Kok-Tong Ling, M.D.
NPI 1164400263ActiveIndividual· Internal Medicine, Nephrology· San Francisco, CA
Internal Medicine, Nephrology (M.D.) with Regents of the University of California, practicing in San Francisco, California. Their prescriptions cost Medicare Part D more than their services did: $334,811 for 615 claims, against $78,353 paid for services in 2024. Amgen Inc. was the largest of 3 companies reporting payments in 2025, $153.55 in all, mostly food and beverage. Lists California Pacific Medical Center- Van Ness Campus and 1 other hospital as hospital affiliations.
Overview
| NPI | 1164400263 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Jan 9, 2006 |
| Last updated in NPPES | Oct 24, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Nephrology Primary | 207RN0300X | A45478 | CA |
| Internal Medicine | 207R00000X | A45478 | 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 - Nephrology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 69 |
|---|---|
| Services billed | 618 across 9 procedure codes |
| Paid by Medicare | $78,353 |
Part D prescriptions in 2024
| Prescriptions (claims) | 615 · 1,562 30-day fills |
|---|---|
| Patients | 76 |
| Total drug cost | $334,811 |
| Generic share | 74% of claims |
Education and affiliations
| Graduation year | 1984 |
|---|---|
| Medicare specialty | Nephrology |
| Secondary specialties | Internal Medicine |
Medical group
- Regents of the University of CaliforniaSan Francisco, CA · 732 clinicians
Hospital affiliations
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- Chinese HospitalSan Francisco, CA
Other facilities
- Shc San FranciscoDialysis facility · San Francisco, CA
Industry payments (Open Payments)
- 2025$153.55 · 6 payments from 3 companies
- 2024$567.82 · 11 payments from 3 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $68.29 | 3 |
| Astrazeneca Pharmaceuticals LP | $59.81 | 2 |
| Ardelyx, Inc. | $25.45 | 1 |
What the 2025 payments were for
- Food and Beverage$153.55 · 6 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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