Ronald A. Simon, M.D.
NPI 1255304622ActiveIndividual· Allergy & Immunology· San Diego, CA
Allergy & Immunology (M.D.) in San Diego, California, trained at University of Chicago, Pritzker School of Medicine (class of 1974). Their prescriptions cost Medicare Part D more than their services did: $283,251 for 585 claims, against $170,098 paid for services in 2024. Genzyme Corporation was the largest of 11 companies reporting payments in 2025, $1,129 in all, mostly food and beverage.
Overview
| NPI | 1255304622 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Feb 8, 2006 |
| Last updated in NPPES | Jul 5, 2018 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | G31303 | 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 - Allergy/Immunology (CA) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 203 |
|---|---|
| Services billed | 9,674 across 36 procedure codes |
| Paid by Medicare | $170,098 |
Part D prescriptions in 2024
| Prescriptions (claims) | 585 · 836 30-day fills |
|---|---|
| Patients | 159 |
| Total drug cost | $283,251 |
| Generic share | 59% of claims |
Education and affiliations
| Medical school | University of Chicago, Pritzker School of Medicine |
|---|---|
| Graduation year | 1974 |
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Internal Medicine |
| Telehealth | Offers telehealth |
Medical group
- Scripps HealthLa Jolla, CA · 1,433 clinicians
Industry payments (Open Payments)
- 2025$1,129 · 39 payments from 11 companies
- 2024$668.51 · 24 payments from 9 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Genzyme Corporation | $356.48 | 10 |
| Glaxosmithkline, LLC. | $217.24 | 10 |
| Regeneron Healthcare Solutions, Inc. | $121.62 | 5 |
| Genentech, Inc. | $92.90 | 1 |
| Regeneron Pharmaceuticals, Inc. | $81.02 | 1 |
What the 2025 payments were for
- Food and Beverage$1,129 · 39 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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