Doctor profile · Federal record
Dr. Zachary Callahan, M.D.
Surgery Physician (CMS: General Surgery) · Nashville, TN
- NPI 1679969067
- Accepts Medicare
- 11 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
410 42Nd Ave N Ste 400
Nashville, TN 372093658
(615) 329-7887
fax (615) 340-4537
Credentials & registration
- NPI registered
- April 2015 — 11 yrs on file
- Profile last updated
- January 5, 2026
- Year of graduation
- 2015 — 11 yrs since
- Specialty taxonomy
- 208600000X — NUCC code
- State license (1)
- Tennessee #66510
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1679969067. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
100
Distinct HCPCS
4
Medicare allowed
$12,285
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99223 |
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes | 43 | 42 | $160 | |
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 26 | 18 | $74 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 18 | 16 | $107 | |
99222 |
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes | 13 | 13 | $121 |
In context: peer comparison
Among 37 peers in Nashville Surgery Physician, average services per provider: 37. This provider delivers 2.7× the peer median.Open Payments
Industry payments received
All-time total
$7,349
Transactions
29
Manufacturers
8
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Intuitive Surgical, INC. | 20 | $6,752.95 | |
| W. L. Gore & Associates, INC. | 2 | $236.81 | |
| Ethicon US, LLC | 1 | $142.50 | |
| Stryker Corporation | 1 | $68.45 | |
| Baxter Healthcare | 1 | $54.05 | |
| Enterra Medical, INC. | 1 | $44.97 | |
| Medtronic, INC. | 2 | $35.15 | |
| Conmed Corporation | 1 | $13.83 |
By nature of payment
Hospital affiliations
Frequently asked questions
What is Dr. Zachary Callahan's medical specialty?
Dr. Zachary Callahan practices Surgery Physician in Nashville, TN.
Where does Dr. Zachary Callahan practice?
Dr. Zachary Callahan practices at 410 42Nd Ave N Ste 400, Nashville, TN 372093658. Office phone: 6153297887.
What is Dr. Zachary Callahan's NPI?
Dr. Zachary Callahan's National Provider Identifier (NPI) is 1679969067, issued by NPPES.
Does Dr. Zachary Callahan accept Medicare assignment?
Yes. Dr. Zachary Callahan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Zachary Callahan commonly perform?
Top Medicare-reported procedures in 2023: Initial hospital care with moderate level of medical decision making (HCPCS 99223); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.