Alexander N. Greiner, M.D.
NPI 1609801299ActiveIndividual· Allergy & Immunology· San Diego, CA
Allergy & Immunology (M.D.) in San Diego, California, trained at State University of Ny Upstate Medical University (class of 1998). Their prescriptions cost Medicare Part D more than their services did: $290,233 for 360 claims, against $7,598 paid for services in 2024. Glaxosmithkline, LLC. was the largest of 12 companies reporting payments in 2025, $545.07 in all, mostly food and beverage.
Overview
| NPI | 1609801299 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Jul 11, 2006 |
| Last updated in NPPES | Mar 14, 2016 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | A77327 | CA |
| Internal Medicine | 207R00000X | A77327 | 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 | 42 |
|---|---|
| Services billed | 482 across 17 procedure codes |
| Paid by Medicare | $7,598 |
Part D prescriptions in 2024
| Prescriptions (claims) | 360 · 595 30-day fills |
|---|---|
| Patients | 57 |
| Total drug cost | $290,233 |
| Generic share | 48% of claims |
Education and affiliations
| Medical school | State University of Ny Upstate Medical University |
|---|---|
| Graduation year | 1998 |
| Medicare specialty | Allergy/Immunology |
| Telehealth | Offers telehealth |
Medical group
- Rady Children's Hospital San DiegoSan Diego, CA · 169 clinicians
Industry payments (Open Payments)
- 2025$545.07 · 23 payments from 12 companies
- 2024$41,383 · 36 payments from 17 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Glaxosmithkline, LLC. | $172.98 | 9 |
| Ars Pharmaceuticals Operations, Inc. | $77.32 | 3 |
| Ionis Pharmaceuticals, Inc. | $62.27 | 2 |
| Genzyme Corporation | $44.80 | 1 |
| Pharming Healthcare, Inc. | $28.66 | 1 |
What the 2025 payments were for
- Food and Beverage$545.07 · 23 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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