William G. Harris, MD
NPI 1922065788ActiveIndividual· Allergy & Immunology· Orange, CA
Allergy & Immunology (MD) with Allergy Partners of California Inc, practicing in Orange, California. Their prescriptions cost Medicare Part D more than their services did: $580,517 for 1,151 claims, against $57,497 paid for services in 2024. Leo Pharma Inc. was the largest of 19 companies reporting payments in 2025, $1,525 in all, mostly food and beverage.
Overview
| NPI | 1922065788 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Apr 27, 2006 |
| Last updated in NPPES | Dec 14, 2023 |
| Certified by provider | Dec 14, 2023 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | G64493 | 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 10, 2026 | No match | — |
| New York OMIG · Nov 10, 2026 | No match | — |
| Ohio Medicaid · Nov 10, 2026 | No match | — |
| Pennsylvania Medicheck · Nov 10, 2026 | No match | — |
| Washington HCA · Nov 10, 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 | 86 |
|---|---|
| Services billed | 3,467 across 17 procedure codes |
| Paid by Medicare | $57,497 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,151 · 2,025 30-day fills |
|---|---|
| Patients | 205 |
| Total drug cost | $580,517 |
| Generic share | 76% of claims |
Education and affiliations
| Graduation year | 1987 |
|---|---|
| Medicare specialty | Allergy/Immunology |
Medical group
- Allergy Partners of California IncPismo Beach, CA · 12 clinicians
Industry payments (Open Payments)
- 2025$1,525 · 70 payments from 19 companies
- 2024$2,247 · 102 payments from 18 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Leo Pharma Inc. | $286.41 | 9 |
| Glaxosmithkline, LLC. | $211.61 | 10 |
| Genzyme Corporation | $160.30 | 13 |
| Pfizer Inc. | $146.50 | 8 |
| Novartis Pharmaceuticals Corporation | $135.61 | 6 |
What the 2025 payments were for
- Food and Beverage$1,491 · 69 payments
- Education$34.00 · 1 payment
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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