John W. Riordan, MD
NPI 1619040227ActiveIndividual· Specialist· San Francisco, CA
Specialist (MD) in San Francisco, California, trained at University of Texas Medical Branch at Galveston (class of 1987). Their prescriptions cost Medicare Part D more than their services did: $454,779 for 1,433 claims, against $223,877 paid for services in 2024. Vantive US Healthcare LLC reported $141.22 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1619040227 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Nov 15, 2006 |
| Last updated in NPPES | Jul 29, 2022 |
| Certified by provider | Jul 29, 2022 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | A52155 | 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 | 432 |
|---|---|
| Services billed | 2,049 across 23 procedure codes |
| Paid by Medicare | $223,877 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,433 · 3,733 30-day fills |
|---|---|
| Patients | 226 |
| Total drug cost | $454,779 |
| Generic share | 78% of claims |
Education and affiliations
| Medical school | University of Texas Medical Branch at Galveston |
|---|---|
| Graduation year | 1987 |
| Medicare specialty | Nephrology |
| Telehealth | Offers telehealth |
Medical group
- Renal Medical AssociatesSan Francisco, CA · 6 clinicians
Hospital affiliations
- California Pacific Medical Center - Mission BernalSan Francisco, CA
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- California Pacific Medical Ctr-Davies Campus HospSan Francisco, CA
- Stanford Health CareStanford, CA
- UCSF Medical CenterSan Francisco, CA
Other facilities
- Davita Golden Gate DialysisDialysis facility · San Francisco, CA
- Davita San Francisco DialysisDialysis facility · San Francisco, CA
- Mission DistrictDialysis facility · San Francisco, CA
Industry payments (Open Payments)
- 2025$141.22 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vantive US Healthcare LLC | $141.22 | 1 |
What the 2025 payments were for
- Food and Beverage$141.22 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other Specialist providers in San Francisco
- 1013086420
- 1134301138
- 1184674400
- 1346313269
- 1487702882
- 1528145570
- 1578632980
- 1720077480
- 1760400667
- 1821175878
- 1841350832
- 1851451934
All 735 Specialist providers in San Francisco · All Specialist providers in California