Nancy B. Mozelsio, M.D.
NPI 1114910551ActiveIndividual· Allergy & Immunology· Walnut Creek, CA
Allergy & Immunology (M.D.) in Walnut Creek, California, trained at University of California, Irvine, California College of Medicine (class of 1996). In 2024 Medicare paid $320,420 for 221 patients, and Part D covered 711 of their prescriptions, 68% of them generic. Amgen Inc. was the largest of 11 companies reporting payments in 2025, $425.75 in all, mostly food and beverage.
Overview
| NPI | 1114910551 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Aug 30, 2005 |
| Last updated in NPPES | Oct 2, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | A75031 | 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 | 221 |
|---|---|
| Services billed | 13,601 across 30 procedure codes |
| Paid by Medicare | $320,420 |
Part D prescriptions in 2024
| Prescriptions (claims) | 711 · 1,405 30-day fills |
|---|---|
| Patients | 182 |
| Total drug cost | $299,993 |
| Generic share | 68% of claims |
Education and affiliations
| Medical school | University of California, Irvine, California College of Medicine |
|---|---|
| Graduation year | 1996 |
| Medicare specialty | Allergy/Immunology |
| Secondary specialties | Internal Medicine |
Medical group
- Allergy and Asthma Medical Group of the Bay Area IncBrentwood, CA · 20 clinicians
Hospital affiliation
- John Muir Medical Center - Walnut Creek CampusWalnut Creek, CA
Industry payments (Open Payments)
- 2025$425.75 · 18 payments from 11 companies
- 2024$538.19 · 21 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Amgen Inc. | $73.35 | 4 |
| Ionis Pharmaceuticals, Inc. | $65.84 | 2 |
| Ars Pharmaceuticals Operations, Inc. | $59.57 | 2 |
| Astrazeneca Pharmaceuticals LP | $52.10 | 3 |
| Genzyme Corporation | $42.69 | 1 |
What the 2025 payments were for
- Food and Beverage$425.75 · 18 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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