Jonathan Spencer Mellen, M.D.
Gastroenterology · Internal Medicine (CMS) · Phoenix, AZ
At a glance
9305 W Thomas Rd, Phoenix, AZ 85037-3375
Published activity: Colonoscopy · Upper gastrointestinal (GI) endoscopy for acid reflux. View counts and coverage
NPPES record updated Jun 11, 2026. Public records can lag behind changes at a practice.
Before you call: a quick checklist
- Are you accepting new patients?
- Do you accept my specific insurance plan?
- Do you provide the service I need at this address?
- Do I need a referral, and what is the earliest appointment?
Insurance participation and appointment availability are not established by these public records.
Medicare & insurance
Insurance participation is not established by these public records. Ask the practice and your insurer about your specific plan and this location.
How to check your coverage
Use your plan’s provider directory or the member-services number on your insurance card. Confirm the clinician, practice address, service, and whether a referral is required. A missing opt-out record does not establish Medicare acceptance.
Check the official Medicare directory ↗Practice location
9305 W Thomas Rd Ste 478Phoenix, AZ 85037-3375
Additional reported practice locations
2490 S Woodworth Loop Ste 200Palmer, AK 996457410
Phone: 9078616315
Fax: 9078616533 1200 N Beaver St
Flagstaff, AZ 860013118
Phone: 9287732332 2400 S Avenue A
Yuma, AZ 853647170
Phone: 9283363213
Education & affiliations
- Medical / professional school
- Not reported in this file
- Graduation year
- 2004
- CMS specialties
- Gastroenterology · Internal Medicine
Practice groups
Reported hospital affiliations
- Flagstaff Medical Center Flagstaff, AZ
- Mat-Su Regional Medical Center Palmer, AK
- Yuma Regional Medical Center Yuma, AZ
Graduation year does not establish years in practice. A reported affiliation does not establish employment, current admitting privileges, or insurance participation.
Source: CMS National Downloadable File · Published Oct 15, 2026.
Source: CMS Facility Affiliation Data · Published Oct 15, 2026.
Procedures in the public data
Reported activity can help you ask more informed questions about a practice’s services.
| Procedure category | Published Medicare activity |
|---|---|
| Colonoscopy | 184 |
| Upper gastrointestinal (GI) endoscopy for acid reflux | 290 |
CMS uses a one-year claims window with a reporting lag. Counts cover the Medicare activity included by CMS, not all patients. “1–10” is a published range. Volume is not a quality or outcomes score. Coverage and methodology
Source: CMS Utilization Data · Published Oct 15, 2026.
Find providers with a similar service mix
Compare 2024 published Medicare activity in the same reported specialty, here or in another city.
Industry-reported general payments
Includes reported transfers of value, such as meals, travel, or consulting. Payments do not establish improper conduct or quality of care. Research funding and ownership values are excluded from this total.
See payment purposes and reporting companies
Reported purposes
| Purpose | Amount |
|---|---|
| Food and beverage | $73.59 |
Reporting companies
| Company | Amount |
|---|---|
| LILLY USA, LLC | $31.84 |
| ABBVIE INC. | $21.12 |
| MADRIGAL PHARMACEUTICALS | $20.63 |
Source: CMS 2025 payments grouped by covered recipient and nature of payments · Published Jun 30, 2026.
Professional details: NPI, taxonomy & registry record
Registry details
- Primary taxonomy
- Gastroenterology · Internal Medicine (CMS)
- Taxonomy code
- 207RG0100X
- Enumeration date
- Feb 14, 2007
- Record updated
- Jun 11, 2026
More registry details
- Provider type
- Individual · Type 1
- Reported credentials
- M.D.
Reported taxonomies and licenses
207RG0100X · Primary
License reported: 44619 AZ
207RG0100X
License reported: 210986 AK
License numbers and credentials are reported to NPPES; HCPList does not independently verify them.
Practice location
9305 W Thomas RdSte 478
Phoenix, AZ 85037-3375
- Phone
- (623) 236-8507
- Fax
- (623) 236-8508
Mailing address
9305 W THOMAS RDSTE 478
PHOENIX, AZ 850373375
Information may be outdated or incomplete. Confirm details directly with the practice. HCPList is an independent directory and is not affiliated with CMS.
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