Yi Zheng, M.D.
NPI 1851622427ActiveIndividual· Internal Medicine, Gastroenterology· Walnut Creek, CA
Internal Medicine, Gastroenterology (M.D.) in Walnut Creek, California, licensed in CA, with an NPI issued in January 2010. In 2024 Medicare paid $193,321 for 565 patients, and Part D covered 928 of their prescriptions, 85% of them generic. Madrigal Pharmaceuticals was the largest of 11 companies reporting payments in 2025, $1,052 in all, mostly food and beverage. Lists John Muir Medical Center - Concord Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1851622427 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jan 21, 2010 |
| Last updated in NPPES | May 21, 2020 |
| Certified by provider | May 21, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Gastroenterology Primary | 207RG0100X | A95560 | 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 - Gastroenterology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 565 |
|---|---|
| Services billed | 1,735 across 29 procedure codes |
| Paid by Medicare | $193,321 |
Part D prescriptions in 2024
| Prescriptions (claims) | 928 · 1,506 30-day fills |
|---|---|
| Patients | 465 |
| Total drug cost | $73,469 |
| Generic share | 85% of claims |
Education and affiliations
| Graduation year | 1998 |
|---|---|
| Medicare specialty | Gastroenterology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$1,052 · 35 payments from 11 companies
- 2024$631.43 · 22 payments from 14 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Madrigal Pharmaceuticals | $357.79 | 12 |
| Ipsen Biopharmaceuticals, Inc | $251.63 | 5 |
| Takeda Pharmaceuticals U.S.A., Inc. | $124.84 | 5 |
| Janssen Biotech, Inc. | $116.33 | 5 |
| Abbvie Inc. | $43.00 | 2 |
What the 2025 payments were for
- Food and Beverage$1,052 · 35 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 41 gastroenterologists in Walnut Creek · All gastroenterologists in California