Medicare Enrolled
Dr. Paul Chang, M.D.
Internal Medicine · Buena Park, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Speaking/Promotional
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. Paul Chang is an internal medicine specialist in Buena Park, CA, with 20 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 2,964 Medicare services across 1,574 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $62,072 from 67 pharmaceutical and/or device companies across 1560 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in internal medicine. The majority of payments are for speaking programs and promotional activities, reflecting participation in industry-sponsored events. 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.
✓ 20 years in practice
▲ Top 11% volume in CA
$62,072 industry payments
Medicare Practice Summary
Medicare Utilization ↗2,964
Medicare services
Top 11% in CA for internal medicine
1,574
Unique beneficiaries
$62
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~148 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. |
1,062 | $71 | $105 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
285 | $140 | $300 |
| Remote patient monitoring management, 20 min/month Management based on results from remote vital sign monitoring for the first 20 minutes per calendar month. |
182 | $41 | $85 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
173 | $29 | $30 |
| Remote vital sign monitoring management, each additional 20 minutes This code covers the time spent by a provider managing patient data from remote vital sign monitoring devices. It applies to each additional 20-minute increment beyond the initial monthly service period. |
165 | $33 | $50 |
| Remote patient monitoring device, 30 days Initial setup of devices for remote monitoring of body functions with daily data transmission or alerts. This service covers the first 30 days of the monitoring period. |
129 | $44 | $75 |
| Flu vaccine, quadrivalent A flu shot containing four strains of the influenza virus to help prevent seasonal influenza infection. |
126 | $76 | $80 |
| Joint injection, major joint Removal of fluid from a large joint and/or injection of medication into the joint space. |
120 | $56 | $120 |
| Viscosupplementation injection for joint An injection of hyaluronic acid or a derivative into a joint to provide lubrication and cushioning. |
120 | $56 | $100 |
| 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. |
113 | $48 | $70 |
| Urine microalbumin test A laboratory test that measures the amount of a specific protein called microalbumin in a urine sample. This analysis helps assess kidney function. |
101 | $6 | $10 |
| Complete ultrasound of abdomen A diagnostic imaging test that uses sound waves to create detailed pictures of the organs and structures within the abdomen. |
75 | $92 | $185 |
| Automated urinalysis An automated laboratory test performed on a urine sample to analyze its chemical and physical properties. The procedure uses machinery to detect various substances and cells within the urine. |
75 | $2 | $5 |
| 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. |
72 | $12 | $35 |
| Quadrivalent influenza vaccine, cell culture-derived A flu shot that protects against four strains of the influenza virus. It is produced using cell culture technology rather than traditional egg-based methods. |
47 | $32 | $40 |
| 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. |
36 | $12 | $30 |
| Echocardiogram, transthoracic An ultrasound of the heart that uses color to show blood flow, rate, direction, and valve function. |
29 | $160 | $300 |
| 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. |
19 | $36 | $84 |
| Vitamin B-12 injection An injection of vitamin B-12 (cyanocobalamin) with a dose of up to 1000 mcg. |
18 | $1 | $10 |
| Creatinine test (kidney function) A blood test that measures the amount of creatinine to assess kidney function or detect muscle injury. |
17 | $5 | $8 |
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.
1.0% high complexity
13.7% medium
85.4% routine
Industry Payment Transparency
Open Payments through 2024 ↗$62,072
Total received (2018-2024)
Avg $8,867/year across 7 years
Top 3% in CA for internal medicine
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
67
Companies
1,560
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.
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$37,280 (60.1%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$24,792 (39.9%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$2,574
2023
$10,021
2022
$7,825
2021
$8,219
2020
$6,831
2019
$13,587
2018
$13,015
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Boehringer Ingelheim Pharmaceuticals, Inc.
$284
ABBVIE INC.
$244
Amgen Inc.
$196
AstraZeneca Pharmaceuticals LP
$179
Novo Nordisk Inc
$166
Ardelyx, Inc.
$158
Astellas Pharma US Inc
$149
Radius Health, Inc.
$109
IRONWOOD PHARMACEUTICALS, INC
$107
Novartis Pharmaceuticals Corporation
$96
Lilly USA, LLC
$94
GlaxoSmithKline, LLC.
$93
IDORSIA PHARMACEUTICALS US INC
$70
Merck Sharp & Dohme LLC
$62
Sumitomo Pharma America, Inc.
$57
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$56
SCILEX PHARMACEUTICALS INC.
$53
Gilead Sciences, Inc.
$48
PFIZER INC.
$48
ABIOMED
$44
Bayer Healthcare Pharmaceuticals Inc.
$40
Eisai Inc.
$31
ORPHALAN INC
$30
Exact Sciences Corporation
$30
Biogen, Inc.
$28
Dexcom, Inc.
$24
VIVUS LLC
$22
Otsuka America Pharmaceutical, Inc.
$21
Kowa Pharmaceuticals America, Inc.
$19
PROGENICS PHARMACEUTICALS, INC.
$16
Top 3 companies account for 28.2% of 2024 payments
All-time payments by company (2018-2024) ›
Gilead Sciences, Inc.
$37,179
Amgen Inc.
$2,882
AstraZeneca Pharmaceuticals LP
$1,753
Boehringer Ingelheim Pharmaceuticals, Inc.
$1,626
Janssen Pharmaceuticals, Inc
$1,419
PFIZER INC.
$1,335
Novo Nordisk Inc
$1,190
AbbVie Inc.
$1,152
Novartis Pharmaceuticals Corporation
$993
ABBVIE INC.
$962
Amarin Pharma Inc.
$882
Lilly USA, LLC
$838
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$772
GlaxoSmithKline, LLC.
$772
Radius Health, Inc.
$727
Takeda Pharmaceuticals U.S.A., Inc.
$626
Ironwood Pharmaceuticals, Inc
$577
Scilex Pharmaceuticals Inc.
$503
Dexcom, Inc.
$483
Bayer HealthCare Pharmaceuticals Inc.
$474
Merck Sharp & Dohme Corporation
$344
IDORSIA PHARMACEUTICALS US INC
$282
Allergan Inc.
$274
Merck Sharp & Dohme LLC
$256
AbbVie, Inc.
$252
SCILEX PHARMACEUTICALS INC.
$234
VIVUS LLC
$230
Medicure Pharma Inc.
$213
IRONWOOD PHARMACEUTICALS, INC
$209
DEXCOM, INC.
$169
Astellas Pharma US Inc
$162
Ardelyx, Inc.
$158
Allergan, Inc.
$152
Eisai Inc.
$147
ABIOMED
$139
Nestle HealthCare Nutrition Inc.
$125
Avanir Pharmaceuticals, Inc.
$125
Medtronic Vascular, Inc.
$123
Bayer Healthcare Pharmaceuticals Inc.
$123
Regeneron Healthcare Solutions, Inc.
$122
ACADIA Pharmaceuticals Inc
$120
Otsuka America Pharmaceutical, Inc.
$103
Biohaven Pharmaceuticals, Inc.
$85
SANOFI-AVENTIS U.S. LLC
$83
Boston Scientific Corporation
$66
IBSA Pharma Inc.
$63
Sumitomo Pharma America, Inc.
$57
Kowa Pharmaceuticals America, Inc.
$52
NESTLE HEALTHCARE NUTRITION INC.
$51
Exact Sciences Corporation
$46
Synergy Pharmaceuticals Inc
$40
SANOFI PASTEUR INC.
$32
ORPHALAN INC
$30
Esperion Therapeutics, Inc.
$30
Biogen, Inc.
$28
Biohaven Pharmaceutical Holding Company Ltd.
$24
Sun Pharmaceutical Industries Inc.
$23
Seqirus USA Inc
$22
OPKO Pharmaceuticals, LLC
$21
Optos, Inc.
$20
Arbor Pharmaceuticals, Inc.
$20
Medtronic MiniMed, Inc.
$18
Bausch Health US, LLC
$17
PROGENICS PHARMACEUTICALS, INC.
$16
ARBOR PHARMACEUTICALS, INC.
$12
Endogastric Solutions, Inc
$10
Forte Bio-Pharma LLC
$0
Top 3 companies account for 67.4% of all-time payments
Associated products mentioned in payments ›
ADVAIR · AIRSUPRA · ANORO · APLENZIN · APRISO · AREXVY · AVYCAZ · Aimovig · Amitiza · BAQSIMI · BASAGLAR · BELSOMRA · BEVESPI AEROSPHERE · BEXSERO · BREATHTEK · BREZTRI · BREZTRI AEROSPHERE · BYSTOLIC · CHANTIX · COMIRNATY · CREON · CUVRIOR · ClosureRFS · Cologuard Collection Kit · Creon · DALVANCE · DEXCOM G6 TRANSMITTER · Dayvigo · Dexcom G6 Transmitter · Dexilant · ELIQUIS · EMGALITY · ENTRESTO · ESOPHYX · EUCRISA · EVENITY · EZALLOR SPRINKLE · Edarbi · Epclusa · FARXIGA · FLUBLOK QUADRIVALENT NORTHERN HEMISPHERE · FLULAVAL · FLUZONE HIGH-DOSE · Fluad · GARDASIL · GARDASIL 9 · GEMTESA · HMG-CoA reductase inhibitor. · IBSRELA · INVOKANA · Impella · JANUVIA · JARDIANCE · Kerendia · LEQEMBI · LEQVIO · LICART · LINZESS · LIVALO · LYRICA · Leqembi · Linzess · MOTEGRITY · MOUNJARO · MOVANTIK · Motegrity · NEXLETOL · NUEDEXTA · NUPLAZID · NURTEC ODT · Nalocet · Otezla · Ozempic · P200DTx · PNEUMOVAX 23 · PRALUENT ALIROCUMAB INJECTION · PREVNAR - 13 · PREVNAR 13 · PREVNAR 20 · PYLARIFY · Prolia · QSYMIA · QULIPTA · QUVIVIQ · Qsymia · RAYALDEE · REXULTI · RYBELSUS · Repatha · Rybelsus · SEGLENTIS · SHINGRIX · SOLIQUA 100/33 · STEGLATRO · STIOLTO RESPIMAT · SYMBICORT · TOUJEO · TOVIAZ · TRADJENTA · TRELEGY ELLIPTA · TRULANCE · TRULICITY · Tresiba · Trintellix · Trulance · Tymlos · UBRELVY · VERQUVO · VIAGRA · VIBERZI · VRAYLAR · Vascepa · Vemlidy · VenaSeal · Veozah · Victoza · WaveWriter Alpha Prime 16 · Wegovy · XARELTO · XIFAXAN · ZENPEP · ZORYVE · ZTLido · ZTLido 30 POUCH in 1 CARTON 1 PATCH in 1 POUCH · iPro2
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 (60%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in internal medicine and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 3% for internal medicine in CA.
Geographic Context
Internal medicine physicians within 10 mi
4,254
Per 100K population
134.4
County median income
$113,702
Nearest hospital
AHMC ANAHEIM REGIONAL MEDICAL CENTER
3.1 mi
3.1 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 11% in CA), with speaking/promotional industry engagement in the top 3% of CA peers, 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. Chang experienced with office visit, established patient (20-29 min)?
Based on Medicare claims data, Dr. Chang performed 1,062 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 $62,072 from 67 companies across 1,560 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 internal medicine physicians in Buena Park?
Dr. Chang's average Medicare payment per service is $62. 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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