Medicare Enrolled
Dr. John Hollowed, MD
Student in an Organized Health Care Education/Training Program · Simi Valley, CA
Practice pattern: Cardiac Imaging
— Practice with significant diagnostic imaging and stress testing
Research-focused
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. Hollowed 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. Hollowed
Dr. John Hollowed is a student in an organized health care education/training program specialist in Simi Valley, CA, with 11 years of NPI registration. Based on federal Medicare data, Dr. Hollowed performed 1,979 Medicare services across 1,570 unique beneficiaries.
Between the years covered by Open Payments, Dr. Hollowed received a total of $7,418 from 14 pharmaceutical and/or device companies across 39 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in student in an organized health care education/training program. The majority of payments are classified as research and scientific activities (grants and research funding). Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Hollowed 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.
✓ 11 years in practice
▲ Top 10% volume in CA
$7,418 industry payments
Medicare Practice Summary
Medicare Utilization ↗1,979
Medicare services
Top 10% in CA for student in an organized health care education/training program
1,570
Unique beneficiaries
$84
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~180 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 |
|---|---|---|---|
| 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. |
279 | $98 | $680 |
| 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. |
217 | $104 | $858 |
| 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. |
173 | $12 | $111 |
| 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. |
116 | $6 | $43 |
| 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. |
112 | $136 | $1,085 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
109 | $171 | $1,374 |
| 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. |
94 | $141 | $1,320 |
| Regadenoson injection (Lexiscan) for heart stress test An injection of regadenoson, a medication used to stress the heart during diagnostic testing. |
84 | $42 | $458 |
| 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. |
83 | $10 | $259 |
| Ultrasound guidance for blood vessel access Use of ultrasound imaging to help locate and access a blood vessel. This guidance assists healthcare providers in performing procedures such as inserting IV lines or drawing blood. |
76 | $12 | $68 |
| Coronary angiography A procedure to insert a tube into a coronary artery to capture diagnostic images of the heart's blood vessels. |
56 | $171 | $1,320 |
| Critical care, first 30-74 min Emergency medical care for a critically ill or injured patient lasting between 30 and 74 minutes. This service involves direct patient care and medical decision making to stabilize the patient. |
52 | $177 | $1,800 |
| Technetium Tc-99m tetrofosmin diagnostic injection A diagnostic injection of Technetium Tc-99m tetrofosmin used for imaging studies. |
52 | $76 | $2,030 |
| Echocardiogram with color Doppler An ultrasound of the heart that uses color imaging to visualize blood flow, measure flow rate, and assess valve function. |
47 | $3 | $77 |
| Telephone or electronic assessment, 5-10 minutes A remote assessment and management service conducted via telephone, internet, or electronic health record. The consulting physician spends 5 to 10 minutes providing verbal and written reports. |
40 | $14 | $83 |
| Exercise or drug-induced heart stress test with ECG A heart stress test performed using exercise or medication while monitoring the electrocardiogram, with physician review of the results. |
35 | $11 | $76 |
| Follow-up heart ultrasound An ultrasound of the heart performed to monitor or reassess a previously identified condition or treatment progress. |
35 | $21 | $137 |
| Follow-up ultrasound of heart blood flow, valves and chambers An ultrasound exam that follows up on the heart's blood flow, valves, and chambers. It uses sound waves to create images of the heart's structure and function. |
35 | $6 | $37 |
| External EKG monitoring, 8-15 days Continuous external electrocardiogram recording and review over a period of 8 to 15 days to monitor heart rhythm. |
34 | $21 | $125 |
| 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. |
31 | $54 | $516 |
| 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. |
26 | $380 | $3,251 |
| 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. |
25 | $76 | $457 |
| 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. |
22 | $11 | $73 |
| 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 | $411 | $2,802 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
19 | $70 | $432 |
| 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. |
18 | $203 | $1,304 |
| Cardiac catheterization | 17 | $191 | $1,610 |
| Telephone medical discussion, 5-10 minutes A phone conversation with a physician lasting between 5 and 10 minutes to discuss medical matters. |
14 | $45 | $281 |
| New patient office visit, complex (60-74 min) | 13 | $188 | $1,360 |
| Transesophageal echocardiogram An ultrasound of the heart performed using a probe inserted into the esophagus to obtain detailed images of heart structures and function. |
12 | $89 | $588 |
| Echocardiogram, transthoracic An ultrasound test that uses sound waves to create images of the heart's blood flow, valves, and chambers. |
11 | $15 | $103 |
| Heart muscle strain imaging | 11 | $10 | $211 |
| Intravascular ultrasound of heart vessel, initial An ultrasound procedure used to evaluate a blood vessel within the heart during a diagnostic or treatment procedure. |
11 | $58 | $459 |
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.
9.7% high complexity
23.4% medium
66.9% routine
Industry Payment Transparency
Open Payments through 2024 ↗$7,418
Total received (2018-2024)
Avg $1,060/year across 7 years
Top 5% in CA for student in an organized health care education/training program
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
14
Companies
39
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.
Scientific / Research
Research funding and grants
$5,340 (72.0%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$1,846 (24.9%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$232 (3.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$370
2023
$244
2022
$339
2021
$1,002
2020
$5,251
2019
$113
2018
$100
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ShockWave Medical, Inc
$194
Janssen Pharmaceuticals, Inc
$123
Abbott Laboratories
$53
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
Medtronic Vascular, Inc.
$5,140
Abbott Laboratories
$1,153
Boston Scientific Corporation
$234
ShockWave Medical, Inc
$221
Shockwave Medical, Inc
$173
BOSTON SCIENTIFIC CORPORATION
$142
Janssen Pharmaceuticals, Inc
$123
AstraZeneca Pharmaceuticals LP
$102
ABIOMED
$45
Lantheus Medical Imaging, Inc.
$21
Regeneron Healthcare Solutions, Inc.
$19
HeartFlow, Inc.
$16
Amgen Inc.
$14
PFIZER INC.
$13
Top 3 companies account for 88.0% of all-time payments
Associated products mentioned in payments ›
ASSURITY · Assurity Pacemaker · BRILINTA · COROFLOW · DEFINITY · DRAGONFLY OPSTAR · Dragonfly OCT · EVKEEZA · FARXIGA · FFRct · GENERAL ATHERECTOMY · GENERAL STENTS · GENERAL - STENTS · GENERAL THERAPIES · Impella · PRESSUREWIRE · QUADRA ASSURA · Repatha · Resolute · Rotablator Rotational Atherectomy System Console Kit · SHOCKWAVE IVL SYSTEM WITH THE SHOCKWAVE C2 CORONARY IVL CATHETER · Shockwave IVL System with the Shockwave C2 Coronary IVL Catheter · VYNDAQEL · Vascular Lithotripsy · XARELTO · XIENCE SKYPOINT
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 (72%) are classified as scientific/research, suggesting involvement in clinical studies, grants, or innovation-related work. Total industry engagement is in the top 5% for student in an organized health care education/training program in CA.
Geographic Context
Student in an organized health care education/training programs within 10 mi
4,410
Per 100K population
526.1
County median income
$107,327
Nearest hospital
ADVENTIST HEALTH SIMI VALLEY
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. Hollowed is a cardiac imaging specialist, with above-average Medicare volume (top 10% in CA), with research-focused industry engagement in the top 5% of CA peers.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Hollowed experienced with hospital follow-up visit, high complexity?
Based on Medicare claims data, Dr. Hollowed performed 279 hospital follow-up visit, high complexity 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. Hollowed receive payments from pharmaceutical companies?
Yes. Dr. Hollowed received a total of $7,418 from 14 companies across 39 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. Hollowed's costs compare to other student in an organized health care education/training programs in Simi Valley?
Dr. Hollowed's average Medicare payment per service is $84. 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. Hollowed) 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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