Quick answers
- Which hospitals does Gregory Brennan work at?
- Medicare's official clinician data lists Gregory Brennan at 1 hospital: Texas Health Hospital Mansfield. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gregory Brennan see patients?
- Medicare's clinician data lists 1 practice location in Southlake, TX. Call before your visit to confirm the address.
- What is Gregory Brennan's specialty?
- Medicare lists Gastroenterology as the primary specialty.
- Does Gregory Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says Gregory Brennan accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Gregory Brennan?
- (817) 424-1525, as listed in official Medicare / NPI Registry data.
- What is Gregory Brennan's NPI number?
- 1689017105. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gregory Brennan works
Medicare's Facility Affiliation Data lists Gregory Brennan at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Texas Health Hospital MansfieldMansfield, TX · Acute Care Hospital · CCN 670309
Practice locations
Addresses where Gregory Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 505 S Nolen Dr, ASouthlake, TX 76092 (817) 424‑1525
Group practices
Medicare enrollment lists Gregory Brennan as a member of this group (CMS data updated 2026-10-02).
- Texas Digestive Disease Consultants, PLLC608 clinicians in the group
Specialties
- Gastroenterologyprimary
Other gastroenterologists in Southlake
Clinicians with the same Medicare primary specialty in Southlake, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Tufts University School Of Medicine |
| Graduation year | 2013 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1689017105 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians