Medicare Enrolled
Dr. Byung Ahn, MD
Cardiovascular Disease · Upland, CA
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. Ahn 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. Ahn
Dr. Byung Ahn is a cardiovascular disease specialist in Upland, CA, with 20 years of NPI registration. Based on federal Medicare data, Dr. Ahn performed 2,557 Medicare services across 1,763 unique beneficiaries.
Between the years covered by Open Payments, Dr. Ahn received a total of $8,461 from 38 pharmaceutical and/or device companies across 402 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. Ahn 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 in practice
▲ Top 41% volume in CA
$8,461 industry payments
Medicare Practice Summary
Medicare Utilization ↗2,557
Medicare services
Top 41% in CA for cardiovascular disease
1,763
Unique beneficiaries
$93
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~128 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. |
922 | $96 | $275 |
| 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. |
314 | $11 | $33 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
270 | $158 | $437 |
| 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. |
160 | $65 | $160 |
| 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. |
135 | $7 | $15 |
| 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. |
119 | $98 | $235 |
| 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. |
118 | $125 | $355 |
| 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. |
90 | $133 | $380 |
| Technetium Tc-99m sestamibi diagnostic injection A diagnostic injection of technetium Tc-99m sestamibi used for imaging studies. |
44 | $64 | $710 |
| Regadenoson injection (Lexiscan) for heart stress test An injection of regadenoson, a medication used to stress the heart during diagnostic testing. |
44 | $41 | $125 |
| Pacemaker system evaluation Assessment of a pacemaker device, including single, dual, multiple lead, or leadless systems. |
37 | $45 | $125 |
| Pacemaker programming, dual lead system Adjustment and configuration of a dual-lead pacemaker device to ensure proper operation and settings. |
36 | $65 | $175 |
| Cardiac catheterization | 28 | $194 | $615 |
| 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. |
28 | $64 | $190 |
| 2-day continuous ECG with review and report A two-day continuous electrocardiogram recording that includes a professional review and written report of the results. |
27 | $56 | $170 |
| Continuous ECG monitoring, up to 30 days Continuous heart rhythm monitoring for up to 30 days, including professional review and reporting of the results. |
26 | $20 | $55 |
| 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. |
26 | $734 | $1,940 |
| 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. |
23 | $295 | $870 |
| Exercise or drug-induced heart stress test with ECG A heart stress test performed using exercise or medication while an electrocardiogram is monitored under physician supervision. |
22 | $17 | $45 |
| Exercise or drug-induced heart stress test with ECG A test that monitors the heart's electrical activity while the patient exercises or receives medication to increase heart rate. |
22 | $23 | $78 |
| Routine 12-lead electrocardiogram (ECG) A test that records the electrical activity of the heart using at least 12 leads to produce a tracing. |
21 | $5 | $19 |
| 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. |
18 | $22 | $65 |
| 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. |
16 | $134 | $415 |
| 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. |
11 | $463 | $1,229 |
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.
15.6% high complexity
6.1% medium
78.3% routine
Industry Payment Transparency
Open Payments through 2024 ↗$8,461
Total received (2018-2024)
Avg $1,209/year across 7 years
Top 30% in CA for cardiovascular disease
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
38
Companies
402
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
$8,461 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$967
2023
$1,000
2022
$976
2021
$1,434
2020
$1,203
2019
$1,295
2018
$1,587
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$284
Novartis Pharmaceuticals Corporation
$207
Amgen Inc.
$168
Janssen Pharmaceuticals, Inc
$68
Merck Sharp & Dohme LLC
$53
Medtronic, Inc.
$45
PFIZER INC.
$41
Boehringer Ingelheim Pharmaceuticals, Inc.
$34
SANOFI-AVENTIS U.S. LLC
$24
SCPHARMACEUTICALS INC.
$23
Abbott Laboratories
$21
Top 3 companies account for 68.1% of 2024 payments
All-time payments by company (2018-2024) ›
Amgen Inc.
$1,270
Novartis Pharmaceuticals Corporation
$1,031
Janssen Pharmaceuticals, Inc
$851
ZOLL Services LLC (A/K/A ZOLL LifeCor Corp)
$806
Medtronic, Inc.
$526
SANOFI-AVENTIS U.S. LLC
$441
E.R. Squibb & Sons, L.L.C.
$347
Boehringer Ingelheim Pharmaceuticals, Inc.
$332
PFIZER INC.
$303
Amarin Pharma Inc.
$297
ZOLL Circulation Inc
$260
Medtronic Vascular, Inc.
$233
ABIOMED
$230
Merck Sharp & Dohme LLC
$170
Regeneron Healthcare Solutions, Inc.
$161
AstraZeneca Pharmaceuticals LP
$161
Abbott Laboratories
$157
Merck Sharp & Dohme Corporation
$141
Artivion, Inc.
$124
Siemens Medical Solutions USA, Inc.
$85
Boston Scientific Corporation
$80
Esperion Therapeutics, Inc.
$69
CathWorks, Inc.
$47
Cardinal Health 200, LLC
$42
BOSTON SCIENTIFIC CORPORATION
$41
Cardiovascular Systems Inc.
$32
Teleflex LLC
$31
Allergan Inc.
$25
SCPHARMACEUTICALS INC.
$23
Kiniksa Pharmaceuticals, Ltd.
$22
Astellas Pharma US Inc
$21
Philips Electronics North America Corporation
$18
Tactile Systems Technology Inc
$16
Daiichi Sankyo Inc.
$15
Opsens Inc.
$15
Lexicon Pharmaceuticals, Inc.
$15
W. L. Gore & Associates, Inc.
$11
ACIST MEDICAL SYSTEMS, INC.
$11
Top 3 companies account for 37.3% of all-time payments
Associated products mentioned in payments ›
ASSURITY · AZURE XT DR MRI SURESCAN · Arcalyst · Artis zee · Assurity Pacemaker · BRILINTA · BYSTOLIC · Bridge · CAMZYOS · CARDIOFORM Septal Occluder · CHANTIX · COROFLOW · Confirm Rx · CoreValve Evolut · Corlanor · Coronary Orbital Atherectomy System · ELIQUIS · ENTRESTO · FARXIGA · FFRangio System · FLEXITOUCH · FUROSCIX · GUIDELINER · INJECTAFER · Impella · Inpefa · JARDIANCE · LATITUDE · LATITUDE Communicator Power Supply · LEQVIO · LEXISCAN · LUX-Dx Insertable Cardiac Monitor · LifeVest · MICRA · MULTAQ · Merlin Connectivity and Remote · Micra · NEXLETOL · ON-X AORTIC HEART VALVE WITH CONFORM-X SEWING RING AND EXTENDED HOLDER · OptoWire · PRADAXA · PRALUENT · PRALUENT ALIROCUMAB INJECTION · RXI SYSTEMS · Repatha · Reveal LINQ · Temperature Management System · VERQUVO · VYNDAQEL · Vascepa · WATCHMAN · 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
177
Per 100K population
8.1
County median income
$82,184
Nearest hospital
SAN ANTONIO REGIONAL 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. Ahn is a clinical cardiology specialist, with moderate Medicare volume, with low-engagement industry engagement, 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. Ahn experienced with office visit, established patient (30-39 min)?
Based on Medicare claims data, Dr. Ahn performed 922 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. Ahn receive payments from pharmaceutical companies?
Yes. Dr. Ahn received a total of $8,461 from 38 companies across 402 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. Ahn's costs compare to other cardiologists in Upland?
Dr. Ahn's average Medicare payment per service is $93. 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. Ahn) 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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