Zachary A. Hammons, MD
NPI 1073779799ActiveIndividual· Psychiatry & Neurology, Psychiatry· Johnson City, TN
Psychiatry & Neurology, Psychiatry (MD) in Johnson City, Tennessee, trained at East Tennessee State University Quillen College of Medicine (class of 2012). Part D covered 1,277 prescriptions written in 2024, 87% of them generic. Vanda Pharmaceuticals Inc. was the largest of 8 companies reporting payments in 2025, $1,447 in all, mostly food and beverage.
Overview
| NPI | 1073779799 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | MD |
| Sole proprietor | No |
| NPI issued | Aug 1, 2008 |
| Last updated in NPPES | Sep 17, 2025 |
| Certified by provider | Sep 17, 2025 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Psychiatry & Neurology, Psychiatry Primary | 2084P0800X | 45653 | TN |
| Psychiatry & Neurology, Psychiatry | 2084P0800X | 0101246145 | VA |
| Preventive Medicine, Addiction Medicine | 2083A0300X | 45653 | TN |
| Preventive Medicine, Addiction Medicine | 2083A0300X | 0101246145 | VA |
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 - Psychiatry (TN); Practitioner - Family Practice (VA) |
|---|
Part D prescriptions in 2024
| Prescriptions (claims) | 1,277 · 1,464 30-day fills |
|---|---|
| Patients | 53 |
| Total drug cost | $160,883 |
| Generic share | 87% of claims |
Education and affiliations
| Medical school | East Tennessee State University Quillen College of Medicine |
|---|---|
| Graduation year | 2012 |
| Medicare specialty | Psychiatry |
Medical group
- Catalyst Health Solutions,llcJohnson City, TN · 8 clinicians
Industry payments (Open Payments)
- 2025$1,447 · 96 payments from 8 companies
- 2024$516.66 · 39 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Vanda Pharmaceuticals Inc. | $379.86 | 24 |
| Otsuka America Pharmaceutical, Inc. | $250.06 | 13 |
| Iti, Inc. (D/B/A Intra-Cellular Therapies, Inc.) | $244.47 | 15 |
| Abbvie Inc. | $194.47 | 22 |
| Braeburn Inc. | $160.99 | 12 |
What the 2025 payments were for
- Food and Beverage$1,447 · 96 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
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All 58 psychiatrists in Johnson City · All psychiatrists in Tennessee