Katharine Sue Nelson, MD
NPI 1497921811ActiveIndividual· Allergy & Immunology· San Jose, CA
Allergy & Immunology (MD) in San Jose, California, trained at University of Wisconsin School of Medicine (class of 2005). Their prescriptions cost Medicare Part D more than their services did: $99,230 for 260 claims, against $54,113 paid for services in 2024. Astrazeneca Pharmaceuticals LP was the largest of 17 companies reporting payments in 2025, $3,760 in all, mostly food and beverage.
Overview
| NPI | 1497921811 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | May 6, 2008 |
| Last updated in NPPES | Jun 19, 2012 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | A108809 | 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 | 107 |
|---|---|
| Services billed | 4,078 across 17 procedure codes |
| Paid by Medicare | $54,113 |
Part D prescriptions in 2024
| Prescriptions (claims) | 260 · 391 30-day fills |
|---|---|
| Patients | 57 |
| Total drug cost | $99,230 |
| Generic share | 64% of claims |
Education and affiliations
| Medical school | University of Wisconsin School of Medicine |
|---|---|
| Graduation year | 2005 |
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Internal Medicine |
Medical group
- South Bay Allergy and Asthma Group IncSan Jose, CA · 4 clinicians
Industry payments (Open Payments)
- 2025$3,760 · 166 payments from 17 companies
- 2024$2,171 · 103 payments from 15 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Astrazeneca Pharmaceuticals LP | $887.42 | 53 |
| Glaxosmithkline, LLC. | $804.42 | 34 |
| Ars Pharmaceuticals Operations, Inc. | $529.04 | 16 |
| Genzyme Corporation | $308.92 | 11 |
| Amgen Inc. | $184.42 | 9 |
What the 2025 payments were for
- Food and Beverage$3,726 · 165 payments
- Education$34.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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