Quick answers
- Where does William M. Brennan see patients?
- Medicare's clinician data lists 1 practice location in Tucson, AZ. Call before your visit to confirm the address.
- What is William M. Brennan's specialty?
- Medicare lists Physician Assistant as the primary specialty.
- Does William M. Brennan accept Medicare assignment?
- Yes. Medicare's clinician data says William M. 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 William M. Brennan?
- (520) 618-1630, as listed in official Medicare / NPI Registry data.
- What is William M. Brennan's NPI number?
- 1336231869. 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 William M. Brennan is enrolled with Medicare (CMS data updated 2026-10-02).
- 1735 E Skyline DrTucson, AZ 85718 (520) 618‑1630
Group practices
Medicare enrollment lists William M. Brennan as a member of this group (CMS data updated 2026-10-02).
- Ironwood Dermatology PC10 clinicians in the group
Specialties
- Physician Assistantprimary
Other physician assistants in Tucson
Clinicians with the same Medicare primary specialty in Tucson, AZ — not a recommendation.
Clinician information
| Credential | PA |
|---|---|
| Graduation year | 1984 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1336231869 |
| 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