Medicare Enrolled
Dr. John Hollowell, MD
Cardiovascular Disease · Plano, TX
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
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. Hollowell 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. Hollowell
Dr. John Hollowell is a cardiovascular disease specialist in Plano, TX, with 20 years of NPI registration. Based on federal Medicare data, Dr. Hollowell performed 4,661 Medicare services across 3,498 unique beneficiaries.
Between the years covered by Open Payments, Dr. Hollowell received a total of $6,663 from 33 pharmaceutical and/or device companies across 450 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. Hollowell 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.
✓ 20 years in practice
▲ Top 19% volume in TX
$6,663 industry payments
Medicare Practice Summary
Medicare Utilization ↗4,661
Medicare services
Top 19% in TX for cardiovascular disease
3,498
Unique beneficiaries
$42
Avg. Medicare payment
Medicare patients only (65+ / disabled) · Not a quality rating · How to read this →
~233 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 |
|---|---|---|---|
| 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. |
1,336 | $10 | $51 |
| 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. |
988 | $85 | $238 |
| 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. |
528 | $6 | $30 |
| Anticoagulant management for warfarin Management of anticoagulant therapy for a patient taking warfarin. This service involves monitoring and adjusting the medication regimen. |
447 | $7 | $41 |
| 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. |
376 | $61 | $168 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
283 | $135 | $729 |
| Prothrombin time test (blood clotting) A laboratory test that measures how long it takes for blood to clot. This procedure evaluates the body's coagulation process. |
117 | $4 | $26 |
| 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. |
101 | $109 | $310 |
| Blood draw (venipuncture) Insertion of a needle into a vein to collect a blood sample. |
88 | $8 | $17 |
| 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 | $61 | $186 |
| Perflutren lipid microspheres injection Injection of perflutren lipid microspheres, measured per milliliter. |
34 | $34 | $352 |
| 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. |
32 | $9 | $96 |
| External EKG monitoring, 8-15 days Continuous external electrocardiogram recording and review over a period of 8 to 15 days to monitor heart rhythm. |
32 | $20 | $98 |
| Telephone medical discussion, 5-10 minutes A phone conversation with a physician lasting between 5 and 10 minutes to discuss medical matters. |
32 | $36 | $131 |
| 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 | $70 | $207 |
| 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. |
30 | $127 | $335 |
| 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. |
26 | $97 | $352 |
| Heart muscle strain imaging | 25 | $27 | $139 |
| Routine 12-lead electrocardiogram (ECG) A test that records the electrical activity of the heart using at least 12 leads to produce a tracing. |
15 | $3 | $48 |
| Continuous ECG monitoring, up to 30 days Continuous heart rhythm monitoring for up to 30 days, including professional review and reporting of the results. |
15 | $18 | $130 |
| Follow-up heart ultrasound An ultrasound of the heart performed to monitor or reassess a previously identified condition or treatment progress. |
13 | $19 | $361 |
| Office visit, established patient (10-19 min) An office visit for an existing patient lasting 10 to 19 minutes. The visit involves medical evaluation and management of the patient's condition. |
13 | $36 | $105 |
| 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 | $9 | $96 |
| Continuous EKG monitoring review, 48-7 days Review and interpretation of continuous external EKG recordings lasting more than 48 hours up to 7 days. |
11 | $18 | $98 |
| Echocardiogram with color Doppler An ultrasound of the heart that uses color imaging to visualize blood flow, measure flow rate, and assess valve function. |
11 | $2 | $28 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
11 | $64 | $212 |
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.
6.1% high complexity
1.8% medium
92.1% routine
Industry Payment Transparency
Open Payments through 2024 ↗$6,663
Total received (2018-2024)
Avg $952/year across 7 years
Top 41% in TX for cardiovascular disease
33
Companies
450
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
$6,663 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$1,324
2023
$1,006
2022
$849
2021
$658
2020
$351
2019
$1,172
2018
$1,303
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Janssen Pharmaceuticals, Inc
$825
Amgen Inc.
$790
Kowa Pharmaceuticals America, Inc.
$596
Novartis Pharmaceuticals Corporation
$540
SANOFI-AVENTIS U.S. LLC
$431
Merck Sharp & Dohme LLC
$404
PFIZER INC.
$347
SCPHARMACEUTICALS INC.
$296
Astellas Pharma US Inc
$218
Boehringer Ingelheim Pharmaceuticals, Inc.
$215
ARBOR PHARMACEUTICALS, INC.
$191
AstraZeneca Pharmaceuticals LP
$187
HeartFlow, Inc.
$185
Esperion Therapeutics, Inc.
$167
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$165
Amarin Pharma Inc.
$149
E.R. Squibb & Sons, L.L.C.
$141
Gilead Sciences, Inc.
$127
Azurity Pharmaceuticals, Inc.
$98
Novo Nordisk Inc
$95
ARALEZ PHARMACEUTICALS US INC.
$85
Alnylam Pharmaceuticals Inc.
$65
Itamar Medical Inc
$61
Lexicon Pharmaceuticals, Inc.
$56
Bayer HealthCare Pharmaceuticals Inc.
$53
Boston Scientific Corporation
$40
Chiesi USA, Inc.
$31
Tactile Systems Technology Inc
$25
Arbor Pharmaceuticals, Inc.
$24
Cook Medical LLC
$19
Relypsa, Inc.
$18
GE Healthcare
$11
Althera Pharmaceuticals LLC
$8
Top 3 companies account for 33.2% of total payments
Associated products mentioned in payments ›
BRILINTA · Bidil · CAMZYOS · CHANTIX · Corlanor · EDARBYCLOR · ELIQUIS · ENTRESTO · Edarbi · Edarbyclor · FARXIGA · FFRct · FLEXITOUCH · FUROSCIX · Flexitouch Plus · JARDIANCE · KENGREAL · Kerendia · LEQVIO · LEXISCAN · LOKELMA · Lexiscan · LifeVest · Livalo · MULTAQ · NEXLETOL · ONPATTRO · Ozempic · PRADAXA · PRALUENT · Repatha · Roszet · Rybelsus · VERQUVO · VYNDAMAX · VYNDAQEL · Vascepa · Veltassa · Verquvo · WATCHMAN · WATCHMAN Access System · WatchPAT · WatchPATONE · XARELTO · ZILVER PTX · ZONTIVITY
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.
Equivalent to $143 per 100 Medicare services performed
Geographic Context
Cardiologists within 10 mi
284
Per 100K population
25.4
County median income
$117,588
Nearest hospital
CHILDRENS MEDICAL CENTER PLANO
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. Hollowell is a clinical cardiology specialist, with above-average Medicare volume (top 19% in TX), with low-engagement industry engagement, with 20 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. Hollowell experienced with electrocardiogram (ekg), 12-lead?
Based on Medicare claims data, Dr. Hollowell performed 1,336 electrocardiogram (ekg), 12-lead 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. Hollowell receive payments from pharmaceutical companies?
Yes. Dr. Hollowell received a total of $6,663 from 33 companies across 450 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. Hollowell's costs compare to other cardiologists in Plano?
Dr. Hollowell's average Medicare payment per service is $42. 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. Hollowell) 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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