Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

William Lee Hasler, MD

Individual provider Internal Medicine Physician · NPI 1346322872

William Lee Hasler, MD is a Gastroenterology in Ann Arbor, Michigan. Qualified in 1983, 43 years ago. Practices with Mayo Clinic Arizona, a 1,616-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Arizona and Michigan.

Years since qualifying
43
Licensed in
AZ, MI
In the registry since
2006
Specialties on file
3
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

1500 E Medical Center Dr
Ann Arbor, MI 48109-5000
Phone: (734) 936-4000
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (1)

  • 13400 E Shea Blvd, Scottsdale, AZ 85259-5452 — (480) 301-8000

Specialties & licences

Gastroenterology Physician (primary) Taxonomy 207RG0100X · Licence 64800 (AZ)
Internal Medicine Physician Taxonomy 207R00000X · Licence 4301404025 (MI)
Gastroenterology Physician Taxonomy 207RG0100X · Licence 4301404025 (MI)

Record details

NPI number1346322872
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedOctober 20, 2006
Last updated in NPPESOctober 18, 2021
Certification dateOctober 18, 2021

Medicare enrollment

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

Medicare specialtyGASTROENTEROLOGY
Medical schoolOTHER
Graduated 1983 (43 years in practice)
Group practice Mayo Clinic Arizona — 1616 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations5 on file with Medicare

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