Quick answers
- Which hospitals does Gretchen B. Alexander work at?
- Medicare's official clinician data lists Gretchen B. Alexander at 1 hospital: Valleywise Health Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Gretchen B. Alexander see patients?
- Medicare's clinician data lists 1 practice location in Mesa, AZ. Call before your visit to confirm the address.
- What is Gretchen B. Alexander's specialty?
- Medicare lists Psychiatry as the primary specialty, and also Addiction Medicine.
- Does Gretchen B. Alexander accept Medicare assignment?
- Yes. Medicare's clinician data says Gretchen B. Alexander 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 Gretchen B. Alexander?
- (480) 344-2000, as listed in official Medicare / NPI Registry data.
- What is Gretchen B. Alexander's NPI number?
- 1851579783. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Gretchen B. Alexander works
Medicare's Facility Affiliation Data lists Gretchen B. Alexander at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Valleywise Health Medical CenterPhoenix, AZ · Acute Care Hospital · CCN 030022
Practice locations
Addresses where Gretchen B. Alexander is enrolled with Medicare (CMS data updated 2026-10-02).
- 570 W Brown RdMesa, AZ 85201 (480) 344‑2000
Group practices
Medicare enrollment lists Gretchen B. Alexander as a member of this group (CMS data updated 2026-10-02).
- District Medical Group Inc458 clinicians in the group
Specialties
- Psychiatryprimary
- Addiction Medicinealso
Other psychiatrists in Mesa
Clinicians with the same Medicare primary specialty in Mesa, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Perelman School Of Med At The University Of Pennsylvania |
| Graduation year | 1987 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1851579783 |
| 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