Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Dr. Michael Aaron Klein, MD

Individual provider Internal Medicine Physician · NPI 1366029092

Dr. Michael Aaron Klein, MD practises Internal Medicine in Mesa, Arizona. Qualified in 2021, 5 years ago. Practices with Banner Hospital Based Physicians Arizona LLC, a 641-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
5
Licensed in
AZ
In the registry since
2021
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

6644 E Baywood Ave
Mesa, AZ 85206-1747
Phone: (480) 321-2000
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 73233 (AZ)

Record details

NPI number1366029092
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedMarch 27, 2021
Last updated in NPPESAugust 8, 2024
Certification dateAugust 8, 2024

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 2021 (5 years in practice)
Group practice Banner Hospital Based Physicians Arizona Llc — 641 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients80
Services billed 179 a service is one billed item, such as a visit, a test or a procedure
Average patient age77

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Banner Hospital Based Physicians Arizona LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 641 clinicians in the practice; 12 are shown here.

Other providers in Mesa