Medicare Enrolled

Dr. David Chang, MD

Vascular Surgery Physician · San Jose, CA
Practice pattern: Clinical Cardiology — Primarily office-based clinical cardiology
Low-engagement
2512 SAMARITAN CT, San Jose, CA 95124
4083588272
In practice since 2006 (19 years)
NPI: 1265453724 verify on NPPES ↗
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. Chang 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. Chang

Dr. David Chang is a vascular surgery physician in San Jose, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 484 Medicare services across 318 unique beneficiaries.

Between the years covered by Open Payments, Dr. Chang received a total of $1,519 from 19 pharmaceutical and/or device companies across 25 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in vascular surgery physician. 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. Chang 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 ▲ 484 Medicare services $1,519 industry payments

Medicare Practice Summary

Medicare Utilization ↗
484
Medicare services
Bottom 42% in CA for vascular surgery physician
318
Unique beneficiaries
$331
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~25 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 (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.
 181 $87 $135
Ultrasound of hemodialysis access
An ultrasound imaging test used to evaluate the blood flow and structure of a hemodialysis access site.
 64 $135 $322
Ultrasound of leg arteries or grafts
An imaging test that uses sound waves to create pictures of the blood vessels in the legs or any surgical grafts present.
 42 $258 $555
Complete ultrasound of aorta, vena cava, groin vessels or bypass grafts
A complete ultrasound exam of the aorta, vena cava, groin vessels, or bypass grafts. This imaging test uses sound waves to visualize these blood vessels.
 40 $166 $390
Ultrasound of head and neck blood flow, bilateral
An ultrasound exam that uses sound waves to visualize and assess blood flow in the vessels of both the head and the neck.
 34 $198 $325
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.
 24 $107 $175
Ultrasound of arm or leg veins
An ultrasound exam of the veins in one arm or leg using compression and other maneuvers to assess blood flow and check for blockages.
 21 $120 $304
Ultrasound of leg arteries or grafts
An ultrasound exam that uses sound waves to create images of the arteries in one leg or any grafts present in that leg.
 20 $131 $335
Hemodialysis circuit intervention with stent placement
A radiologist inserts a needle or tube into the hemodialysis circuit and places a stent in the dialysis segment while reviewing the procedure.
 16 $4,750 $9,948
Ultrasound of arm or leg veins
An ultrasound exam of the veins in the arm or leg. The test uses sound waves to check blood flow and may include compression and other maneuvers.
 16 $184 $447
Hemodialysis circuit intervention with balloon dilation
A procedure to insert a needle or tube into a hemodialysis circuit and dilate the dialysis segment using a balloon, with radiological review.
 13 $1,302 $3,000
Balloon dilation of dialysis access with radiologist review
A minimally invasive procedure to widen a narrowed section of a dialysis access vessel using a balloon catheter. The procedure includes review by a radiologist to ensure proper placement and effectiveness.
 13 $628 $1,313
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.
11.6% high complexity
46.1% medium
42.4% routine

Industry Payment Transparency

Open Payments through 2024 ↗
$1,519
Total received (2018-2024)
Avg $253/year across 6 years
Bottom 41% in CA for vascular surgery physician
19
Companies
25
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
$1,519 (100.0%)

Payment trend by year

Annual totals from pharmaceutical and medical device companies.

2024
$24
2023
$77
2022
$140
2021
$21
2019
$448
2018
$810

Payments by company (2024)

Consulting
Speaking
Meals & Travel
Research
Abbott Laboratories
$24
Top 3 companies account for 100.0% of 2024 payments
All-time payments by company (2018-2024) ›
Medtronic Vascular, Inc.
$203
Teva Pharmaceuticals USA, Inc.
$140
Amgen Inc.
$125
Novo Nordisk Inc
$125
Endologix, Inc.
$123
Merck Sharp & Dohme Corporation
$121
AstraZeneca Pharmaceuticals LP
$119
Endologix LLC
$118
Relypsa, Inc.
$111
Abbott Laboratories
$93
Silk Road Medical, Inc.
$48
W. L. Gore & Associates, Inc.
$32
Allergan Inc.
$31
ConvaTec Inc.
$28
Medtronic, Inc.
$27
Boston Scientific Corporation
$21
Inari Medical, Inc.
$21
Smith+Nephew, Inc.
$18
Cardiovascular Systems Inc.
$17
Top 3 companies account for 30.8% of all-time payments
Associated products mentioned in payments ›
AJOVY · AQUACEL AG+ · Alto Abdominal Stent Graft System · Armada 35 percutaneous catheter · C3 Delivery System · CT THROMBECTOMY SYSTEM KIT · ENDURANT IIS · ENROUTE Transcarotid Neuroprotection System · ENROUTE Transcarotid Stent · Endurant · Grafix PL PRIME · Hi-Torque Command guide wire · IN.PACT Admiral · LOKELMA · MITRACLIP · Ovation · Ozempic · Peripheral Orbital Atherectomy System · Repatha · Supera peripheral stent system · Varithena Administration Pack · Veltassa · ZERBAXA
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.

Looking for a vascular surgery physician in San Jose?
Compare vascular surgery physicians in the San Jose area by procedure volume, costs, and industry payment transparency.
Browse vascular surgery physicians nearby

Geographic Context

Vascular surgery physicians within 10 mi
42
Per 100K population
2.2
County median income
$159,674
Nearest hospital
GOOD SAMARITAN HOSPITAL
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. Chang is a clinical cardiology specialist, with moderate Medicare volume, with low-engagement industry engagement, 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. Chang experienced with office visit, established patient (20-29 min)?
Based on Medicare claims data, Dr. Chang performed 181 office visit, established patient (20-29 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. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $1,519 from 19 companies across 25 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. Chang's costs compare to other vascular surgery physicians in San Jose?
Dr. Chang's average Medicare payment per service is $331. 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. Chang) 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.

Provider corrections: Provider portal · Privacy questions: Privacy Policy · Terms: Terms of Use · Methodology: Methodology

Data Disclaimer — Data sourced from the Centers for Medicare & Medicaid Services (CMS): National Plan and Provider Enumeration System (NPPES), Open Payments program, Medicare Provider Utilization and Payment Data, and Provider Enrollment & Certification data (PECOS). Published under the Freedom of Information Act (FOIA). This website is not affiliated with, endorsed by, or authorized by CMS, HHS, or the U.S. Government. Data may contain errors as reported to CMS by providers and reporting entities. Payments from industry are legal and do not indicate wrongdoing. Medicare data reflects only patients aged 65+ or those with qualifying disabilities. For corrections, contact CMS directly. This information does not constitute medical advice and should not be used as the sole basis for choosing a healthcare provider. Procedure descriptions use plain language and do not reference CPT® codes, which are copyrighted by the American Medical Association. Full methodology → · Report a data error → · Privacy policy →