceuticals US, Inc.
$280
Watermark Medical, Inc.
$224
Regeneron Pharmaceuticals, Inc.
$196
BTG International, Inc.
$170
ARBOR PHARMACEUTICALS, INC.
$141
Lundbeck LLC
$137
Aziyo Biologics, Inc.
$124
Bayer Healthcare Pharmaceuticals Inc.
$123
Lexicon Pharmaceuticals, Inc.
$123
iRhythm Technologies, Inc.
$120
Acacia Pharma Inc
$117
Preventice Services, LLC
$116
Bard Peripheral Vascular, Inc.
$109
Gilead Sciences, Inc.
$105
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$82
Arbor Pharmaceuticals, Inc.
$78
Inspire Medical Systems, Inc.
$64
Tactile Systems Technology Inc
$62
Merck Sharp & Dohme Corporation
$57
CARDIVA MEDICAL, INC.
$52
G Medical Diagnostic Services, Inc.
$42
AltaThera Pharmaceuticals LLC
$41
Smith & Nephew, Inc.
$37
HEARTFLOW, INC.
$36
Medicure Pharma Inc.
$35
Smith+Nephew, Inc.
$32
Avinger Inc.
$32
Alnylam Pharmaceuticals Inc.
$31
Chiesi USA, Inc.
$25
CVRx, Inc.
$24
AGEPHA Pharma FZ LLC
$21
SCPHARMACEUTICALS INC.
$20
Edwards Lifesciences Corporation
$18
Ethicon US, LLC
$18
CHIESI USA, INC.
$16
Top 3 companies account for 42.4% of total payments
Associated products mentioned in payments ›
ACCENT · AIRSUPRA · ATTAIN COMMAND + SUREVALVE · AZURE XT DR MRI SURESCAN · Accent Pacemaker · Advisa · Allure Quadra RF CRT Pacemaker · Aranesp · Arcalyst · Assurity Pacemaker · Axium INS DRG IPG · Azure · BREZTRI · BRILINTA · BYFAVO · Barostim Neo System · BodyGuardian · CAMZYOS · CARDIOMEMS · CARDIVA VASCADE 6/7F VCS · CHANTIX · CLEVIPREX 50MG/100ML · COBALT DR MRI SURESCAN · CONFIRM RX · COROFLOW · CRESEMBA · Cardiac Monitoring Suite · Circulatory Support · Claria MRI · Cobalt · Confirm Rx · CoreValve Evolut · Corlanor · DERMABOND Portfolio · DIAMONDBACK PERIPHERAL · DISEASE STATE · DRAGONFLY OPSTAR · ECM Patch · EDWARDS SAPIEN 3 TRANSCATHETER HEART VALVE (THV) · ELIQUIS · EMBLEM S ICD ELECTRODE DELIVERY SYSTEM · ENTRESTO · EVKEEZA · Edarbi · Edarbyclor · Evera · FARXIGA · FFRct · FLEXITOUCH · FORTIFY ASSURA · FUROSCIX · Flexitouch Plus · General - Therapies · HeartMate 3 Left Ventricular Assist Device · HeartMate 3 Left Ventricular Dev · Horizant · INSPIRE · Image Guided Therapy Devices _ Coronary · Impella · Inpefa · JARDIANCE · KENGREAL · Kerendia · LEQVIO · LEXISCAN · LIFESTENT · LINQ II · LIVALO · LODOCO · LUTONIX · LUX DX · LUX-DX · LUX-Dx Insertable Cardiac Monitor · LifeVest · Livalo · MERLIN@HOME · MRI Ready Leads · MULTAQ · Merlin Connectivity and Remote · Micra · Mitra Clip system · NEXLETOL · NEXLIZET · NORTHERA · ONYX FRONTIER · OPSUMIT · OPSUMIT MACITENTAN · OPTIMIZER · OPTIS · OPTISURE · Optimizer · Optimizer Smart System · Ozempic · PANTHERIS · PERCEPTA QUAD CRT-P MRI SURESCAN · PICO · PICO Single Use Negative Pressure Wound Therapy · PRADAXA · PRALUENT · PRALUENT ALIROCUMAB INJECTION · PREVNAR - 13 · Percepta · Pouch · Quadra Assura CRT Defibrillator · RESONATE EL ICD VR · Repatha · Reveal LINQ · Roszet · Rybelsus · SEEQ · SELECTSECURE · SOLARA QUAD CRT-P MRI SURESCAN · SYNERGY · Sotalol Hydrochloride · THORATEC HEARTMATE 3 LVAS IMPLANT KIT · TactiCath Quartz CFA Catheter · UPTRAVI · VERQUVO · VIGILANT · VYNDAQEL · Vascepa · WATCHMAN · WATCHMAN Access System · WATCHMAN FLX · Wegovy · XARELTO · XIENCE SKYPOINT · XIENCE V · XIENCE XPEDITION · Xience Sierra Coronary Stent · Xience Sierra Coronary Stent System · ZIO Patch · ZIO XT Patch · ZONTIVITY · ZYPITAMAG · Zio monitor
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 (98%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in interventional cardiology and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 1% for interventional cardiology in TX.
Equivalent to $18,549 per 100 Medicare services performed
Geographic Context
Interventional cardiologists within 10 mi
62
Per 100K population
1.3
County median income
$73,104
Nearest hospital
MEMORIAL HERMANN - TEXAS 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 measures how much public data is available about a provider — not how good they are. How we calculate this →
Summary
Dr. Isaac is a cardiac & remote specialist, with above-average Medicare volume (top 2% in TX), with speaking/promotional industry engagement in the top 1% of TX peers, 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. Isaac experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Isaac performed 2,306 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. Isaac receive payments from pharmaceutical companies?
Yes. Dr. Isaac received a total of $1,956,906 from 65 companies across 3,572 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. Isaac's costs compare to other interventional cardiologists in Houston?
Dr. Isaac's average Medicare payment per service is $186. 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. Isaac) 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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