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DR. STEPHEN ALEXANDER ASH MD
NPI 1437128279
General Practice in Glendale, AZ

Active since March 15, 2006PECOS EnrolledAccepts Medicare Assignment
5410 W THUNDERBIRD, STE 101, GLENDALE, AZ 85306(602) 530-6189(602) 548-2292 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Stephen Alexander Ash Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. STEPHEN ALEXANDER ASH MD (NPI 1437128279) is an individual general practice provider in Glendale, Arizona, licensed in Arizona (15494) and active in the NPI registry since March 2006. He is enrolled in Medicare PECOS and is a graduate of University Of Louisville School Of Medicine (1983).

NPPES Registry Identity

NPI1437128279
Entity TypeIndividualMale
Primary Taxonomy208D00000X
Provider Legal NameDR. STEPHEN ALEXANDER ASHCredential: MD
Location Address5410 W THUNDERBIRD, STE 101Glendale, AZ 85306-4711
Mailing Address5410 W Thunderbird Rd, Ste 101Glendale, AZ 85306-4711 · (602) 530-6189 · Fax (602) 548-2292
Phone(602) 530-6189
Fax(602) 548-2292
Sole ProprietorNo
Medical School CMSUniversity Of Louisville School Of MedicineGraduated 1983
Enumeration DateMarch 15, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1437128279 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyGeneral PracticeAllopathic & Osteopathic Physicians
Taxonomy Code208D00000X
License✔ Licensed in AZ · 15494
Definition
A physician who specializes in the general practice of diagnosing, treating, and managing patients with a variety of illnesses and conditions. Source: National Uniform Claim Committee
5410 W THUNDERBIRD, Glendale, AZ 85306
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Other Identifiers 1

Other15494AZ · Arizona Medical Board

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross Blue Shield of Arizona.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. Stephen Alexander Ash Md 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.

PECOS PAC ID143245282
PECOS Enrollment IDI20051007000753
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

2

Medicare enrollment records show Stephen Ash reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Nextcare Arizona I Jv LLC
19 mi
Urgent Care
914 N SCOTTSDALE RD STE 104
Tempe, AZ 85288
  • Reassigned Medicare billing, Arizona enrollment
  • 240 clinicians in this Medicare group
NPI 1114798071 (480) 924-8382
Nextcare Arizona LLC
19 mi
Urgent Care
914 N SCOTTSDALE RD STE 104
Tempe, AZ 85288
  • Reassigned Medicare billing, Arizona enrollment
  • 367 clinicians in this Medicare group
NPI 1043371826 (480) 924-8382

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 2

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
27 services27 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
15 services15 patients

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 Stephen Ash's NPI number?

The NPI number for Stephen Ash is 1437128279. It was assigned to this individual provider in the NPPES registry on March 15, 2006.

Where is Stephen Ash located?

Stephen Ash practices at 5410 W Thunderbird Ste 101, Glendale, AZ 85306. The listed phone number is (602) 530-6189.

What is Stephen Ash's specialty?

The primary specialty registered for this NPI is General Practice with taxonomy code 208D00000X.

Is Stephen Ash enrolled in Medicare?

Yes. Stephen Ash 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 organizations bill Medicare for Stephen Ash's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Stephen Ash reassigns Medicare benefits to 2 organizations: Nextcare Arizona I Jv LLC (Tempe, AZ) and Nextcare Arizona LLC (Tempe, AZ). Each 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 Stephen Ash's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Stephen Ash accept?

Health plans from Blue Cross Blue Shield of Arizona list Stephen Ash 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 Stephen Ash was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.