Charles Allison, M.D.
NPI 1376541060ActiveIndividual· Internal Medicine· San Francisco, CA
Internal Medicine (M.D.) in San Francisco, California, trained at University of Minnesota Medical School (class of 1967). Their prescriptions cost Medicare Part D more than their services did: $538,674 for 4,666 claims, against $100,294 paid for services in 2024. Viiv Healthcare Company was the largest of 19 companies reporting payments in 2025, $1,639 in all, mostly food and beverage.
Overview
| NPI | 1376541060 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 7, 2005 |
| Last updated in NPPES | Sep 10, 2019 |
| Reactivated | Mar 29, 2006 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine Primary | 207R00000X | C33715 | 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 - Internal Medicine (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 531 |
|---|---|
| Services billed | 1,546 across 38 procedure codes |
| Paid by Medicare | $100,294 |
Part D prescriptions in 2024
| Prescriptions (claims) | 4,666 · 10,506 30-day fills |
|---|---|
| Patients | 587 |
| Total drug cost | $538,674 |
| Generic share | 85% of claims |
Education and affiliations
| Medical school | University of Minnesota Medical School |
|---|---|
| Graduation year | 1967 |
| Medicare specialty | Internal Medicine |
| Telehealth | Offers telehealth |
Medical groups
- Dignity HealthRedding, CA · 86 clinicians
- Mercy Doctors Medical Group, IncSan Francisco, CA · 8 clinicians
Hospital affiliations
- California Pacific Medical Center- Van Ness CampusSan Francisco, CA
- UCSF Health Saint Francis HospitalSan Francisco, CA
- UCSF Health St. Mary's HospitalSan Francisco, CA
- UCSF Medical CenterSan Francisco, CA
Other facilities
- Healthflex Home Health ServicesHome health agency · Oakland, CA
- Palmeira Home HealthHome health agency · San Francisco, CA
Industry payments (Open Payments)
- 2025$1,639 · 63 payments from 19 companies
- 2024$1,888 · 82 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Viiv Healthcare Company | $366.30 | 12 |
| Merck Sharp & Dohme LLC | $250.26 | 9 |
| Pfizer Inc. | $166.73 | 7 |
| Abbvie Inc. | $145.04 | 5 |
| Novo Nordisk Inc | $110.58 | 5 |
What the 2025 payments were for
- Food and Beverage$1,623 · 62 payments
- Education$15.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 1,457 internal medicine physicians in San Francisco · All internal medicine physicians in California