DR. JAMES IRWIN EWING M.D.
NPI 1689837601
Internal Medicine - Medical Oncology in Glendale, AZ
About Dr. James Irwin Ewing M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. JAMES IRWIN EWING M.D. (NPI 1689837601) is an individual medical oncology provider in Glendale, Arizona, licensed in Arizona (47444) and active in the NPI registry since July 2008. He is enrolled in Medicare PECOS and is a graduate of Other (2008).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. James Irwin Ewing M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignment
Medicare enrollment records show James Ewing reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Chandler, AZ 85224
- Reassigned Medicare billing, Arizona enrollment
- 148 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 35
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 85306 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Reported Quality Measures
Referred Medical Equipment & Supplies CMS DME claims 3
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
Other Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
GLENDALE, AZ 85306
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is James Ewing's NPI number?
The NPI number for James Ewing is 1689837601. It was assigned to this individual provider in the NPPES registry on July 9, 2008.
Where is James Ewing located?
James Ewing practices at 5810 W Beverly Ln, Glendale, AZ 85306. The listed phone number is (623) 312-3000.
What is James Ewing's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.
Is James Ewing enrolled in Medicare?
Yes. James Ewing is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organization bills Medicare for James Ewing's services?
According to the CMS Revalidation Reassignment List (October 2026 release), James Ewing reassigns Medicare benefits to Ironwood Physicians, PC (Chandler, AZ). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for James Ewing's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does James Ewing accept?
Health plans from Ambetter Health, Ambetter from Arizona Complete Health, Blue Cross Blue Shield of Arizona, Cigna HealthCare of Arizona, Inc and Imperial Insurance Companies, Inc. and 2 other insurers list James Ewing as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
When was this NPI record last updated?
The NPPES record for James Ewing was last updated on November 17, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 years ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.