John Ulric Zink, MD
NPI 1366628935ActiveIndividual· Surgery· Walnut Creek, CA
Surgery (MD) in Walnut Creek, California, trained at University of Southern California Keck School of Medicine (class of 2007). Mostly services rather than prescriptions: Medicare paid $82,744 for 247 patients in 2024, with only 20 Part D claims. Intuitive Surgical, Inc. was the largest of 2 companies reporting payments in 2025, $4,428 in all, mostly education.
Overview
| NPI | 1366628935 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | Yes |
| NPI issued | Jan 14, 2008 |
| Last updated in NPPES | Feb 7, 2025 |
| Certified by provider | Feb 7, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | A124639 | 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 - General Surgery (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 247 |
|---|---|
| Services billed | 587 across 69 procedure codes |
| Paid by Medicare | $82,744 |
Part D prescriptions in 2024
| Prescriptions (claims) | 20 · 20 30-day fills |
|---|---|
| Patients | 15 |
| Total drug cost | $246.50 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | University of Southern California Keck School of Medicine |
|---|---|
| Graduation year | 2007 |
| Medicare specialty | General Surgery |
Medical groups
- Bass Medical GroupChico, CA · 291 clinicians
- John Muir Trauma Physicians Billing ServiceWalnut Creek, CA · 113 clinicians
- Medamerica Physician Solutions PCWalnut Creek, CA · 28 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
- Sutter Delta Medical CenterAntioch, CA
Industry payments (Open Payments)
- 2025$4,428 · 6 payments from 2 companies
- 2024$17,279 · 42 payments from 2 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Intuitive Surgical, Inc. | $4,406 | 5 |
| Smith+nephew, Inc. | $21.83 | 1 |
What the 2025 payments were for
- Education$4,000 · 3 payments
- Travel and Lodging$304.73 · 1 payment
- Food and Beverage$123.08 · 2 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 46 general surgeons in Walnut Creek · All general surgeons in California