Medicare Enrolled
Dr. Walt Marquardt, MD
Cardiovascular Disease · Sacramento, CA
Practice pattern: Electrophysiology & Cardiac
— Practice combining electrophysiology and cardiac services
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. Marquardt 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. Marquardt
Dr. Walt Marquardt is a cardiovascular disease specialist in Sacramento, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Marquardt performed 2,846 Medicare services across 2,513 unique beneficiaries.
Between the years covered by Open Payments, Dr. Marquardt received a total of $24,392 from 28 pharmaceutical and/or device companies across 716 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in cardiovascular disease. 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. Marquardt 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.
✓ 19 years in practice
▲ Top 38% volume in CA
$24,392 industry payments
Medicare Practice Summary
Medicare Utilization ↗2,846
Medicare services
Top 38% in CA for cardiovascular disease
2,513
Unique beneficiaries
$113
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~150 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. |
615 | $97 | $436 |
| 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. |
498 | $11 | $93 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
338 | $152 | $1,382 |
| 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. |
211 | $66 | $294 |
| Cardiac catheterization | 156 | $168 | $1,768 |
| 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. |
138 | $393 | $3,057 |
| Stress echocardiogram with ECG monitoring An ultrasound of the heart performed while monitoring heart rhythm during rest, exercise, or medication-induced stress, followed by a review and report of the findings. |
97 | $187 | $942 |
| 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. |
92 | $123 | $558 |
| External EKG monitoring, 8-15 days Continuous external electrocardiogram recording and review over a period of 8 to 15 days to monitor heart rhythm. |
86 | $21 | $112 |
| 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. |
85 | $144 | $806 |
| Continuous external EKG monitoring, 8-15 days This procedure involves recording heart rhythm continuously using an external EKG device over a period of 8 to 15 days. |
81 | $10 | $60 |
| 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. |
77 | $108 | $530 |
| Insertion of tube in right and left heart chambers and coronary artery for diagnosis with review by radiologist | 67 | $256 | $2,212 |
| Intravascular ultrasound of heart vessel, initial An ultrasound procedure used to evaluate a blood vessel within the heart during a diagnostic or treatment procedure. |
48 | $57 | $376 |
| 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. |
30 | $67 | $443 |
| Insertion of tube in left lower heart chamber, coronary artery and bypass graft for diagnosis with review by radiologist | 24 | $187 | $1,992 |
| Balloon dilation of single coronary artery or branch A procedure to widen a single coronary artery or its branch using a balloon catheter to restore blood flow. |
19 | $316 | $2,693 |
| Follow-up heart ultrasound An ultrasound of the heart performed to monitor or reassess a previously identified condition or treatment progress. |
19 | $21 | $118 |
| Aortography with contrast and radiologist review An imaging procedure using contrast dye to visualize the aorta above the heart valve, including professional review by a radiologist. |
19 | $30 | $846 |
| 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. |
17 | $99 | $439 |
| 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. |
17 | $94 | $148 |
| Stent placement and plaque removal in one vessel A procedure to clear plaque and blood clots from a single blood vessel, followed by the insertion of a stent and/or balloon dilation to keep the vessel open. |
14 | $518 | $3,421 |
| Insertion of tube in right and left heart chambers, coronary artery, and bypass graft for diagnosis with review by radiologist | 14 | $303 | $2,450 |
| Hospital discharge management, 30+ min This service covers the care provided by a physician or qualified healthcare professional on the day a patient is discharged from the hospital. It requires more than 30 minutes of total time spent on the day of discharge. |
14 | $96 | $417 |
| Coronary stent placement with plaque removal A procedure to clear plaque from a single coronary artery, followed by the insertion of a stent and/or balloon dilation to keep the vessel open. |
12 | $403 | $3,101 |
| Continuous external EKG monitoring, 48 hours to 7 days This procedure involves recording the heart's electrical activity continuously using an external device for a period exceeding 48 hours but not more than 7 days. |
12 | $10 | $356 |
| Continuous EKG monitoring review, 48-7 days Review and interpretation of continuous external EKG recordings lasting more than 48 hours up to 7 days. |
12 | $19 | $87 |
| 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. |
12 | $143 | $665 |
| Insertion of lower heart blood flow assist device A minimally invasive procedure to place a device that helps blood flow in the lower heart chamber. The device is inserted through the skin using artery access, and a radiologist reviews the placement. |
11 | $155 | $2,257 |
| 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. |
11 | $10 | $275 |
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.
24.5% high complexity
5.8% medium
69.8% routine
Industry Payment Transparency
Open Payments through 2024 ↗$24,392
Total received (2018-2024)
Avg $3,485/year across 7 years
Top 15% in CA for cardiovascular disease
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
28
Companies
716
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
$24,346 (99.8%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$46 (0.2%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$3,119
2023
$4,657
2022
$4,139
2021
$4,133
2020
$2,058
2019
$3,561
2018
$2,724
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Medtronic, Inc.
$1,176
ABIOMED
$907
Boston Scientific Corporation
$331
Inari Medical, Inc.
$252
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$236
CVRx, Inc.
$181
ShockWave Medical, Inc
$19
Janssen Pharmaceuticals, Inc
$17
Top 3 companies account for 77.4% of 2024 payments
All-time payments by company (2018-2024) ›
ABIOMED
$5,679
Boston Scientific Corporation
$4,555
Medtronic, Inc.
$4,079
Inari Medical, Inc.
$1,955
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$1,355
Medtronic Vascular, Inc.
$1,316
BOSTON SCIENTIFIC CORPORATION
$1,161
AstraZeneca Pharmaceuticals LP
$668
Chiesi USA, Inc.
$465
Abbott Laboratories
$416
ShockWave Medical, Inc
$398
Shockwave Medical, Inc
$341
Kestra Medical Technology Services, Inc.
$336
Edwards Lifesciences Corporation
$296
Cardiovascular Systems Inc.
$265
BIOTRONIK INC.
$245
CVRx, Inc.
$181
Novartis Pharmaceuticals Corporation
$125
PFIZER INC.
$117
HeartFlow, Inc.
$100
Bayer HealthCare Pharmaceuticals Inc.
$97
Janssen Pharmaceuticals, Inc
$63
Cardinal Health 200, LLC
$55
Osprey Medical Inc
$39
Teleflex LLC
$35
Philips Electronics North America Corporation
$25
ZOLL Circulation Inc
$14
Amgen Inc.
$11
Top 3 companies account for 58.7% of all-time payments
Associated products mentioned in payments ›
3F · ACIST RXI SYSTEM · AMPLATZER Occluders · AVVIGO · AVVIGO Guidance System · Absolute Pro vascular stent system · Assure WCD · BRILINTA · Barostim Neo System · CARDIOMEMS · CLEVIPREX · COMET · COREVALVE EVOLUT R · CT THROMBECTOMY SYSTEM KIT · Circulatory Support · Comet · Confirm Rx · CoreValve Evolut · DXTERITY · Diamondback Peripheral · DyeVert · ELIQUIS · ENTRESTO · Edwards SAPIEN 3 Transcatheter Heart Valve · Edwards SAPIEN 3 Ultra Transcatheter Heart Valve · EverFlex · FARXIGA · FFR LINK · FFR Link · FFRANGIO · FFRct · FLOWTRIEVER CATHETER · FilterWire EZ · FlowTriever · GENERAL STRUCTURAL HEART · GENERAL - STENTS · GENERAL TACHY · General - Stents · Guidezilla · HAWKONE · HawkOne · IGT_D Coronary · IN.PACT ADMIRAL · IN.PACT Admiral · Impella · Interventional Products · JUDO 3 · KENGREAL · Kerendia · LAUNCHER · LOKELMA · LOTUS EDGE · Legacy · LifeVest · MAMBA · MITRACLIP · MynxGrip Vascular Closure Device · ONYX FRONTIER · OPTICROSS · OptiCross · POLARIS · PROMUS · Peripheral Orbital Atherectomy System · RESOLUTE ONYX · ROTABLATOR · ROTAPRO · Repatha · Resolute · S · SHOCKWAVE IVL SYSTEM WITH THE SHOCKWAVE C2 CORONARY IVL CATHETER · SYMPLICITY G3 · SYNERGY · Shockwave IVL System with the Shockwave C2 Coronary IVL Catheter · Stingray · TELEMARK MICROCATHETER · TELESCOPE · Telescope · Temperature Management System · Tryton Side Branch Stent · Vascular Lithotripsy · WOLVERINE · WOLVERINE CORONARY CUTTING BALLOON · Wolverine Coronary Cutting Balloon · XARELTO
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 (100%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Cardiologists within 10 mi
153
Per 100K population
9.7
County median income
$88,724
Nearest hospital
MERCY GENERAL 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 reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Marquardt is an electrophysiology & cardiac specialist, with moderate Medicare volume, with low-engagement industry engagement in the top 15% of CA peers, with 19 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. Marquardt experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Marquardt performed 615 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. Marquardt receive payments from pharmaceutical companies?
Yes. Dr. Marquardt received a total of $24,392 from 28 companies across 716 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. Marquardt's costs compare to other cardiologists in Sacramento?
Dr. Marquardt's average Medicare payment per service is $113. 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. Marquardt) 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. 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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