Quick answers
- Where does Gillian M. Brennan see patients?
- Medicare's clinician data lists 1 practice location in Tamuning, GU. Call before your visit to confirm the address.
- What is Gillian M. Brennan's specialty?
- Medicare lists Undefined Physician Type (Specify) as the primary specialty.
- Does Gillian M. Brennan accept Medicare assignment?
- Medicare's clinician data says Gillian M. Brennan may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is Gillian M. Brennan's NPI number?
- 1174782437. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Gillian M. Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 850 Gov Carlos G Camacho RdTamuning, GU 96913
Specialties
Find other Undefined Physician Type (Specify) doctors in Guam →
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2004 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1174782437 |
| 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
- 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