Dr. Ernesto J. Villegas, MD
- Medicare services, 2024
- 246
- Medicare patients, 2024
- 85
- Part D claims, 2024
- 1,068
- Hospital affiliations
- 2
- Industry payments
- $170
- Practice address
- 1653 West Congress Parkway, Chicago, IL 60612
- Practice phone
- Call (312) 942-5000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Dr. Villegas' 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. Ernesto J. Villegas is an internist in Chicago, Illinois
Dr. Villegas practices at Rush University Medical Center in Chicago, Illinois, part of Rush System for Health.
Dr. Villegas' NPI, 1871634774, was assigned on February 12, 2007. Dr. Villegas graduated from Stanford University School of Medicine in 1985.
- NPI
- 1871634774NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072743210
- NPI enumeration date
- February 12, 2007
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (312) 942-5000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 67
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Ernesto J. Villegas practices at Rush University Medical Center in Chicago, Illinois
Dr. Villegas' primary practice is Rush University Medical Center, at 1653 West Congress Parkway, Chicago, IL 60612 in Cook County. The practice phone is (312) 942-5000.
- Rush University Medical Center1653 West Congress Parkway, Chicago, IL 60612 · Cook CountyPhone(312) 942-5000
Source: Dmand AI Affiliation Data
Dr. Ernesto J. Villegas is affiliated with 2 sites of care and 1 medical group
Dr. Villegas' primary practice is Rush University Medical Center in Chicago, Illinois, part of Rush System for Health. Dr. Villegas is also affiliated with Tampa General Hospital Brooksville. The medical group on file is Rush University Internists.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Ernesto J. Villegas' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Villegas practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Rush University Medical Center | 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. Ernesto J. Villegas is one of 5,652 internists in Illinois
Internal medicine is Dr. Villegas' primary specialty in the NPI Registry, under taxonomy code 207R00000X. Dr. Villegas has a license on file in Illinois.
Specialties and state licenses
- Internal medicine, Illinois
Internists near Dr. Villegas
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. Ernesto J. Villegas billed Medicare for 246 services in 2024
CMS data shows 246 Medicare services from Dr. Villegas across 8 procedure codes in 2024, for 85 Medicare patients. Medicare paid $22,135 for them. Every service was in an office.
Dr. Villegas' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 1522024: 20636%
- Other services
- 2023: 272024: 4048%
Dr. Villegas compared with the Illinois median for internists, 2024
- Dr. Villegas
- Illinois median
- Medicare services
- 246vs 56657% below
- Medicare patients
- 85vs 20859% below
- Part D claims
- 673vs 2842.4 times
Medians across 5,192 internists in Illinois with Dmand AI profiles that report each measure.
Dr. Villegas' 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. Villegas and other internists in Illinois.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Ernesto J. Villegas treated 85 Medicare patients in 2024, average age 70
CMS counts 85 Medicare patients who saw Dr. Villegas in 2024. The largest group is 65 to 74, with 43 patients. 74% of them have high cholesterol, and 67% have high blood pressure. 26% are also on Medicaid. Their average risk score is 1.48, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Villegas' median patient age at 44, with 30% women.
Dr. Villegas' Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Dr. Villegas' Medicare patients by sex, 2024
- Women3642%
- Men4958%
Chronic conditions among Dr. Villegas' Medicare patients, 2024
- High cholesterol74%
- High blood pressure67%
- Arthritis39%
- Ischemic heart disease35%
- Diabetes25%
- Anxiety22%
- Chronic kidney disease22%
- Mood disorders19%
Share of Medicare patients with each condition. A patient can have several.
Dr. Villegas' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women30%
- Men69%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Ernesto J. Villegas wrote 1,068 Medicare Part D claims in 2024
In 2024, Dr. Villegas wrote 1,068 Medicare Part D claims for 107 patients. 88% of them were for generic drugs. CMS names the drug for 673 of them, across 20 drugs with 11 or more claims each, at $60,410 in total drug cost. In 2023, CMS named 590 claims across 26 drugs.
Dr. Villegas' Part D claims by kind of drug, 2024
- Generic939 claims88%
- Brand-name116 claims11%
- Other13 claims1%
Dr. Villegas' 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. Villegas' Part D claims, 2024
- Opioids3%27 of 1,068 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: 5902024: 67314%
Drugs named by CMS: 20 in 2024, 26 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
Dr. Ernesto J. Villegas offers telehealth to Medicare patients
Dr. Villegas accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Villegas as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Ernesto J. Villegas received $170 in industry payments from 2016 to 2024
CMS Open Payments shows 2 general payments to Dr. Villegas from 2 drug and device companies from 2016 to 2024. Food and beverage make up the largest share, 100% of the total. Davol Inc. paid the most, $158.
General payments to Dr. Villegas by program year, 2016 to 2024
Companies that paid Dr. Villegas the most, 2016 to 2024
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Ernesto J. Villegas graduated from Stanford University School of Medicine
Dr. Villegas graduated from Stanford University School of Medicine in 1985.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Ernesto J. Villegas'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)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) |
| 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. Ernesto J. Villegas
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. Ernesto J. Villegas' NPI number?
Dr. Ernesto J. Villegas' NPI number is 1871634774. It was assigned on February 12, 2007, and it is active in the NPI Registry.
What kind of doctor is Dr. Ernesto J. Villegas?
Dr. Ernesto J. Villegas is an internist in Chicago, Illinois. The primary specialty in the NPI Registry is Internal Medicine Physician (taxonomy code 207R00000X).
Where does Dr. Ernesto J. Villegas practice?
Dr. Villegas practices at 1653 West Congress Parkway, Chicago, IL 60612. Dr. Villegas' primary practice is Rush University Medical Center in Chicago, Illinois, part of Rush System for Health.
What is Dr. Ernesto J. Villegas' office phone number?
The practice phone on file for Dr. Villegas is (312) 942-5000.
Which hospitals is Dr. Ernesto J. Villegas affiliated with?
Dr. Villegas practices at Rush University Medical Center in Chicago, Illinois. Dr. Villegas is also affiliated with Tampa General Hospital Brooksville.
What medical group is Dr. Ernesto J. Villegas part of?
Dr. Villegas is linked to Rush University Internists.
Does Dr. Ernesto J. Villegas accept Medicare?
Yes. CMS data shows Dr. Villegas billed Medicare for 246 services in 2024, and Dr. Villegas accepts Medicare assignment.
Does Dr. Ernesto J. Villegas offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Villegas as offering telehealth services.
How many Medicare patients does Dr. Ernesto J. Villegas see?
CMS counts 85 Medicare patients who saw Dr. Villegas in 2024, with an average age of 70.
What services does Dr. Ernesto J. Villegas bill to Medicare?
In 2024, Dr. Villegas' most billed Medicare services were office visit, established patient (99215), office visit, established patient (99214) and care management and other visits (99454).
Show 4 more questionsShow fewer questions
Where did Dr. Ernesto J. Villegas go to medical school?
Dr. Villegas graduated from Stanford University School of Medicine in 1985.
What drugs does Dr. Ernesto J. Villegas prescribe most?
In 2024 Medicare Part D data, Dr. Villegas' most prescribed drugs by claims were Atorvastatin Calcium, Metformin HCl and Losartan Potassium.
Has Dr. Ernesto J. Villegas received payments from drug or device companies?
CMS Open Payments shows $170 in general payments to Dr. Villegas from 2 companies from 2016 to 2024. The largest total came from Davol Inc.
How long has Dr. Ernesto J. Villegas been practicing?
Dr. Villegas graduated from medical school in 1985, 41 years ago.
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