Yenjean Hwang, M.D.
NPI 1194744557ActiveIndividual· Internal Medicine, Infectious Disease· Oakland, CA
Internal Medicine, Infectious Disease (M.D.) in Oakland, California, trained at University of Chicago, Pritzker School of Medicine (class of 1994). In 2024 Medicare paid $126,461 for 318 patients, and Part D covered 1,709 of their prescriptions, 89% of them generic. Insmed, Inc. was the largest of 10 companies reporting payments in 2025, $286.20 in all, mostly food and beverage.
Overview
| NPI | 1194744557 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 18, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Infectious Disease Primary | 207RI0200X | A68164 | 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 - Infectious Disease (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 318 |
|---|---|
| Services billed | 1,147 across 27 procedure codes |
| Paid by Medicare | $126,461 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,709 · 2,798 30-day fills |
|---|---|
| Patients | 220 |
| Total drug cost | $140,697 |
| Generic share | 89% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1994 |
| Medicare specialty | Infectious Disease |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Whiting and Whiting, A Professional CorpOrinda, CA · 2 clinicians
Hospital affiliations
- Alta Bates Summit Medical CenterOakland, CA
- Alta Bates Summit Medical Center - Alta Bates CampBerkeley, CA
- Eden Medical CenterCastro Valley, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- Stanford Health CareStanford, CA
Other facilities
- Comfort Assisting, IncHome health agency · Walnut Creek, CA
- Sutter Care at HomeHome health agency · Concord, CA
Industry payments (Open Payments)
- 2025$286.20 · 12 payments from 10 companies
- 2024$2,507 · 21 payments from 11 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Insmed, Inc. | $48.50 | 2 |
| Takeda Pharmaceuticals U.S.A., Inc. | $32.06 | 1 |
| Abbvie Inc. | $31.58 | 2 |
| La Jolla Pharmaceutical Company | $31.01 | 1 |
| Novo Nordisk Inc | $30.72 | 1 |
What the 2025 payments were for
- Food and Beverage$286.20 · 12 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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