Robert William Irwin, MD
Internal Medicine Physician · Oro Valley, AZ
Robert William Irwin, MD is an internal medicine physician with a practice address in Oro Valley, Arizona, and NPI 1215948039, issued on Aug 10, 2006. Check the license (Arizona 28417, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert William Irwin
- Credential
- MD
- Primary taxonomy
- Internal Medicine Physician 207R00000X
- License number
- 28417 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 1834 E Innovation Park Dr, Oro Valley, AZ 85755
- Phone
- (520) 825-9656
- Enumerated
- Aug 10, 2006
- Record last updated
- Nov 8, 2010 (not updated in 16 years: call before relying on the address or phone)
- Fax
- (520) 818-2525
- Medicare enrollment
- Enrolled (PECOS I20100127000666); accepts Medicare assignment
- Medical or professional school
- University Of Missouri, Columbia School Of Medicine, 1997
- Entity
- Type 1 · individual
8 nearest internal medicine physician records → All 2,853 in Arizona → Look up another NPI →
Also registered at 1834 E Innovation Park Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Pamela Dowell, MDInternal Medicine Physician1326059239
Verify Robert William Irwin in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 28417Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
10% more Medicare Part D claims than the average internal medicine physician in 2024
3,493 Medicare Part D claims for 217 beneficiaries, against an average of 3,176 among the 108,855 providers of this specialty who prescribed in Part D. Brand-name drugs were 11% of claims. 140 claims were for opioids.
Most prescribed
- Atorvastatin Calcium207 claims
- Amlodipine Besylate181 claims
- Losartan Potassium156 claims
- Levothyroxine Sodium122 claims
- Tamsulosin Hcl101 claims
- Rosuvastatin Calcium89 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Bills Medicare through one group practice
- Desert Sage Internal Medicine LtdOro Valley, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert William Irwin among 2,853 internal medicine physician records in Arizona
Robert William Irwin, MD is one of 2,853 internal medicine physician records with a practice address in Arizona. 75% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 55% newer
- In a Medicare fileYes · 75% of these records are
- In the CMS Doctors and Clinicians fileYes · 58% of these records are
- Graduated1997 · median 2003 among the 1,643 with a school on file
- Record last updated2010 · 51% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207R00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
14 internal medicine physician records list a practice address in Oro Valley
They are 14 of the 542 NPPES records with a practice address in Oro Valley, and 2,853 internal medicine physician records in Arizona.
All 2,853 in Arizona → Every provider in Oro Valley → Internal Medicine Physician nationwide →
The 8 internal medicine physician records with the nearest ZIP codes
- Christopher Baldwin, MDTucson, AZ 857551033159074
- Arjuna DharmarajaOro Valley, AZ 857551649730888
- Dylan Doss, D.O.Oro Valley, AZ 857551609308006
- Pamela Dowell, MDOro Valley, AZ 857551326059239
- Ross Henderson, M.D.Oro Valley, AZ 857551740698414
- Clarence Hindman, M.D.Oro Valley, AZ 857551003148990
- Greggory MixOro Valley, AZ 857551780614743
- Benjamin Sarsah, MDOro Valley, AZ 857551144483132
Common questions
What is Robert William Irwin, MD's NPI number?
Robert William Irwin, MD's National Provider Identifier (NPI) is 1215948039, issued on Aug 10, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert William Irwin, MD located?
The NPPES record lists a practice address at 1834 E Innovation Park Dr, Oro Valley, AZ, 85755. Phone: (520) 825-9656. Providers update this record themselves, so call before visiting.
How can I verify Robert William Irwin, MD's license?
NPPES lists Arizona license number 28417, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert William Irwin, MD prescribe under Medicare Part D?
In 2024, Robert William Irwin, MD had 3,493 Medicare Part D claims for 217 beneficiaries; the average among internal medicine physician prescribers was 3,176. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.