Dr. Robert William Irwin, MD
- Medicare services, 2024
- 784
- Medicare patients, 2024
- 205
- Part D claims, 2024
- 3,493
- Hospital affiliations
- 2
- Industry payments
- $1,051
- Practice address
- 1834 E Innovation Park Dr, Oro Valley, AZ 85755
- Practice phone
- Call (520) 825-9656
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Desert Sage Internal Medicine, Ltd
Oro Valley, Arizona
Find Dr. Irwin's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Robert William Irwin is an internist in Oro Valley, Arizona
Dr. Irwin practices at Desert Sage Internal Medicine, Ltd in Oro Valley, Arizona.
Dr. Irwin's NPI, 1215948039, was assigned on August 10, 2006. Dr. Irwin graduated from University of Missouri, Columbia School of Medicine in 1997. Dr. Irwin holds Arizona license 28417.
- NPI
- 1215948039NPI Registry (opens in a new tab)
- Medicare PAC ID
- 7618869926
- NPI enumeration date
- August 10, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (520) 825-9656
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 55
- Medical school graduation
- 1997
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Robert William Irwin practices at Desert Sage Internal Medicine, Ltd in Oro Valley, Arizona
Dr. Irwin's primary practice is Desert Sage Internal Medicine, Ltd, at 1834 E Innovation Park Dr, Oro Valley, AZ 85755 in Pima County. The practice phone is (520) 825-9656.
- Desert Sage Internal Medicine, Ltd1834 E Innovation Park Dr, Oro Valley, AZ 85755 · Pima CountyPhone(520) 825-9656
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert William Irwin is affiliated with 5 sites of care and 1 medical group
Dr. Irwin's primary practice is Desert Sage Internal Medicine, Ltd in Oro Valley, Arizona. Dr. Irwin is also affiliated with Oro Valley Hospital. The medical group on file is Desert Sage Internal Medicine. Dmand AI also links Dr. Irwin to 1 more hospital, 1 group practice or clinic and 1 home health agency, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Robert William Irwin's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Irwin practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Desert Sage Internal Medicine, Ltd | Available with a free account |
| +4 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Robert William Irwin is one of 2,420 internists in Arizona
Internal medicine is Dr. Irwin's primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Irwin is licensed in Arizona.
Specialties and state licenses
- Internal medicine, ArizonaPrimary
Internists near Dr. Irwin
Counts of internists with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Robert William Irwin billed Medicare for 784 services in 2024
CMS data shows 784 Medicare services from Dr. Irwin across 11 procedure codes in 2024, for 205 Medicare patients. Medicare paid $33,729 for them. Every service was in an office.
Dr. Irwin's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 4542024: 40511%
- Surgery
- 2023: 2972024: 2709%
- Lab and pathology
- 2023: 432024: 479%
- Tests and treatments
- 2023: 322024: 3716%
- Other services
- 2023: 322024: 2522%
Dr. Irwin compared with the Arizona median for internists, 2024
- Dr. Irwin
- Arizona median
- Medicare services
- 784vs 47665% above
- Medicare patients
- 205vs 205Close to median
- Part D claims
- 2,810vs 26010.8 times
Medians across 2,300 internists in Arizona with Dmand AI profiles that report each measure.
Dr. Irwin's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Irwin and other internists in Arizona.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Robert William Irwin treated 205 Medicare patients in 2024, average age 80
CMS counts 205 Medicare patients who saw Dr. Irwin in 2024. The largest group is 75 to 84, with 122 patients. 70% of them have high cholesterol, and 68% have high blood pressure. Their average risk score is 0.92, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Irwin's median patient age at 81, with 38% women.
Dr. Irwin's Medicare patients by age, 2024
Dr. Irwin's Medicare patients by sex, 2024
- Women7537%
- Men13063%
Chronic conditions among Dr. Irwin's Medicare patients, 2024
- High cholesterol70%
- High blood pressure68%
- Arthritis35%
- Ischemic heart disease21%
- Diabetes19%
- Atrial fibrillation16%
- Cancer16%
- Anxiety14%
Share of Medicare patients with each condition. A patient can have several.
Dr. Irwin's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 81
Patient panel by sex, all payers
- Women38%
- Men61%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Robert William Irwin wrote 3,493 Medicare Part D claims in 2024
In 2024, Dr. Irwin wrote 3,493 Medicare Part D claims for 217 patients. 89% of them were for generic drugs. CMS names the drug for 2,810 of them, across 77 drugs with 11 or more claims each, at $122,729 in total drug cost. In 2023, CMS named 3,087 claims across 84 drugs.
Dr. Irwin's Part D claims by kind of drug, 2024
- Generic3,093 claims89%
- Brand-name380 claims11%
- Other20 claims1%
Dr. Irwin's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Irwin's Part D claims, 2024
- Opioids4%140 of 3,493 claims
- Antibiotics3%111 of 3,493 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 3,0872024: 2,8109%
Drugs named by CMS: 77 in 2024, 84 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Robert William Irwin takes part in Medicare
Dr. Irwin accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of skin lesions: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Robert William Irwin received $1,051 in industry payments from 2016 to 2021
CMS Open Payments shows 37 general payments to Dr. Irwin from 8 drug and device companies from 2016 to 2021. Food and beverage make up the largest share, 98% of the total. GlaxoSmithKline, LLC. paid the most, $256.
General payments to Dr. Irwin by program year, 2016 to 2021
General payments to Dr. Irwin by kind, 2016 to 2021
- Food and beverage$1,02898%
- Entertainment$141%
- Education$91%
Companies that paid Dr. Irwin the most, 2016 to 2021
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert William Irwin graduated from University of Missouri, Columbia School of Medicine
Dr. Irwin graduated from University of Missouri, Columbia School of Medicine in 1997.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Robert William Irwin's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Robert William Irwin
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Robert William Irwin's NPI number?
Dr. Robert William Irwin's NPI number is 1215948039. It was assigned on August 10, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert William Irwin?
Dr. Robert William Irwin is an internist in Oro Valley, Arizona. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Robert William Irwin practice?
Dr. Irwin practices at 1834 E Innovation Park Dr, Oro Valley, AZ 85755. Dr. Irwin's primary practice is Desert Sage Internal Medicine, Ltd in Oro Valley, Arizona. Dmand AI also links Dr. Irwin to 1 hospital, 1 group practice or clinic and 1 home health agency.
What is Dr. Robert William Irwin's office phone number?
The practice phone on file for Dr. Irwin is (520) 825-9656.
What is Dr. Robert William Irwin's medical license number?
Dr. Irwin holds Arizona license 28417.
Which hospitals is Dr. Robert William Irwin affiliated with?
Dr. Irwin is affiliated with Oro Valley Hospital. Dmand AI links Dr. Irwin to 1 more hospital.
What medical group is Dr. Robert William Irwin part of?
Dr. Irwin is linked to Desert Sage Internal Medicine.
Does Dr. Robert William Irwin accept Medicare?
Yes. CMS data shows Dr. Irwin billed Medicare for 784 services in 2024, and Dr. Irwin accepts Medicare assignment.
How many Medicare patients does Dr. Robert William Irwin see?
CMS counts 205 Medicare patients who saw Dr. Irwin in 2024, with an average age of 80.
What services does Dr. Robert William Irwin bill to Medicare?
In 2024, Dr. Irwin's most billed Medicare services were surgery: heart and blood vessels (36415), office visit, established patient (99213) and office visit, established patient (99214).
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Where did Dr. Robert William Irwin go to medical school?
Dr. Irwin graduated from University of Missouri, Columbia School of Medicine in 1997.
What drugs does Dr. Robert William Irwin prescribe most?
In 2024 Medicare Part D data, Dr. Irwin's most prescribed drugs by claims were Atorvastatin Calcium, Amlodipine Besylate and Losartan Potassium.
Has Dr. Robert William Irwin received payments from drug or device companies?
CMS Open Payments shows $1,051 in general payments to Dr. Irwin from 8 companies from 2016 to 2021. The largest total came from GlaxoSmithKline, LLC.
How long has Dr. Robert William Irwin been practicing?
Dr. Irwin graduated from medical school in 1997, 29 years ago.
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