Nolli Silva Riordan, M.D.
NPI 1124110192ActiveIndividual· Surgery· Alameda, CA
Surgery (M.D.) in Alameda, California, trained at University of Hawaii John A. Burns School of Medicine (class of 1993). Mostly services rather than prescriptions: Medicare paid $5,483 for 25 patients in 2024, with only 21 Part D claims. Octapharma USA, Inc. reported $15.53 in payments in 2025, mostly food and beverage.
Overview
| NPI | 1124110192 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | Yes |
| NPI issued | Sep 28, 2006 |
| Last updated in NPPES | Jun 5, 2020 |
| Certified by provider | Jun 5, 2020 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | G81855 | 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 | 25 |
|---|---|
| Services billed | 52 across 20 procedure codes |
| Paid by Medicare | $5,483 |
Part D prescriptions in 2024
| Prescriptions (claims) | 21 · 22 30-day fills |
|---|---|
| Total drug cost | $51.05 |
| Generic share | 100% of claims |
Education and affiliations
| Medical school | University of Hawaii John A. Burns School of Medicine |
|---|---|
| Graduation year | 1993 |
| Medicare specialty | General Surgery |
Medical group
- East Bay Cardiovascular and Thoracic Associates IncDanville, CA · 17 clinicians
Hospital affiliations
- John Muir Medical Center - Concord CampusConcord, CA
- San Ramon Regional Medical CenterSan Ramon, CA
Industry payments (Open Payments)
- 2025$15.53 · 1 payment from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Octapharma USA, Inc. | $15.53 | 1 |
What the 2025 payments were for
- Food and Beverage$15.53 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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