William A. Greisner, MD
NPI 1720095334ActiveIndividual· Allergy & Immunology· Lexington, KY
Allergy & Immunology (MD) in Lexington, Kentucky, trained at Eastern Virginia Medical School (class of 1991). Their prescriptions cost Medicare Part D more than their services did: $751,020 for 1,339 claims, against $52,676 paid for services in 2024. Lilly USA, LLC was the largest of 24 companies reporting payments in 2025, $14,404 in all, mostly consulting fees.
Overview
| NPI | 1720095334 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 3, 2006 |
| Last updated in NPPES | Jul 8, 2007 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Allergy & Immunology Primary | 207K00000X | 32610 | KY |
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 (KY) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 183 |
|---|---|
| Services billed | 5,357 across 26 procedure codes |
| Paid by Medicare | $52,676 |
Part D prescriptions in 2024
| Prescriptions (claims) | 1,339 · 2,069 30-day fills |
|---|---|
| Patients | 252 |
| Total drug cost | $751,020 |
| Generic share | 61% of claims |
Education and affiliations
| Medical school | Eastern Virginia Medical School |
|---|---|
| Graduation year | 1991 |
| Medicare specialty | Allergy/Immunology |
Medical group
- Allergy and Asthma Associates, P. S. CLexington, KY · 2 clinicians
Hospital affiliation
- Saint Joseph EastLexington, KY
Industry payments (Open Payments)
- 2025$14,404 · 153 payments from 24 companies
- 2024$8,001 · 117 payments from 19 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Lilly USA, LLC | $5,383 | 9 |
| Kaleo, Inc. | $3,136 | 5 |
| Genentech USA, Inc. | $2,040 | 9 |
| Genzyme Corporation | $1,017 | 26 |
| Csl Behring | $509.75 | 23 |
What the 2025 payments were for
- Consulting Fee$8,849 · 7 payments
- Food and Beverage$4,195 · 141 payments
- Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$1,000 · 1 payment
- Travel and Lodging$360.20 · 4 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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