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

Dr. Robert William Irwin, MD

Individual provider Internal Medicine Physician · NPI 1215948039

Dr. Robert William Irwin, MD practises 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 Not confirmed with CMS for 15 years — call before visiting
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

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

Procedures

From CMS Care Compare, which counts the procedures a clinician billed to Original Medicare and Medicare Advantage over a recent 12-month period. CMS reports a fixed list of common procedures, so this is not everything the clinician does. Counts of 10 or fewer are given as a range, because CMS withholds small numbers.

Removal of skin lesions 1–10 times

The percentile compares how often this clinician performed the procedure with other clinicians who performed it, as CMS calculates it. It measures volume, not outcomes or skill.

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 patients205
Services billed 856 a service is one billed item, such as a visit, a test or a procedure
Average patient age80

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. Those with a page here are linked.

Colleagues at Desert Sage Internal Medicine Ltd

Clinicians the CMS Doctors & Clinicians file lists under the same group practice.

Other providers in Oro Valley