Medicare Enrolled
Dr. Alvin Chang, M.D.
Geriatric Medicine (Internal Medicine) Physician · Tustin, 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. 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 →
Are you Dr. Chang?
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What this data tells you about Dr. Chang
Dr. Alvin Chang is a geriatric medicine physician in Tustin, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 2,137 Medicare services across 1,108 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $7,538 from 52 pharmaceutical and/or device companies across 348 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in geriatric medicine (internal medicine) 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
▲ Top 23% volume in CA
$7,538 industry payments
Medicare Practice Summary
Medicare Utilization ↗2,137
Medicare services
Top 23% in CA for geriatric medicine (internal medicine) physician
1,108
Unique beneficiaries
$73
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~112 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 |
|---|---|---|---|
| Home visit, established patient, low complexity A physician visits an existing patient at their residence to provide care involving a low level of medical decision making. The visit lasts at least 30 minutes. |
931 | $58 | $117 |
| 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. |
327 | $92 | $248 |
| Annual depression screening | 180 | $21 | $30 |
| Initial nursing facility care, high complexity An initial visit by a healthcare provider to a patient in a nursing facility involving a high level of medical decision making, lasting at least 45 minutes. |
109 | $141 | $240 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
95 | $140 | $202 |
| Home visit, established patient, moderate complexity A home visit for an established patient involving moderate medical decision making. The visit requires at least 40 minutes of time if time is used to determine the level of service. |
86 | $102 | $171 |
| 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. |
72 | $98 | $280 |
| Nursing facility visit, moderate complexity A follow-up visit by a healthcare provider at a nursing facility for an established patient. The visit involves moderate medical decision making and takes at least 30 minutes. |
52 | $82 | $121 |
| 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. |
46 | $66 | $97 |
| Drug injection, under skin or into muscle A procedure involving the administration of a medication or substance via injection into the subcutaneous tissue or muscle. |
34 | $5 | $38 |
| Home health plan of care certification Certification by a physician or allowed practitioner for Medicare-covered home health services under a home health plan of care. This includes contacting the home health agency and reviewing reports of patient status required by physicians. |
33 | $46 | $80 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
32 | $47 | $160 |
| Nursing facility visit, low complexity A daily follow-up visit for an existing patient in a nursing facility involving straightforward medical decision making. The visit requires at least 15 minutes of time if time is used to determine the level of care. |
29 | $48 | $92 |
| 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 | $48 | $220 |
| Transitional care management, high complexity Coordination of care for a patient transitioning from a short-term hospital stay or other facility to home or another care setting. This service addresses a high-complexity medical problem. |
25 | $238 | $361 |
| Home health agency supervision, complex multidisciplinary care Supervision by a physician or allowed practitioner for a patient receiving Medicare-covered services from a participating home health agency. This involves complex and multidisciplinary care modalities, with the patient not present during the supervision. |
23 | $89 | $200 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
18 | $1 | $10 |
| Annual wellness visit, initial visit A yearly appointment to review your health and create a personalized prevention plan. This initial visit focuses on preventive care and health assessment. |
17 | $178 | $250 |
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.
Industry Payment Transparency
Open Payments through 2024 ↗$7,538
Total received (2018-2024)
Avg $1,077/year across 7 years
Top 10% in CA for geriatric medicine (internal medicine) physician
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
52
Companies
348
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
$7,538 (100.0%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$513
2023
$1,308
2022
$1,123
2021
$1,123
2020
$849
2019
$1,235
2018
$1,388
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Radius Health, Inc.
$93
ABBVIE INC.
$82
Lilly USA, LLC
$74
Sumitomo Pharma America, Inc.
$62
Corcept Therapeutics
$53
ACADIA Pharmaceuticals Inc
$35
Insmed, Inc.
$24
Teva Pharmaceuticals USA, Inc.
$23
Otsuka America Pharmaceutical, Inc.
$20
Lundbeck LLC
$17
Bayer Healthcare Pharmaceuticals Inc.
$15
PFIZER INC.
$15
Top 3 companies account for 48.6% of 2024 payments
All-time payments by company (2018-2024) ›
ACADIA Pharmaceuticals Inc
$712
Lilly USA, LLC
$496
Avanir Pharmaceuticals, Inc.
$445
Astellas Pharma US Inc
$443
Neurocrine Biosciences, Inc.
$408
Janssen Pharmaceuticals, Inc
$364
Radius Health, Inc.
$362
Sunovion Pharmaceuticals Inc.
$317
Bayer HealthCare Pharmaceuticals Inc.
$304
Teva Pharmaceuticals USA, Inc.
$279
Amarin Pharma Inc.
$257
Boehringer Ingelheim Pharmaceuticals, Inc.
$211
Novo Nordisk Inc
$208
Novartis Pharmaceuticals Corporation
$172
Boston Scientific Corporation
$172
Xeris Pharmaceuticals, Inc.
$160
Medtronic, Inc.
$160
Amgen Inc.
$149
Vanda Pharmaceuticals Inc.
$136
Takeda Pharmaceuticals U.S.A., Inc.
$126
Alkermes, Inc.
$125
BOSTON SCIENTIFIC CORPORATION
$125
Merck Sharp & Dohme Corporation
$112
Eisai Inc.
$105
Sumitomo Pharma America, Inc.
$100
AstraZeneca Pharmaceuticals LP
$97
Otsuka America Pharmaceutical, Inc.
$96
ABBVIE INC.
$82
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$82
GlaxoSmithKline, LLC.
$75
PFIZER INC.
$72
SUN PHARMACEUTICAL INDUSTRIES INC.
$69
Bayer Healthcare Pharmaceuticals Inc.
$66
SK Life Science, Inc.
$65
Corcept Therapeutics
$53
Endogastric Solutions, Inc
$36
CMP Pharma, Inc.
$24
AbbVie Inc.
$24
Insmed, Inc.
$24
Abbott Laboratories
$24
Scilex Pharmaceuticals Inc.
$22
Inari Medical, Inc.
$22
UROVANT SCIENCES INC
$19
Hologic, LLC
$19
Bausch Health US, LLC
$18
Lundbeck LLC
$17
Kowa Pharmaceuticals America, Inc.
$16
Merck Sharp & Dohme LLC
$15
Ultragenyx Pharmaceutical Inc.
$15
MannKind Corporation
$14
Exact Sciences Corporation
$14
Medline Industries, Inc.
$11
Top 3 companies account for 21.9% of all-time payments
Associated products mentioned in payments ›
ABRE · AFREZZA · AMYVID · ANORO · ANORO ELLIPTA · APLENZIN · APTIOM · AREXVY · ARISTADA · AUSTEDO · Afinion AS100 Analyzer System · Amitiza · Arikayce · Austedo XR · BAQSIMI · BELSOMRA · BOTOX · BREZTRI · CHANTIX · Carospir · Cologuard Collection Kit · Dayvigo · ELIQUIS · ENTRESTO · ESOPHYX · EVENITY · FARXIGA · FLOWTRIEVER CATHETER · FORTEO · Fanapt · FreeStyle Libre · GEMTESA · GENERAL VASCULAR INTERVENTION · GENERAL ATHERECTOMY · GENERAL VASCULAR INTERVENTION · GENERAL BRADY · GVOKE PFS · HETLIOZ · INGREZZA · INVOKANA · JANUVIA · JARDIANCE · KAPSPARGO · KYNMOBI · Kerendia · Korlym · LATUDA · LONHALA MAGNAIR · LYRICA · Livalo · MOUNJARO · MYRBETRIQ · Myrbetriq · NUEDEXTA · NUPLAZID · NURTEC ODT · Nuedexta · Ongentys · Ozempic · Prolia · RECORLEV · REXULTI · RYBELSUS · Rybelsus · S · SPIRIVA · STIOLTO RESPIMAT · THINPREP 2000 PROCESSOR · TRADJENTA · TRELEGY ELLIPTA · TRULICITY · Tresiba · Tymlos · UBRELVY · Uloric · VESICARE · Vascepa · Veozah · XARELTO · XIFAXAN · ZTLido
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. Total industry engagement is in the top 10% for geriatric medicine (internal medicine) physician in CA.
Geographic Context
Geriatric medicine physicians within 10 mi
43
Per 100K population
1.4
County median income
$113,702
Nearest hospital
FOOTHILL REGIONAL MEDICAL CENTER
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. Chang is a clinical cardiology specialist, with above-average Medicare volume (top 23% in CA), with low-engagement industry engagement in the top 10% 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. Chang experienced with home visit, established patient, low complexity?
Based on Medicare claims data, Dr. Chang performed 931 home visit, established patient, low 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. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $7,538 from 52 companies across 348 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 geriatric medicine physicians in Tustin?
Dr. Chang's average Medicare payment per service is $73. 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.
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