Richard Minyoung Chang, M.D.
NPI 1275669954ActiveIndividual· Internal Medicine, Interventional Cardiology· Walnut Creek, CA
Internal Medicine, Interventional Cardiology (M.D.) with John Muir Physician Network, practicing in Walnut Creek, California. Their prescriptions cost Medicare Part D more than their services did: $2,492,910 for 6,745 claims, against $552,412 paid for services in 2024. Biotronik Inc. was the largest of 30 companies reporting payments in 2025, $10,982 in all, mostly food and beverage. Lists Contra Costa Regional Medical Center and 3 other hospitals as hospital affiliations.
Overview
| NPI | 1275669954 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 26, 2007 |
| Last updated in NPPES | Aug 11, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Interventional Cardiology Primary | 207RI0011X | A83588 | CA |
| Internal Medicine | 207R00000X | A83588 | CA |
| Internal Medicine, Cardiovascular Disease | 207RC0000X | A83588 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Nov 10, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 11, 2026 | No match | — |
| New York OMIG · Nov 11, 2026 | No match | — |
| Ohio Medicaid · Nov 11, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 11, 2026 | No match | — |
| Washington HCA · Nov 11, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Other (Physician) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 1,857 |
|---|---|
| Services billed | 7,883 across 132 procedure codes |
| Paid by Medicare | $552,412 |
Part D prescriptions in 2024
| Prescriptions (claims) | 6,745 · 17,932 30-day fills |
|---|---|
| Patients | 1,086 |
| Total drug cost | $2,492,910 |
| Generic share | 75% of claims |
Education and affiliations
| Graduation year | 1999 |
|---|---|
| Medicare specialty | Undefined Physician Type (Specify) |
| Secondary specialties | Cardiovascular Disease (Cardiology) |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- Contra Costa Regional Medical CenterMartinez, CA
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- San Ramon Regional Medical CenterSan Ramon, CA
Industry payments (Open Payments)
- 2025$10,982 · 126 payments from 30 companies
- 2024$10,765 · 119 payments from 32 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Biotronik Inc. | $2,814 | 31 |
| Abbott Laboratories | $1,943 | 20 |
| Lilly USA, LLC | $1,889 | 2 |
| Boehringer Ingelheim Pharmaceuticals, Inc. | $1,341 | 6 |
| Abiomed | $412.56 | 3 |
What the 2025 payments were for
- Food and Beverage$5,683 · 114 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$3,125 · 2 payments
- Travel and Lodging$2,173 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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