Ian Churchill Anderson, M.D.
NPI 1518055573ActiveIndividual· Internal Medicine, Hematology & Oncology· Santa Rosa, CA
Internal Medicine, Hematology & Oncology (M.D.) in Santa Rosa, California, trained at Duke University School of Medicine (class of 1988). Their prescriptions cost Medicare Part D more than their services did: $5,747,660 for 2,030 claims, against $195,376 paid for services in 2024. Daiichi Sankyo Inc. was the largest of 15 companies reporting payments in 2025, $778.08 in all, mostly food and beverage.
Overview
| NPI | 1518055573 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Oct 11, 2006 |
| Last updated in NPPES | Oct 14, 2021 |
| Certified by provider | Oct 14, 2021 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Internal Medicine, Hematology & Oncology Primary | 207RH0003X | A49481 | CA |
| Internal Medicine, Hematology | 207RH0000X | A49481 | CA |
| Internal Medicine, Medical Oncology | 207RX0202X | A49481 | CA |
Exclusion screening
| List | Result | Details |
|---|---|---|
| HHS-OIG LEIE · Oct 9, 2026 | No match | Checked by NPI and by name + state |
| North Carolina Medicaid · Nov 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 2026 | No match | — |
Official OIG search · How matching works ·Bulk check a roster
Medicare
| Enrollment (PECOS) | Enrolled Practitioner - Hematology/Oncology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 630 |
|---|---|
| Services billed | 1,963 across 17 procedure codes |
| Paid by Medicare | $195,376 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,030 · 2,592 30-day fills |
|---|---|
| Patients | 366 |
| Total drug cost | $5,747,660 |
| Generic share | 77% of claims |
Education and affiliations
| Medical school | Duke University School of Medicine |
|---|---|
| Graduation year | 1988 |
| Medicare specialty | Hematology/Oncology |
| Secondary specialties | Internal Medicine, Medical Oncology |
| Telehealth | Offers telehealth |
Medical group
- Providence Medical FoundationVictorville, CA · 1,466 clinicians
Hospital affiliations
- Adventist Health Mendocino CoastFort Bragg, CA
- Healdsburg HospitalHealdsburg, CA
- Petaluma Valley HospitalPetaluma, CA
- Providence Santa Rosa Memorial HospitalSanta Rosa, CA
- Sonoma Valley HospitalSonoma, CA
Industry payments (Open Payments)
- 2025$778.08 · 30 payments from 15 companies
- 2024$604.16 · 22 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Daiichi Sankyo Inc. | $160.78 | 7 |
| Astrazeneca Pharmaceuticals LP | $89.03 | 4 |
| Regeneron Pharmaceuticals, Inc. | $79.65 | 2 |
| Gilead Sciences, Inc. | $67.35 | 3 |
| Takeda Pharmaceuticals U.S.A., Inc. | $62.17 | 3 |
What the 2025 payments were for
- Food and Beverage$722.58 · 29 payments
- Education$55.50 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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