William Walkup, MD
Psychiatry · Columbia, SCNPI 1386619948
Payments from drug & device makers
Across 96 payments — averaging $14.45 each. Meals, travel, consulting and speaking fees, gifts and royalties reported by drug and device makers.
- Johnson & Johnson$453
- AbbVie$245
- Otsuka America Pharmaceutical, Inc.$165
- Teva Pharmaceuticals USA, Inc.$147
- Sunovion Pharmaceuticals Inc.$65
- Vanda Pharmaceuticals Inc.$56
- plus $257 from 8 others
What the payments were for
- Food & beverage$1,29994%
- Education$886%
Most of this is food and beverage — typically meals provided during product presentations at a clinic or hospital. Nationally that is the single largest category of reported payments by count.
General payments by program year
Who reported the general payments
Companies are grouped under their corporate parent — a single manufacturer often files under several CMS reporting entities. Research and ownership payments are counted separately and are not in this table.
| Company | Payments | Total |
|---|---|---|
| Johnson & Johnson | 28 | $453 |
| AbbVie(2 entities) | 26 | $245 |
| Otsuka America Pharmaceutical, Inc. | 11 | $165 |
| Teva Pharmaceuticals USA, Inc. | 8 | $147 |
| Sunovion Pharmaceuticals Inc. | 4 | $65 |
| Vanda Pharmaceuticals Inc. | 3 | $56 |
| Indivior Inc. | 4 | $51 |
| ITI, Inc. (d/b/a Intra-cellular Therapies, Inc.) | 3 | $51 |
| Alkermes, Inc. | 2 | $35 |
| Bausch Health US, LLC | 1 | $31 |
| Takeda Pharmaceuticals U.S.A., Inc. | 2 | $28 |
| Neurocrine Biosciences, Inc. | 2 | $27 |
| Lundbeck LLC | 1 | $19 |
| Merck | 1 | $16 |
How this compares
$1,387 in reported general payments places this provider in the 70th percentile of 624 psychiatry providers in South Carolina.
Medicare billing
What this is not: this is the amount Original Medicare Part B allowed for services this provider billed in 2024. It is not their income. It excludes Medicare Advantage — now more than half of all Medicare enrollment — along with Medicaid and all commercial insurance, and it is gross practice revenue before staff, rent, supplies and malpractice premiums. CMS also suppresses any figure covering ten or fewer patients, so low-volume providers appear smaller than they are.
Most prescribed under Part D
| Drug | Claims | Cost to plans & patients |
|---|---|---|
| Aripiprazole | 98 | $4,781 |
| Desvenlafaxine Succinate ErDesvenlafaxine Succinate | 62 | $4,166 |
| Bupropion XlBupropion Hcl | 207 | $3,583 |
| Dextroamphetamine-AmphetamineDextroamphetamine/Amphetamine | 108 | $2,661 |
| Venlafaxine Hcl ErVenlafaxine Hcl | 178 | $2,553 |
| Trazodone Hcl | 215 | $2,520 |
| Alprazolam | 199 | $1,806 |
| Quetiapine Fumarate | 125 | $1,671 |
| Clonazepam | 166 | $1,605 |
| Divalproex Sodium ErDivalproex Sodium | 20 | $1,509 |
| Bupropion Hcl SrBupropion Hcl | 19 | $1,371 |
| Mirtazapine | 99 | $1,356 |
| Lamotrigine | 141 | $1,295 |
| Lorazepam | 155 | $1,165 |
| Hydroxyzine Hcl | 24 | $1,123 |
Paid to pharmacies, not to this prescriber.
Other psychiatry in Columbia
- Meera NarasimhanColumbia$146K
- Gariane GunterColumbia$46K
- Deborah LeveretteColumbia$11K
- Nioaka CampbellColumbia$11K
- Timothy MaloneColumbia$7K
- Kelly DionColumbia$7K
- Jacobo MintzerCharleston$4.9M
- Paul RobbinsSummerville$1.2M
- Brittany AlbrightMount Pleasant$691K
- Eduardo CifuentesCharleston$675K
Where these figures come from
- Payments: CMS Open Payments, program years 2019–2025 (publication P06302026_06032026).
- Billing: Medicare Physician & Other Practitioners, data year 2024. Original Medicare Part B only.
- Identity: NPPES NPI Registry, July 2026.