Zachary Callahan, M.D.
NPI 1679969067ActiveIndividual· Surgery· Nashville, TN
Surgery (M.D.) in Nashville, Tennessee, trained at University of Cincinnati College of Medicine (class of 2015). 120 Medicare patients in 2024, $46,140 paid; nearly all of their 82 Part D prescriptions were generic (98%). Intuitive Surgical, Inc. was the largest of 7 companies reporting payments in 2025, $5,551 in all, mostly education.
Overview
| NPI | 1679969067 |
|---|---|
| Status | Active |
| Entity type | Individual |
| Credential | M.D. |
| Sole proprietor | No |
| NPI issued | Apr 13, 2015 |
| Last updated in NPPES | Jan 5, 2026 |
| Certified by provider | Jan 5, 2026 |
Specialties and licenses
| Taxonomy | Code | License | State |
|---|---|---|---|
| Surgery Primary | 208600000X | 66510 | TN |
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 - General Surgery (TN) |
|---|---|
| Accepts assignment | Yes (participating) |
Medicare services in 2024
| Medicare patients | 120 |
|---|---|
| Services billed | 221 across 44 procedure codes |
| Paid by Medicare | $46,140 |
Part D prescriptions in 2024
| Prescriptions (claims) | 82 · 103 30-day fills |
|---|---|
| Patients | 28 |
| Total drug cost | $918.93 |
| Generic share | 98% of claims |
Education and affiliations
| Medical school | University of Cincinnati College of Medicine |
|---|---|
| Graduation year | 2015 |
| Medicare specialty | General Surgery |
| Telehealth | Offers telehealth |
Medical group
- Tennessee Oncology PLLCNashville, TN · 358 clinicians
Hospital affiliations
- Ascension Saint Thomas HospitalNashville, TN
- Tristar Centennial Medical CenterNashville, TN
Industry payments (Open Payments)
- 2025$5,551 · 20 payments from 7 companies
- 2024$7,829 · 40 payments from 8 companies
Top paying companies in 2025
| Company | Amount | Payments |
|---|---|---|
| Intuitive Surgical, Inc. | $5,020 | 11 |
| W. L. Gore & Associates, Inc. | $355.86 | 4 |
| Enterra Medical, Inc. | $76.57 | 1 |
| Boston Scientific Corporation | $44.60 | 1 |
| Pacira Pharmaceuticals Incorporated | $18.52 | 1 |
What the 2025 payments were for
- Education$4,000 · 3 payments
- Travel and Lodging$869.02 · 7 payments
- Food and Beverage$682.33 · 10 payments
Receiving payments does not imply wrongdoing. What Open Payments covers ·original records
Other general surgeons in Nashville
- 1003101684
- 1003278060
- 1043607815
- 1073733093
- 1083858542
- 1104168574
- 1114193521
- 1154615045
- 1154647899
- 1174593271
- 1174889653
- 1215356993
All 142 general surgeons in Nashville · All general surgeons in Tennessee