Medicare Enrolled
Dr. Marshall Marcus, M.D.
Internal Medicine · St Petersburg, FL
Practice pattern: Electrophysiology & Remote
— Practice combining electrophysiology 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. Marcus 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. Marcus
Dr. Marshall Marcus is an internal medicine specialist in St Petersburg, FL, with 15 years of NPI registration. Based on federal Medicare data, Dr. Marcus performed 2,072 Medicare services in 2023. These records do not provide a deduplicated patient total.
Between the years covered by Open Payments, Dr. Marcus received a total of $84,641 from 50 pharmaceutical and/or device companies across 865 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. Marcus 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.
✓ 15 years of NPI registration
▲ Top 21% volume in FL
$84,641 industry payments
Medicare Practice Summary — 2023
Medicare Utilization ↗2,072
Medicare services
Top 21% in FL for internal medicine
Not available
Unique patients (not deduplicated)
$58
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 |
|---|---|---|---|
| Remote pacemaker/defibrillator monitoring, 90 days Remote evaluation of a pacemaker or implantable defibrillator system within 90 days of the last check. |
380 | $15 | $107 |
| 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. |
286 | $21 | $115 |
| 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. |
183 | $11 | $67 |
| 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. |
156 | $95 | $225 |
| Pacemaker programming, dual lead system Adjustment and configuration of a dual-lead pacemaker device to ensure proper operation and settings. |
108 | $59 | $203 |
| Remote evaluation of implantable defibrillator system Remote assessment of a single, dual, or multiple lead implantable defibrillator system within 90 days of the previous evaluation. |
103 | $25 | $226 |
| 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. |
99 | $96 | $220 |
| 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. |
98 | $18 | $86 |
| 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. |
88 | $19 | $92 |
| 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. |
86 | $26 | $169 |
| 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. |
63 | $126 | $435 |
| 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. |
55 | $62 | $153 |
| 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. |
48 | $93 | $300 |
| 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. |
47 | $70 | $153 |
| Evaluation of implantable heart and blood vessel monitoring system This procedure involves checking the function and data of an implanted device used to monitor heart and blood vessel activity. |
29 | $35 | $100 |
| 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. |
28 | $138 | $303 |
| Atrial fibrillation ablation with pulmonary vein isolation A procedure to treat atrial fibrillation by mapping the heart's electrical activity and destroying tissue causing irregular contractions. This is done by isolating the pulmonary veins using catheter-based destruction. |
26 | $796 | $4,135 |
| Pacemaker programming, single lead Adjustment and testing of a single-lead pacemaker to ensure it functions correctly. |
25 | $51 | $173 |
| Programming of dual lead implantable defibrillator system Adjustment and testing of the settings for an implanted heart device with two leads to ensure proper function. |
24 | $70 | $276 |
| 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. |
23 | $87 | $425 |
| 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. |
19 | $116 | $358 |
| Left heart catheterization with pacing and arrhythmia induction A procedure where catheters are inserted to record electrical activity and pace the left lower chamber of the heart. It also involves intentionally inducing an abnormal heart rhythm for diagnostic purposes. |
18 | $140 | $660 |
| Catheter ablation for abnormal heart rhythm A procedure where catheters are inserted to destroy tissue causing irregular heartbeats. |
15 | $257 | $1,549 |
| Hospital discharge day management, 30 minutes or less This service covers the final day of hospital care when the patient is being discharged. It includes coordination of care and instructions for the patient within a time frame of 30 minutes or less. |
14 | $63 | $151 |
| Pacemaker insertion with heart chamber electrodes A surgical procedure to implant a pacemaker device and place electrodes into the upper and lower chambers of the heart to regulate heart rhythm. |
13 | $374 | $2,097 |
| Programming of multiple lead implantable defibrillator system Adjustment and testing of the settings for an implanted heart device with multiple leads to ensure proper function. |
13 | $72 | $306 |
| Heart rhythm stimulator programming after drug infusion Adjustment of a heart rhythm stimulation device following a drug infusion. This procedure involves reprogramming the device settings to ensure proper function after the medication has been administered. |
13 | $67 | $666 |
| Ultrasound of heart blood vessels with radiologist review An ultrasound exam that evaluates blood vessels within the heart, including a review of the results by a radiologist. |
12 | $58 | $960 |
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.
49.4% high complexity
0.6% medium
50.0% routine
Industry Payment Transparency
Open Payments through 2024 ↗$84,641
Total received (2018-2024)
Avg $12,092/year across 7 years
Top 1% in FL for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
50
Companies
865
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
$3,633
2023
$10,360
2022
$14,640
2021
$4,516
2020
$4,709
2019
$16,953
2018
$29,829
Payments by company (2024)
Medtronic, Inc.
$741
Abbott Laboratories
$632
Boston Scientific Corporation
$348
BIOTRONIK INC.
$223
Boehringer Ingelheim Pharmaceuticals, Inc.
$207
Impulse Dynamics (USA) Inc.
$205
ATRICURE, INC.
$198
Biosense Webster, Inc.
$168
E.R. Squibb & Sons, L.L.C.
$168
PFIZER INC.
$144
Reflow Medical Inc
$136
Novartis Pharmaceuticals Corporation
$81
Amgen Inc.
$61
Esperion Therapeutics, Inc.
$57
AstraZeneca Pharmaceuticals LP
$38
Kestra Medical Technology Services, Inc.
$34
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$32
Alnylam Pharmaceuticals Inc.
$28
SANOFI-AVENTIS U.S. LLC
$27
Lexicon Pharmaceuticals, Inc.
$25
Philips North America LLC
$24
Chiesi USA, Inc.
$20
Janssen Pharmaceuticals, Inc
$19
Kiniksa Pharmaceuticals International, plc
$17
Top 3 companies account for 47.4% of 2024 payments
All-time payments by company (2018-2024) ›
BIOTRONIK INC.
$42,311
Medtronic Vascular, Inc.
$17,857
Boston Scientific Corporation
$6,591
Abbott Laboratories
$4,912
Medtronic, Inc.
$2,409
Medical Device Business Services, Inc.
$1,859
Biosense Webster, Inc.
$1,442
Acutus Medical, Inc.
$995
ATRICURE, INC.
$992
E.R. Squibb & Sons, L.L.C.
$944
Boehringer Ingelheim Pharmaceuticals, Inc.
$589
PFIZER INC.
$478
Amgen Inc.
$348
Impulse Dynamics (USA) Inc.
$286
Novartis Pharmaceuticals Corporation
$243
Janssen Pharmaceuticals, Inc
$242
Philips Electronics North America Corporation
$241
SANOFI-AVENTIS U.S. LLC
$213
ShockWave Medical, Inc
$168
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$165
Itamar Medical Inc
$154
Reflow Medical Inc
$136
CARDIVA MEDICAL, INC.
$118
AstraZeneca Pharmaceuticals LP
$104
Merck Sharp & Dohme LLC
$92
Esperion Therapeutics, Inc.
$87
Kestra Medical Technology Services, Inc.
$71
Merck Sharp & Dohme Corporation
$53
GENZYME CORPORATION
$47
BOSTON SCIENTIFIC CORPORATION
$45
Lexicon Pharmaceuticals, Inc.
$44
Novo Nordisk Inc
$40
Amarin Pharma Inc.
$38
CardioFocus, Inc.
$31
Alnylam Pharmaceuticals Inc.
$28
SCPHARMACEUTICALS INC.
$25
Philips North America LLC
$24
iRhythm Technologies, Inc.
$23
Daiichi Sankyo Inc.
$21
Chiesi USA, Inc.
$20
Endologix LLC
$18
Regeneron Healthcare Solutions, Inc.
$18
Inogen, Inc.
$18
Kiniksa Pharmaceuticals International, plc
$17
Braemar Manufacturing, LLC
$16
Bayer Healthcare Pharmaceuticals Inc.
$15
ARBOR PHARMACEUTICALS, INC.
$14
Kerecis Limited
$14
Kiniksa Pharmaceuticals, Ltd.
$13
Kowa Pharmaceuticals America, Inc.
$12
Top 3 companies account for 78.9% of all-time payments
Associated products mentioned in payments ›
(5044) MCOT · (5050) Ext Holter · (7999) SRC Undivided · (9124) LM Undivided · (9278) Bridge · (9556) IVC Filter Removal · (AM5) Lead management · AMPLATZER · AMPLATZER AMULET · ASSURITY · AVEIR · AZURE XT DR MRI SURESCAN · Acticor · Acticor 7 VR-T DX · Advisa · Advisor Catheter · Agilis NxT EP Introducer · Allure CRT Pacemaker · Allure Quadra RF CRT Pacemaker · Alto Abdominal Stent Graft System · Ampere RF Ablation Generator · Amplia MRI · Arcalyst · Arctic Front · Assure WCD · Assurity Pacemaker · Attain · Azure · BIOMONITOR · BRILINTA · BRK EP Transseptal Access · CAMZYOS · CARDIOBLATE CRYOFLEX · CARTO 3 · COBALT DR MRI SURESCAN · Cardiac Monitoring Suite · Cardiva VASCADE MVP VVCS 6-12F · CareLink · Carto 3 · Carto 3 System · CartoSound · Claria MRI · Cobalt · Confidense · Confirm Rx · Cool Point Irrigation Pump · Corlanor · ELIQUIS · ENSITE · ENSITE PRECISION · ENTRESTO · EPI-SENSE GUIDED COAGULATION SYS · EPI-SENSE GUIDED COAGULATION SYSTEM WITH VISITRAX · EVKEEZA · Edarbyclor · Edora · Edora 8 DR-T · Ellipse ICD · EnSite Precision Cardiac Mapping System · Ensite Cardiac Mapping System · FABRAZYME · FARXIGA · FUROSCIX · Fast-Cath EP Introducer · Fortify Assura · GENERAL BRADY · GENERAL TACHY · GENERAL THERAPIES · GENERAL EP · GENERAL THERAPIES · General - Structural Heart · HeartLight System · HeartMate 3 Left Ventricular Assist Device · INJECTAFER · InogenOne · Inpefa · JARDIANCE · KENGREAL · Kerecis Omega3 SurgiClose · Kerendia · LEQVIO · LINQ II · LUX-Dx Insertable Cardiac Monitor · LifeVest · Livalo · MERLIN@HOME · MICRA · MITRACLIP · MULTAQ · MYCARELINK · MYLUX · Merlin Connectivity and Remote · Micra · Mitra Clip system · MitraClip System · NA · NEXLETOL · OCTARAY MAPPING CATHETER · ONPATTRO · OPTIMIZER · Optimizer · Optimizer Smart System · Optisure Defibrillation ICD Lead · PRADAXA · PULSESELECT · PatientCare Link · QDOT MICRO Catheter · QUADRA ASSURA · Quadra Allure MP RF CRT Pacemkr · Quadra Assura CRT Defibrillator · Quartet CRT Lead · RESONATE · RESONATE EL ICD VR · RHYTHMIA · Repatha · Reveal LINQ · Rivacor · Rivacor 7 DR-T · Rybelsus · SELECTSECURE · SHOCKWAVE IVL SYSTEM WITH THE SHOCKWAVE C2 CORONARY IVL CATHETER · SelectSecure · Solia · Soundstar · TENDRIL · THORATEC HEARTMATE 3 LVAS IMPLANT KIT · TYRX · TactiCath Quartz CFA Catheter · VERQUVO · VYNDAMAX · VYNDAQEL · Vascepa · Visia AF · WATCHMAN · WATCHMAN Access System · WATCHMAN FLX · WatchPAT · XARELTO · ZIO XT Patch · ZOOM
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
Internal medicine physicians in nearby ZIP areas
1,361
County median income
$70,293
Nearest hospital to ZIP centroid (approximate)
HCA FLORIDA NORTHSIDE HOSPITAL
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. Marcus is an electrophysiology & remote specialist, with above-average Medicare volume (top 21% in FL), with 15 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. Marcus experienced with remote pacemaker/defibrillator monitoring, 90 days?
Based on Medicare claims data, Dr. Marcus performed 380 remote pacemaker/defibrillator monitoring, 90 days 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. Marcus receive payments from pharmaceutical companies?
Yes. Dr. Marcus received a total of $84,641 from 50 companies across 865 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. Marcus's costs compare to other internal medicine physicians in St Petersburg?
Dr. Marcus's average Medicare payment per service is $58. 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. Marcus) 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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