Quick answers
- Which hospitals does Jonathan S. Mellen work at?
- Medicare's official clinician data lists Jonathan S. Mellen at 3 hospitals: Flagstaff Medical Center, Mat-Su Regional Medical Center and Yuma Regional Medical Center. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Jonathan S. Mellen see patients?
- Medicare's clinician data lists 5 practice locations, including Flagstaff, AZ, Yuma, AZ and Wasilla, AK. Call before your visit to confirm the address.
- What is Jonathan S. Mellen's specialty?
- Medicare lists Gastroenterology as the primary specialty, and also Internal Medicine.
- Does Jonathan S. Mellen accept Medicare assignment?
- Yes. Medicare's clinician data says Jonathan S. Mellen 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 Jonathan S. Mellen?
- (928) 779-3366, as listed in official Medicare / NPI Registry data.
- What is Jonathan S. Mellen's NPI number?
- 1609919471. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Jonathan S. Mellen works
Medicare's Facility Affiliation Data lists Jonathan S. Mellen at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Flagstaff Medical CenterFlagstaff, AZ · Acute Care Hospital · CCN 030023
- Mat-Su Regional Medical CenterPalmer, AK · Acute Care Hospital · CCN 020006
- Yuma Regional Medical CenterYuma, AZ · Acute Care Hospital · CCN 030013
Practice locations
Addresses where Jonathan S. Mellen is enrolled with Medicare (CMS data updated 2026-10-02).
- 1200 N Beaver StFlagstaff, AZ 86001 (928) 779‑3366
- 1200 N Beaver St, Attn. Managed Care ContractingFlagstaff, AZ 86001
- 1215 N Beaver St, Suite 203Flagstaff, AZ 86001 (928) 773‑2249
- 2400 S Ave AYuma, AZ 85364 (928) 344‑2000
- 3190 E Meridian Park Loop, Suite 206Wasilla, AK 99654 (907) 373‑2544
Group practices
Medicare enrollment lists Jonathan S. Mellen as a member of these groups (CMS data updated 2026-10-02).
- Northern Arizona Healthcare Corporation385 clinicians in the group
- Yuma Regional Medical Center361 clinicians in the group
- Alaska Gi Associates LLC6 clinicians in the group
Specialties
- Gastroenterologyprimary
- Internal Medicinealso
Other gastroenterologists in Flagstaff
Clinicians with the same Medicare primary specialty in Flagstaff, AZ — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2004 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1609919471 |
| 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