Donald Lloyd Whisler, M.D.
NPI 1639516149ActiveIndividual· Internal Medicine, Rheumatology· Santa Rosa, CA
Internal Medicine, Rheumatology (M.D.) with Providence Medical Foundation, practicing in Santa Rosa, California. Their prescriptions cost Medicare Part D more than their services did: $2,158,338 for 2,120 claims, against $181,898 paid for services in 2024. Abbvie Inc. was the largest of 7 companies reporting payments in 2025, $347.17 in all, mostly food and beverage. Lists Healdsburg Hospital and 4 other hospitals as hospital affiliations.
Overview
| NPI | 1639516149 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | May 24, 2013 |
| Last updated in NPPES | Nov 11, 2021 |
| Certified by provider | Nov 11, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Rheumatology Primary | 207RR0500X | A155450 | CA |
| Student in an Organized Health Care Education/Training Program | 390200000X | — | — |
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 - Rheumatology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 457 |
|---|---|
| Services billed | 7,531 across 23 procedure codes |
| Paid by Medicare | $181,898 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,120 · 4,539 30-day fills |
|---|---|
| Patients | 396 |
| Total drug cost | $2,158,338 |
| Generic share | 81% of claims |
Education and affiliations
| Graduation year | 2013 |
|---|---|
| Medicare specialty | Rheumatology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Healdsburg HospitalHealdsburg, CA
- Mad River Community HospitalArcata, CA
- Providence Queen of the Valley Medical CenterNapa, CA
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA
- Providence St Joseph HospitalEureka, CA
Industry payments (Open Payments)
- 2025$347.17 · 16 payments from 7 companies
- 2024$144.89 · 8 payments from 1 company
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Abbvie Inc. | $143.95 | 9 |
| Janssen Biotech, Inc. | $68.99 | 1 |
| Amgen Inc. | $46.99 | 2 |
| Hydrocision, Inc. | $26.06 | 1 |
| Pfizer Inc. | $23.19 | 1 |
What the 2025 payments were for
- Food and Beverage$278.18 · 15 payments
- Education$68.99 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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