Doctor profile · Federal record
Dr. Gwen Callahan, PA C
Physician Assistant · Physician Assistant · Medical Physician Assistant · Warrenton, VA
- NPI 1487836961
- 19 yrs on file
- Licensed in 3 states
- Female
- Solo practice
- No sanctions
Practice & contact
Operates at 3 locations .
- Primary practice
-
500 Hospital Dr
Warrenton, VA 201863027
(540) 316-5000 - Additional location
-
50505 Schoenherr RD, Suite 290
Shelby Twp, MI 483153140
(586) 314-0054
fax (586) 731-6275 - Additional location
-
11116 Medical Campus RD
Hagerstown, MD 217426710
(301) 790-8804 - Mailing address
-
50505 Schoenherr RD, Suite 290
Shelby Twp, MI 483153140
Credentials & registration
- NPI registered
- November 2007 — 19 yrs on file
- Profile last updated
- January 9, 2023
- Specialty taxonomy
- 363A00000X — NUCC code
- State licenses (3)
- Virginia #0110006327 · Maryland #C07550 · Michigan #5601005001
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1487836961. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
388
Distinct HCPCS
3
Medicare allowed
$30,438
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99232 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes | 254 | 150 | $68 | |
99239 |
Hospital discharge day management, more than 30 minutes | 97 | 96 | $97 | |
99233 |
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes | 37 | 33 | $102 |
In context: peer comparison
Among 6 peers in this city , average services per provider: 82. This provider delivers 4.7× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
65
Patients
40
Total drug cost
$304
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 24 | 23 | $50 |
| Cefuroxime (Cefuroxime Axetil) | Brand | 17 | 17 | $118 |
| Tamsulosin Hcl | Generic | 13 | 0 | $94 |
| Metoprolol Tartrate | Generic | 11 | 0 | $42 |
Frequently asked questions
What is Dr. Gwen Callahan's medical specialty?
Dr. Gwen Callahan practices Physician Assistant in Warrenton, VA.
Where does Dr. Gwen Callahan practice?
Dr. Gwen Callahan practices at 500 Hospital Dr, Warrenton, VA 201863027. Office phone: 5403165000.
What is Dr. Gwen Callahan's NPI?
Dr. Gwen Callahan's National Provider Identifier (NPI) is 1487836961, issued by NPPES.
What procedures does Dr. Gwen Callahan commonly perform?
Top Medicare-reported procedures in 2023: Subsequent hospital care with moderate levelof medical decision making (HCPCS 99232); Hospital discharge day management (HCPCS 99239); Subsequent hospital care with moderate levelof medical decision making (HCPCS 99233). Source: CMS Medicare Physician & Other Practitioners file.