Medicare Enrolled
Dr. Oscar Chien, M.D.
Geriatric Medicine (Internal Medicine) Physician · San Gabriel, 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. Chien 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. Chien
Dr. Oscar Chien is a geriatric medicine physician in San Gabriel, CA, with 19 years of NPI registration. Based on federal Medicare data, Dr. Chien performed 6,192 Medicare services across 2,085 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chien received a total of $255,128 from 79 pharmaceutical and/or device companies across 1429 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in geriatric medicine (internal medicine) physician. 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. Chien 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 9% volume in CA
$255,128 industry payments
Medicare Practice Summary
Medicare Utilization ↗6,192
Medicare services
Top 9% in CA for geriatric medicine (internal medicine) physician
2,085
Unique beneficiaries
$70
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~326 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 |
|---|---|---|---|
| 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. |
1,897 | $65 | $126 |
| 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. |
1,521 | $67 | $100 |
| Nursing facility visit, high complexity A follow-up visit by a healthcare provider at a nursing facility for an established patient. The visit involves a high level of medical decision making and takes at least 45 minutes. |
1,003 | $81 | $104 |
| 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. |
314 | $50 | $75 |
| 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. |
204 | $144 | $264 |
| Hospital discharge management, 30+ min This service covers the care provided by a physician or qualified healthcare professional on the day a patient is discharged from the hospital. It requires more than 30 minutes of total time spent on the day of discharge. |
180 | $90 | $167 |
| 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. |
177 | $119 | $153 |
| 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. |
144 | $88 | $180 |
| Home health plan of care re-certification A physician reviews the patient's status and contacts the home health agency to re-certify the plan of care without the patient being present. |
141 | $34 | $80 |
| 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. |
107 | $32 | $35 |
| Flu vaccine administration This procedure involves the administration of the influenza virus vaccine. It covers the process of delivering the vaccine to the patient. |
107 | $10 | $10 |
| Telephone medical discussion, 11-20 minutes A phone conversation with a physician lasting between 11 and 20 minutes. |
93 | $33 | $75 |
| Telephone medical discussion, 21-30 minutes A telephone conversation with a physician lasting between 21 and 30 minutes. This code covers the time spent discussing medical matters over the phone. |
89 | $32 | $100 |
| Advance care planning consultation, first 30 min A session focused on discussing and documenting future healthcare preferences and goals. This service covers the initial 30 minutes of the planning discussion. |
34 | $87 | $100 |
| Annual alcohol misuse screening, 5 to 15 minutes | 34 | $21 | $40 |
| Annual intensive behavioral therapy for cardiovascular disease, 15 minutes A yearly, in-person session focused on intensive behavioral therapy to help manage cardiovascular disease. The session lasts for 15 minutes and is conducted with the patient individually. |
34 | $28 | $60 |
| Annual wellness visit, follow-up A follow-up annual wellness visit that includes a personalized prevention plan of service. |
30 | $140 | $150 |
| New patient office visit, complex (60-74 min) | 29 | $160 | $250 |
| Annual depression screening | 23 | $5 | $5 |
| 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. |
20 | $91 | $120 |
| 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. |
11 | $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 ↗$255,128
Total received (2018-2024)
Avg $36,447/year across 7 years
Top 1% in CA for geriatric medicine (internal medicine) physician
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
79
Companies
1,429
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
$227,351 (89.1%)
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$19,901 (7.8%)
Consulting
Expert advisory fees, typically reflecting recognized clinical expertise
$7,875 (3.1%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$27,480
2023
$19,349
2022
$21,156
2021
$23,539
2020
$26,736
2019
$76,106
2018
$60,762
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
Amgen Inc.
$8,289
Phathom Pharmaceuticals, Inc.
$6,422
Sumitomo Pharma America, Inc.
$4,704
ABBVIE INC.
$2,012
VIVUS LLC
$1,409
IRONWOOD PHARMACEUTICALS, INC
$1,030
AstraZeneca Pharmaceuticals LP
$946
Teva Pharmaceuticals USA, Inc.
$340
GlaxoSmithKline, LLC.
$254
AIMMUNE THERAPEUTICS, INC.
$250
Novartis Pharmaceuticals Corporation
$249
Eisai Inc.
$249
Bayer Healthcare Pharmaceuticals Inc.
$209
Boehringer Ingelheim Pharmaceuticals, Inc.
$191
Novo Nordisk Inc
$171
Lilly USA, LLC
$162
Ardelyx, Inc.
$156
Esperion Therapeutics, Inc.
$125
Mylan Specialty L.P.
$117
Radius Health, Inc.
$91
Mannkind Corporation
$25
Lundbeck LLC
$22
ORPHALAN INC
$21
PFIZER INC.
$18
Kowa Pharmaceuticals America, Inc.
$17
Top 3 companies account for 70.7% of 2024 payments
All-time payments by company (2018-2024) ›
Radius Health, Inc.
$48,200
Amgen Inc.
$43,498
Gilead Sciences, Inc.
$23,804
Janssen Pharmaceuticals, Inc
$19,230
Amarin Pharma Inc.
$18,048
AbbVie Inc.
$12,327
AbbVie, Inc.
$10,958
Allergan, Inc.
$7,945
UROVANT SCIENCES INC
$7,801
IDORSIA PHARMACEUTICALS US INC
$7,718
Allergan Inc.
$6,767
Sumitomo Pharma America, Inc.
$6,675
Phathom Pharmaceuticals, Inc.
$6,422
Ironwood Pharmaceuticals, Inc
$5,321
VIVUS LLC
$4,914
ABBVIE INC.
$4,106
AstraZeneca Pharmaceuticals LP
$2,681
Teva Pharmaceuticals USA, Inc.
$1,546
Biohaven Pharmaceuticals, Inc.
$1,288
Novo Nordisk Inc
$1,212
Astellas Pharma US Inc
$1,201
Lilly USA, LLC
$1,186
IRONWOOD PHARMACEUTICALS, INC
$1,151
Boehringer Ingelheim Pharmaceuticals, Inc.
$1,083
SANOFI-AVENTIS U.S. LLC
$877
GlaxoSmithKline, LLC.
$852
PFIZER INC.
$716
Bayer Healthcare Pharmaceuticals Inc.
$512
Mylan Specialty L.P.
$483
Novartis Pharmaceuticals Corporation
$455
CMP Pharma, Inc.
$441
Salix Pharmaceuticals, a division of Bausch Health US, LLC
$400
Sunovion Pharmaceuticals Inc.
$398
Takeda Pharmaceuticals U.S.A., Inc.
$394
Bayer HealthCare Pharmaceuticals Inc.
$374
Kowa Pharmaceuticals America, Inc.
$357
Eisai Inc.
$288
Merck Sharp & Dohme Corporation
$280
Lexicon Pharmaceuticals, Inc.
$271
AIMMUNE THERAPEUTICS, INC.
$250
CeQur Corporation
$233
Esperion Therapeutics, Inc.
$232
Otsuka America Pharmaceutical, Inc.
$203
Regeneron Healthcare Solutions, Inc.
$188
Ardelyx, Inc.
$156
NESTLE HEALTHCARE NUTRITION INC.
$125
PORTOLA PHARMACEUTICALS, INC.
$124
Dexcom, Inc.
$124
Nestle HealthCare Nutrition Inc.
$123
RedHill Biopharma Inc.
$117
Avanir Pharmaceuticals, Inc.
$115
Corium, LLC
$110
Philips Electronics North America Corporation
$104
Horizon Therapeutics plc
$71
E.R. Squibb & Sons, L.L.C.
$67
Biohaven Pharmaceutical Holding Company Ltd.
$56
Hikma Pharmaceuticals USA
$52
Abbott Laboratories
$52
Alkermes, Inc.
$39
BOSTON SCIENTIFIC CORPORATION
$32
Smith+Nephew, Inc.
$29
Mannkind Corporation
$25
Neurocrine Biosciences, Inc.
$24
Xeris Pharmaceuticals, Inc.
$22
Eyevance Pharmaceuticals LLC
$22
Lundbeck LLC
$22
ITI, Inc.
$22
EISAI INC.
$22
ORPHALAN INC
$21
SCILEX PHARMACEUTICALS INC.
$20
Biogen, Inc.
$19
Medicure Pharma Inc.
$19
DEXCOM, INC.
$18
SANOFI PASTEUR INC.
$18
Merck Sharp & Dohme LLC
$18
ACADIA Pharmaceuticals Inc
$15
Scilex Pharmaceuticals Inc.
$14
West-Ward Pharmaceuticals
$13
IBSA Pharma Inc.
$11
Top 3 companies account for 45.3% of all-time payments
Associated products mentioned in payments ›
(7999) SRC Undivided · (8876) Vest Therapy Und · ADLARITY · ADUHELM · AFREZZA · AIRSUPRA · AMITIZA · AMYVID · APTIOM · AREXVY · AUSTEDO · AVYCAZ · Adlarity · Aduhelm · Aimovig · Amitiza · Austedo XR · BAQSIMI · BASAGLAR · BELSOMRA · BEVYXXA · BREZTRI · BRILINTA · BYSTOLIC · CAPLYTA · CAROSPIR · CHANTIX · COLLAGENASE SANTYL · COLOGUARD · CREON · CUVRIOR · Carospir · CeQur Simplicity · Creon · DALVANCE · DEXCOM G6 TRANSMITTER · DEXCOM G7 GSS (161) · DIFICID · DUZALLO · Dayvigo · Descovy · Dexcom G6 Transmitter · Dexilant · ELIQUIS · EMGALITY · ENTRESTO · EUCRISA · EVENITY · Epclusa · FARXIGA · FLUZONE QUADRIVALENT · FORTEO · FREESTYLE LIBRE 2 · GEMTESA · GVOKE PFS · HUMALOG · IBSRELA · INVOKANA · Infinity DBS Pulse Generators · Inpefa · JANUVIA · JARDIANCE · KYNMOBI · Kerendia · LEQVIO · LINZESS · LONHALA MAGNAIR · LYBALVI · LYRICA · Leqembi · Licart · Linzess · Livalo · MOTEGRITY · MOUNJARO · MYRBETRIQ · Mavyret · Mitigare · Motegrity · Myrbetriq · NEXLETOL · NEXLIZET · NUEDEXTA · NUPLAZID · NURTEC ODT · Norliqva · Nuedexta · Ongentys · Otezla · Ozempic · PANCREAZE · PAXLOVID · PENNSAID · PNEUMOVAX 23 · PRALUENT · PRALUENT ALIROCUMAB INJECTION · Pancreaze · Prolia · QTERN · QULIPTA · QUVIVIQ · REXULTI · RYBELSUS · Ranexa · Repatha · Rybelsus · SHINGRIX · SOLIQUA 100/33 · STIOLTO RESPIMAT · SYMBICORT · Seglentis · Superion · TEFLARO · TOUJEO · TRADJENTA · TRELEGY ELLIPTA · TRINTELLIX · TRULANCE · TRULICITY · Talicia · Tobradex ST · Trintellix · Tymlos · UBRELVY · VIBERZI · VOQUEZNA · VRAYLAR · Vascepa · Vemlidy · Victoza · XARELTO · XIFAXAN · YUPELRI · Yupelri · ZENPEP · ZERBAXA · ZORYVE · ZTLido · ZYPITAMAG · inCourage
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 (89%) are for speaking programs and promotional activities, which reflect participation in industry-sponsored educational or marketing events. This is common in geriatric medicine (internal medicine) physician and does not inherently indicate bias, but patients may wish to be aware. Total industry engagement is in the top 1% for geriatric medicine (internal medicine) physician in CA.
Geographic Context
Geriatric medicine physicians within 10 mi
150
Per 100K population
1.5
County median income
$87,760
Nearest hospital
SAN GABRIEL VALLEY 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. Chien is a clinical cardiology specialist, with above-average Medicare volume (top 9% in CA), with speaking/promotional industry engagement in the top 1% 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. Chien experienced with hospital follow-up visit, moderate complexity?
Based on Medicare claims data, Dr. Chien performed 1,897 hospital follow-up visit, moderate 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. Chien receive payments from pharmaceutical companies?
Yes. Dr. Chien received a total of $255,128 from 79 companies across 1,429 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. Chien's costs compare to other geriatric medicine physicians in San Gabriel?
Dr. Chien's average Medicare payment per service is $70. 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. Chien) 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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