Physician Profile
Ernesto J. Villegas, M.D.
Unclaimed ProfileAbout Dr. Villegas
Ernesto J. Villegas, M.D. practices internal medicine in Chicago, IL. Ernesto is a 1985 graduate of Stanford University School of Medicine. According to Medicare claims data, Ernesto cared for 172 Medicare patients across 246 services. The services billed most often include established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more, established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more, and remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it — free, and no identity document with a practice or institutional email.
Education & Training
Specialty
Credentials & Licensing
License numbers are what the provider reported to NPPES when the NPI was issued or updated. NPPES does not verify licensure; confirm current standing with the state licensing board.
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (312) 733-0909
- Email not available
Practice Locations
311 N ABERDEEN ST STE 100B
Chicago, IL 60607
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
Blood disorders
Brain & Nerves
Brain and nerves
Cardiac and vascular
Digestive
Heart & Circulation
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
Preventive and evaluation
Screening and diagnostic testing
Bones & Joints
Brain and nerves
Cancer screening
Digestive
Exams & Consultations
Heart & Circulation
Heart health
Imaging referral
Immunizations
Lab tests
Lungs & Breathing
Metabolic & Weight
Minor procedures
Office procedures
Office Procedures
Pain management
Preventive & Routine Care
Screenings & Diagnostics
Sexual health
Procedures Most Often Billed to Medicare
246 services · 172 patients · 8 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more | Office visit | 99215 |
75 | More often than most peers in Internal Medicine |
| Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more | Office visit | 99214 |
46 | Less often than most peers in Internal Medicine |
| Remote monitoring of physiologic parameters, initial supply of devices with daily recordings or programmed alerts transmission, each 30 days | Office visit | 99454 |
36 | Less often than most peers in Internal Medicine |
| Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | Billing code | G0439 |
27 | Less often than most peers in Internal Medicine |
| Management using the results of remote vital sign monitoring per calendar month, first 20 minutes | Office visit | 99457 |
27 | Less often than most peers in Internal Medicine |
| Administration of influenza virus vaccine | Billing code | G0008 |
13 | Less often than most peers in Internal Medicine |
| Remote monitoring of physiologic parameters, initial set-up and patient education on use of equipment | Office visit | 99453 |
11 | Less often than most peers in Internal Medicine |
| New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more | Office visit | 99205 |
11 | Less often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Related specialists at this location 1
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 2
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
Other internists in Chicago 8
Same specialty, same city.
More connections — 16 related providers in 2 groups
Trained at Stanford University School of Medicine 8
Other providers in the same specialty who trained at the same institution.
Class of 1985 at Stanford University School of Medicine 8
Providers who graduated from the same medical school in the same year.
Common questions
What is Ernesto J. Villegas's specialty?
Ernesto J. Villegas is an internist in Chicago, IL. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where can I find Ernesto J. Villegas?
Ernesto J. Villegas is listed at 311 N Aberdeen St Ste 100B, Chicago, IL 60607. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
How do I contact Ernesto J. Villegas?
The number on file is (312) 733-0909. Guide.md cannot book appointments or pass on messages — please call the office directly.
NPI registry
What is Ernesto J. Villegas's NPI number?
Ernesto J. Villegas's National Provider Identifier is 1871634774. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
What is Ernesto J. Villegas's education?
Ernesto J. Villegas attended Stanford University School of Medicine, graduating in 1985. This comes from the CMS National Downloadable File.
CMS public data
How long has Ernesto J. Villegas been practicing?
Ernesto J. Villegas has 41 years experience. Calculated from a graduation year of 1985, reported in the CMS National Downloadable File.
CMS public data
What is Ernesto J. Villegas known for?
According to Medicare billing data, Ernesto J. Villegas the Medicare record under this individual NPI shows mainly office visits and diagnostic testing. Hospital-based physicians usually have their procedural work billed by the facility rather than under their own number, so this is a floor on their practice, not a description of it. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Has Ernesto J. Villegas confirmed this information?
Not yet. This profile is built from public federal data and has not been confirmed by Ernesto J. Villegas. If this is you, claiming it is free.
Guide.md
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.