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

Dr. Robert William Irwin, MD

Individual provider Internal Medicine Physician · NPI 1215948039

Dr. Robert William Irwin, MD is an Internal Medicine in Oro Valley, Arizona. Graduated from University of Missouri, Columbia School of Medicine in 1997, 29 years ago. Practices with Desert Sage Internal Medicine Ltd, a 2-clinician group and accepts Medicare assignment. Licensed in Arizona.

Years since qualifying
29
Trained at
University of Missouri, Columbia School of Medicine
Licensed in
AZ
In the registry since
2006
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

1834 E Innovation Park Dr
Oro Valley, AZ 85755-1963
Phone: (520) 825-9656
Fax: (520) 818-2525
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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 28417 (AZ)

Record details

NPI number1215948039
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedAugust 10, 2006
Last updated in NPPESNovember 8, 2010
Mailing address1834 E Innovation Park Dr, Oro Valley, AZ 85755-1963

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolUNIVERSITY OF MISSOURI, COLUMBIA SCHOOL OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice Desert Sage Internal Medicine Ltd — 2 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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