Dr. John B. Mack, MD
General Surgery (Surgery Physician)
- Medicare participating
At a glance
- Medical school
- Baylor College of Medicine (1987)
- Years since graduation
- 39
- In the NPI registry since
- 2006
- Medicare patients seen, 2024
- 355
Licensed in Texas since 1989, according to the Texas Medical Board. We show license dates only for the states that publish them in bulk; see which states do. For other states, check the state medical board.
The NPI date is when this clinician registered for a National Provider Identifier, the billing number used on health claims. It is not a license, graduation or board-certification date. NPIs were first issued in May 2005 and became required on claims in 2007–2008, so an early date usually means the clinician was already in practice before then. What an NPI is
Education and training
- 1987Medical school: Baylor College of Medicine
- 2006Registered with an NPI (national billing number; not a license date) — NPIs began in 2005, so practice likely started earlier
Undergraduate school, residency, fellowship, licensing exams and board certification aren’t in public federal data. Board certification can be confirmed with the certifying board (ABMS member boards for MDs, AOA boards for DOs).
Specialties and state licenses
-
Surgery Physician primary
TX license H6396 (first issued 1989; active)
As reported to the NPI registry. To confirm a license is current, check the state medical board.
Where they work
Hospitals
- Christus Good Shepherd Medical Center Longview, TX
- Longview Regional Medical Center Longview, TX
Medical groups
- Associated Clinicians of East Texas (108 clinicians)
Hospitals this clinician lists with Medicare, and groups they bill Medicare through (Care Compare). Affiliation doesn’t mean they see patients at every location.
Medicare patients and services
- Medicare patients, 2024
- 355
- Services billed
- 831
- Patients’ average age
- 73
| Service | Times | Patients |
|---|---|---|
| New patient office or other outpatient visit, 45-59 minutes | 189 | 189 |
| Established patient office or other outpatient visit, 20-29 minutes | 181 | 142 |
| Established patient office or other outpatient visit, 30-39 minutes | 51 | 49 |
| Partial removal of breast | 44 | 38 |
| Removal of gallbladder with x-ray study of bile ducts using an endoscope | 35 | 35 |
| Biopsy or removal of deep lymph nodes of underarm | 31 | 31 |
| Imaging of lymph nodes during surgery | 31 | 31 |
| Chronic care management services, first 20 minutes of clinical staff time directed by health care professional, per calendar month | 30 | 17 |
| Diagnostic digital breast tomosynthesis, unilateral or bilateral (list separately in addition to 77065 or 77066) | 29 | 27 |
| Repair of groin hernia (5 years or older) | 22 | 22 |
Medicare fee-for-service only. CMS leaves out services billed for fewer than 11 patients. These figures describe a practice’s Medicare work; they aren’t a measure of quality.
Medicare prescriptions
| Drug | Prescriptions |
|---|---|
| Ondansetron Hcl Other prescribers in Longview, TX | 223 |
| Tramadol Hcl Other prescribers in Longview, TX | 217 |
| Clindamycin Hcl Other prescribers in Longview, TX | 11 |
Prescriptions filled under Medicare Part D, including refills. CMS leaves out drugs prescribed fewer than 11 times.
Payments from drug and device companies
In 2025, 5 companies reported 10 payments worth $213 in total to this clinician.
| Vertex Pharmaceuticals Incorporated | $72.98 |
|---|---|
| Medtronic, Inc. | $71.93 |
| Solventum Corporation | $28.98 |
| Hologic Sales and Service, LLC | $19.87 |
| Elucent Medical | $19.43 |
| Food and Beverage | $213 |
|---|
From CMS Open Payments. A payment is not evidence of wrongdoing; many are for consulting, teaching or meals. Clinicians can review and dispute their records with CMS.