Hennessey Tseng, M.D.
NPI 1003811746ActiveIndividual· Internal Medicine, Cardiovascular Disease· Walnut Creek, CA
Internal Medicine, Cardiovascular Disease (M.D.) in Walnut Creek, California, trained at Emory University School of Medicine (class of 1995). Their prescriptions cost Medicare Part D more than their services did: $1,283,789 for 5,239 claims, against $411,171 paid for services in 2024. Aop Health US, LLC was the largest of 30 companies reporting payments in 2025, $3,392 in all, mostly food and beverage.
Overview
| NPI | 1003811746 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jun 17, 2005 |
| Last updated in NPPES | Aug 11, 2015 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Cardiovascular Disease Primary | 207RC0000X | G86069 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Cardiovascular Disease (Cardiology) (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 2,184 |
|---|---|
| Services billed | 6,465 across 62 procedure codes |
| Paid by Medicare | $411,171 |
Part D prescriptions in 2024
| Prescriptions (claims) | 5,239 · 13,180 30-day fills |
|---|---|
| Patients | 888 |
| Total drug cost | $1,283,789 |
| Generic share | 79% of claims |
Education and affiliations
| Medical school | Emory University School of Medicine |
|---|---|
| Graduation year | 1995 |
| Medicare specialty | Cardiovascular Disease (Cardiology) |
| Telehealth | Offers telehealth |
Medical group
- John Muir Physician NetworkPleasant Hill, CA · 494 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- Kaiser Foundation Hospital - AntiochAntioch, CA
- Sutter Delta Medical CenterAntioch, CA
Industry payments (Open Payments)
- 2025$3,392 · 113 payments from 30 companies
- 2024$2,323 · 125 payments from 28 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Aop Health US, LLC | $812.06 | 1 |
| Novartis Pharmaceuticals Corporation | $302.25 | 14 |
| Biotronik Inc. | $251.51 | 2 |
| Bayer Healthcare Pharmaceuticals Inc. | $178.33 | 10 |
| E.R. Squibb & Sons, L.L.C. | $177.89 | 9 |
What the 2025 payments were for
- Food and Beverage$3,392 · 113 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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