Dr. Marc J. Alonzo, MD
- Medicare services, 2024
- 1,430
- Medicare patients, 2024
- 737
- Part D claims, 2022
- 15
- Publications
- 10
- MIPS score, 2024
- 85
- Practice address
- 2650 Ridge Ave, Evanston, IL 60201
- Practice phone
- Call (847) 570-2000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Alonzo's professional email, personal email and mobile number
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Dr. Marc J. Alonzo is an interventional radiologist in Evanston, Illinois
Dr. Alonzo practices at Evanston Hospital in Evanston, Illinois, part of Endeavor Health.
Dr. Alonzo's NPI, 1033142351, was assigned on July 9, 2006. Dr. Alonzo graduated from University of Missouri, Columbia School of Medicine in 1996.
- NPI
- 1033142351NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6800788449
- NPI enumeration date
- July 9, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (847) 570-2000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 56
- Medical school graduation
- 1996
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Marc J. Alonzo practices at Evanston Hospital in Evanston, Illinois
Dr. Alonzo's primary practice is Evanston Hospital, at 2650 Ridge Ave, Evanston, IL 60201 in Cook County. The practice phone is (847) 570-2000.
- Evanston Hospital2650 Ridge Ave, Evanston, IL 60201 · Cook CountyPhone(847) 570-2000
Source: Dmand AI Affiliation Data
Dr. Marc J. Alonzo is affiliated with 2 sites of care and 1 medical group
Dr. Alonzo's primary practice is Evanston Hospital in Evanston, Illinois, part of Endeavor Health. Dr. Alonzo is also affiliated with Swedish Hospital. The medical group on file is Endeavor Health Medical Group.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Marc J. Alonzo's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Alonzo practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Evanston Hospital | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Marc J. Alonzo is one of 187 interventional radiologists in Illinois
Vascular and interventional radiology is Dr. Alonzo's primary specialty in the NPI Registry, under taxonomy code 2085R0204X. Dr. Alonzo has a license on file in Illinois.
Specialties and state licenses
- Vascular and interventional radiology, Illinois
Interventional radiologists near Dr. Alonzo
Counts of interventional radiologists 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. Marc J. Alonzo billed Medicare for 1,430 services in 2024
CMS data shows 1,430 Medicare services from Dr. Alonzo across 36 procedure codes in 2024, for 737 Medicare patients. Medicare paid $104,503 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Alonzo's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Imaging
- 2023: 3742024: 61264%
- Surgery
- 2023: 5112024: 57212%
- Tests and treatments
- 2023: 1512024: 19831%
- Office and hospital visits
- 2023: 582024: 4817%
Dr. Alonzo compared with the Illinois median for interventional radiologists, 2024
- Dr. Alonzo
- Illinois median
- Medicare services
- 1,430vs 92055% above
- Medicare patients
- 737vs 53837% above
- Part D claims
- 15vs 1921% below
Medians across 164 interventional radiologists in Illinois with Dmand AI profiles that report each measure.
Dr. Alonzo'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.
Need commercial claims for Dr. Alonzo?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Alonzo and other interventional radiologists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Marc J. Alonzo treated 737 Medicare patients in 2024, average age 77
CMS counts 737 Medicare patients who saw Dr. Alonzo in 2024. The largest group is 75 to 84, with 287 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 17% are also on Medicaid. Their average risk score is 2.96, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Alonzo's median patient age at 66, with 49% women.
Dr. Alonzo's Medicare patients by age, 2024
Dr. Alonzo's Medicare patients by sex, 2024
- Women39654%
- Men34146%
Chronic conditions among Dr. Alonzo's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis57%
- Chronic kidney disease48%
- Ischemic heart disease46%
- Diabetes44%
- Heart failure42%
- Cancer36%
Share of Medicare patients with each condition. A patient can have several.
Dr. Alonzo's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 66
Patient panel by sex, all payers
- Women49%
- Men50%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Marc J. Alonzo wrote 15 Medicare Part D claims in 2022
In 2022, Dr. Alonzo wrote 15 Medicare Part D claims. Every claim was for a generic drug. They cover 1 drug, with $102 in total drug cost. In 2021, CMS named 21 claims across 1 drug.
Dr. Alonzo's most prescribed drugs by claims, 2022
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Part D claims for drugs CMS names, 2021 to 2022
- 2021
- 2022
- Claims for drugs CMS names
- 2021: 212022: 1529%
Drugs named by CMS: 1 in 2022, 1 in 2021.
Source: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026
Dr. Marc J. Alonzo scored 85 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 85 out of 100 for Dr. Alonzo for performance year 2024, reported as part of a group. Dr. Alonzo accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Alonzo's MIPS scores, performance year 2024
- 85of 100Final score
- 75.9of 100Quality
- 99of 100Promoting Interoperability
- 40of 100Improvement Activities
- 75of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Marc J. Alonzo has 10 publications on record
Dmand AI links 10 papers to Dr. Alonzo, published from 2011 to 2021. 2012 was the busiest year, with 2. The most frequent topics are Endovascular Procedures, Stents and Vascular Patency. Dr. Alonzo has published most often in J Surg Oncol. Dr. Alonzo's most frequent co-authors are Mark S. Talamonti, MD, Eric Elton, MD and Thomas A. Farrell, MBCHB.
Dr. Alonzo's papers by year, 2011 to 2021
Topics Dr. Alonzo writes about most
- Endovascular Procedures
- Stents
- Vascular Patency
- Ampulla of Vater
- Angiography, Digital Subtraction
- Arteriovenous Shunt, Surgical
- Biliary Tract Neoplasms
- Blood Vessel Prosthesis Implantation
Dr. Alonzo's most frequent co-authors
- Mark S. Talamonti, MD4 shared papers
- Eric Elton, MD2 shared papers
- Thomas A. Farrell, MBCHB2 shared papers
Recent publications by Dr. Alonzo
AJR Am J Roentgenol
Semin Vasc Surg
See who Dr. Alonzo researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Alonzo works with, so you can find a warm path to the right interventional radiologists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Marc J. Alonzo received $207,636 in industry payments from 2016 to 2025
CMS Open Payments shows 208 general payments to Dr. Alonzo from 20 drug and device companies from 2016 to 2025. Speaker and faculty fees make up the largest share, 61% of the total. Sirtex Medical Inc paid the most, $199,126.
General payments to Dr. Alonzo by program year, 2016 to 2025
General payments to Dr. Alonzo by kind, 2016 to 2025
- Speaker and faculty fees$126,77361%
- Consulting fees$62,70030%
- Travel and lodging$12,6806%
- Food and beverage$3,4842%
- Honoraria$2,0001%
Companies that paid Dr. Alonzo the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Marc J. Alonzo graduated from University of Missouri, Columbia School of Medicine
Dr. Alonzo graduated from University of Missouri, Columbia School of Medicine in 1996.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Marc J. Alonzo'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 | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Marc J. Alonzo
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. Marc J. Alonzo's NPI number?
Dr. Marc J. Alonzo's NPI number is 1033142351. It was assigned on July 9, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Marc J. Alonzo?
Dr. Marc J. Alonzo is an interventional radiologist in Evanston, Illinois. The primary specialty in the NPI Registry is Vascular & Interventional Radiology Physician (taxonomy code 2085R0204X).
Where does Dr. Marc J. Alonzo practice?
Dr. Alonzo practices at 2650 Ridge Ave, Evanston, IL 60201. Dr. Alonzo's primary practice is Evanston Hospital in Evanston, Illinois, part of Endeavor Health.
What is Dr. Marc J. Alonzo's office phone number?
The practice phone on file for Dr. Alonzo is (847) 570-2000.
Which hospitals is Dr. Marc J. Alonzo affiliated with?
Dr. Alonzo practices at Evanston Hospital in Evanston, Illinois. Dr. Alonzo is also affiliated with Swedish Hospital.
What medical group is Dr. Marc J. Alonzo part of?
Dr. Alonzo is linked to Endeavor Health Medical Group.
Does Dr. Marc J. Alonzo accept Medicare?
Yes. CMS data shows Dr. Alonzo billed Medicare for 1,430 services in 2024, and Dr. Alonzo accepts Medicare assignment.
What is Dr. Marc J. Alonzo's MIPS score?
Dr. Alonzo's MIPS final score for performance year 2024 is 85 out of 100, reported as part of a group.
How many Medicare patients does Dr. Marc J. Alonzo see?
CMS counts 737 Medicare patients who saw Dr. Alonzo in 2024, with an average age of 77.
What services does Dr. Marc J. Alonzo bill to Medicare?
In 2024, Dr. Alonzo's most billed Medicare services were special service (99152), ultrasound (76937) and radiation oncology (77001).
Show 6 more questionsShow fewer questions
Where did Dr. Marc J. Alonzo go to medical school?
Dr. Alonzo graduated from University of Missouri, Columbia School of Medicine in 1996.
What drugs does Dr. Marc J. Alonzo prescribe most?
In 2022 Medicare Part D data, Dr. Alonzo's most prescribed drugs by claims were Pantoprazole Sodium.
Has Dr. Marc J. Alonzo received payments from drug or device companies?
CMS Open Payments shows $207,636 in general payments to Dr. Alonzo from 20 companies from 2016 to 2025. The largest total came from Sirtex Medical Inc.
How long has Dr. Marc J. Alonzo been practicing?
Dr. Alonzo graduated from medical school in 1996, 30 years ago.
Does Dr. Marc J. Alonzo do research?
Dmand AI links 10 publications to Dr. Alonzo, published from 2011 to 2021.
Who does Dr. Marc J. Alonzo publish with?
Dr. Alonzo's most frequent co-authors are Mark S. Talamonti, MD (4 shared papers), Eric Elton, MD (2 shared papers) and Thomas A. Farrell, MBCHB (2 shared papers).
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