Ari D. Baron, M.D.
NPI 1013086420ActiveIndividual· Specialist· San Francisco, CA
Specialist (M.D.) in San Francisco, California, trained at Tufts University School of Medicine (class of 1990). Their prescriptions cost Medicare Part D more than their services did: $16,390,699 for 2,751 claims, against $2,447,280 paid for services in 2024. E.R. Squibb & Sons, L.L.C. was the largest of 40 companies reporting payments in 2025, $81,979 in all, mostly speaking and faculty fees.
Overview
| NPI | 1013086420 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Nov 7, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Specialist Primary | 174400000X | G72619 | 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 4, 2026 | No match | — |
| New York OMIG · Nov 4, 2026 | No match | — |
| Ohio Medicaid · Nov 4, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 4, 2026 | No match | — |
| Washington HCA · Nov 4, 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 | 584 |
|---|---|
| Services billed | 143,015 across 109 procedure codes |
| Paid by Medicare | $2,447,280 |
Part D prescriptions in 2024
| Prescriptions (claims) | 2,751 · 3,416 30-day fills |
|---|---|
| Patients | 274 |
| Total drug cost | $16,390,699 |
| Generic share | 37% of claims |
Education and affiliations
| Medical school | Tufts University School of Medicine |
|---|---|
| Graduation year | 1990 |
| Medicare specialty | Hematology/Oncology |
| Telehealth | Offers telehealth |
Medical groups
- Sutter Bay Medical FoundationFremont, CA · 3,829 clinicians
- Pacific Hematology Oncology Assoc.San Francisco, CA · 3 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
- Novato Community HospitalNovato, CA
- Peninsula Medical CenterBurlingame, CA
Industry payments (Open Payments)
- 2025$81,979 · 127 payments from 40 companies
- 2024$49,173 · 116 payments from 38 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| E.R. Squibb & Sons, L.L.C. | $46,675 | 30 |
| Astellas Pharma US Inc | $11,065 | 9 |
| Abbvie Inc. | $10,048 | 15 |
| Incyte Corporation | $6,993 | 12 |
| Bayer Healthcare Pharmaceuticals Inc. | $5,492 | 6 |
What the 2025 payments were for
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$62,185 · 17 payments
- Consulting Fee$14,868 · 11 payments
- Food and Beverage$3,391 · 77 payments
- Travel and Lodging$1,535 · 22 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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