Medicare Enrolled
Dr. John Isaac, M.D.
Interventional Cardiology · Houston, TX
Practice pattern: Cardiac & Remote
— Practice combining cardiac and remote services
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 →
Are you Dr. Isaac?
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What this data tells you about Dr. Isaac
Dr. John Isaac is an interventional cardiology specialist in Houston, TX, with 20 years of NPI registration. Based on federal Medicare data, Dr. Isaac performed 10,572 Medicare services in 2023. These records do not provide a deduplicated patient total.
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 payment records. A record can group multiple payments. These transfers are publicly reported through CMS Open Payments. Disclosure alone does not establish their effect on care. A reliable breakdown by payment category is not available in this snapshot. 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. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 20 years of NPI registration
▲ Top 3% volume in TX
$1,956,906 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗10,572
Medicare services
Top 3% in TX for interventional cardiology
Not available
Unique patients (not deduplicated)
$186
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
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. |
753 | $148 | $1,274 |
| 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. These counts do not measure clinical quality or years of experience.
11.5% high complexity
36.4% medium
52.1% 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
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
65
Companies
3,572
Payment records
Payments are publicly reported; disclosure does not establish legality · Not evidence of wrongdoing · How to interpret →
Payment categories are unavailable while the source breakdown is being rebuilt. Company and year totals do not identify how much belongs to each category.
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)
Esperion Therapeutics, Inc.
$50,449
Kiniksa Pharmaceuticals International, plc
$48,405
Amgen Inc.
$37,192
Regeneron Healthcare Solutions, Inc.
$14,744
Lilly USA, LLC
$14,188
Boehringer Ingelheim Pharmaceuticals, Inc.
$12,647
Boston Scientific Corporation
$9,974
E.R. Squibb & Sons, L.L.C.
$7,272
Abbott Laboratories
$1,870
Novartis Pharmaceuticals Corporation
$440
Novo Nordisk Inc
$384
PFIZER INC.
$354
AstraZeneca Pharmaceuticals LP
$351
Merck Sharp & Dohme LLC
$231
Actelion Pharmaceuticals US, Inc.
$208
BTG International, Inc.
$170
Impulse Dynamics (USA) Inc.
$119
Medtronic, Inc.
$99
iRhythm Technologies, Inc.
$78
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$58
Inspire Medical Systems, Inc.
$50
Janssen Pharmaceuticals, Inc
$46
HEARTFLOW, INC.
$36
SANOFI-AVENTIS U.S. LLC
$32
Alnylam Pharmaceuticals Inc.
$31
Lexicon Pharmaceuticals, Inc.
$22
CARDIVA MEDICAL, INC.
$22
AGEPHA Pharma FZ LLC
$21
SCPHARMACEUTICALS INC.
$20
AltaThera Pharmaceuticals LLC
$20
Top 3 companies account for 68.2% of 2024 payments
All-time payments by company (2018-2024) ›
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 all-time 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? Industry payments are disclosed through CMS Open Payments. Disclosure alone does not establish their purpose, legality, or effect on care. 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 →
Geographic Context
Interventional cardiologists in nearby ZIP areas
62
County median income
$73,104
Nearest hospital to ZIP centroid (approximate)
MEMORIAL HERMANN - TEXAS MEDICAL CENTER
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | NPPES snapshot; verify current record |
| Medicare Enrollment | ✓ PECOS | PECOS snapshot |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not included | 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. Isaac is a cardiac & remote specialist, with above-average Medicare volume (top 3% in TX), 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. 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. These records cover Medicare fee-for-service activity, including eligible younger beneficiaries; they do not measure total practice volume or clinical quality.
Does Dr. Isaac receive payments from pharmaceutical companies?
Yes. Dr. Isaac received a total of $1,956,906 from 65 companies across 3,572 payment records. A record can group multiple payments. These transfers are publicly disclosed through CMS Open Payments. Disclosure alone does not establish their legality or effect on care. 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 the presence of registry, enrollment, activity or payment records, not verified experience or clinical quality. 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?
Source publication dates and the snapshots loaded on this site can differ. Rebuilding a page does not refresh its source records. Check the Medicare reporting year and the payment interval shown above; consult the linked official sources for newer releases and current registry details. See our data freshness policy →
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About this page
This page combines public CMS records with calculated summaries and explanatory procedure labels. These transformations are not verbatim federal records. Sources: 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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