NPPES file of Aug 9, 2026

Gregory C. Vachon, M.D.

Internal Medicine Physician · Chicago, IL

Gregory C. Vachon, M.D. is an internal medicine physician with a practice address in Chicago, Illinois, and NPI 1376577841, issued on Jul 10, 2006. Check the license (Illinois 036089597, as entered in NPPES) on the Illinois Department of Financial and Professional Regulation; the federal record below is the public data PlainDoctor holds for this provider.

Record from CMS NPPES, file of Aug 9, 2026 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1376577841
Name
Gregory C. Vachon
Credential
M.D.
Primary taxonomy
Internal Medicine Physician 207R00000X
License number
036089597 IL
Self-reported in NPPES; status is on the state search
Practice location
4259 S Berkeley Ave, Chicago, IL 60653
Phone
(312) 285-7678
Enumerated
Jul 10, 2006
Record last updated
Apr 3, 2012 (not updated in 14 years: call before relying on the address or phone)
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). A record is not a license: verify it with the state board.
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8 nearest internal medicine physician records → All 7,238 in Illinois → Look up another NPI →

Also registered at 4259 S Berkeley Ave

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Miguel Bautista, CADCAddiction (Substance Use Disorder) Counselor1245885474
  2. Jenny Cha-Kim, M.D.Pediatrics Physician1346258563
  3. Mary Gondek, APNFamily Nurse Practitioner1447691977
  4. Elieen Good, MWFAdvanced Practice Midwife1619053402
  5. Marvin Green, CADCAddiction (Substance Use Disorder) Counselor1821783093
  6. Kayla Jones, APNFamily Nurse Practitioner1528553013

Verify Gregory C. Vachon in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersIllinois Department of Financial and Professional Regulation
    Search for license 036089597    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Illinois license search

PlainDoctor does not match the HHS-OIG exclusion list to individual records: most entries carry no NPI. Search the OIG exclusion list by name.

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Gregory C. Vachon among 7,238 internal medicine physician records in Illinois

Gregory C. Vachon, M.D. is one of 7,238 internal medicine physician records with a practice address in Illinois. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 7% of them.

  • NPI issued2006 · 7% of these records are older, 61% newer
  • In a Medicare fileNo · 73% of these records are
  • In the CMS Doctors and Clinicians fileNo · 50% of these records are
  • Record last updated2012 · 47% 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 Illinois practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).

2,867 internal medicine physician records list a practice address in Chicago

They are 2,867 of the 63,379 NPPES records with a practice address in Chicago, and 7,238 internal medicine physician records in Illinois. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.

All 7,238 in Illinois → Every provider in Chicago → Internal Medicine Physician nationwide →

The 8 internal medicine physician records with the nearest ZIP codes

  1. Michael Davenport, MDChicago, IL 606531780619635
  2. Catherine Glunz, M.D.Chicago, IL 606531043338601
  3. David Kiragu, M.D.Chicago, IL 606531982860367
  4. Marina Mathew, M.D,Chicago, IL 606531487843330
  5. David Scheiner, M.D.Chicago, IL 606531477660371
  6. Benjamin Van Voorhees, MDChicago, IL 606531982615175
  7. Maria Avendano, MDChicago, IL 606521578052130
  8. Marcie Claybon, MDChicago, IL 606541831344373

Common questions

What is Gregory C. Vachon, M.D.'s NPI number?

Gregory C. Vachon, M.D.'s National Provider Identifier (NPI) is 1376577841, issued on Jul 10, 2006. An NPI identifies a provider in billing; it is not a license.

Where is Gregory C. Vachon, M.D. located?

The NPPES record lists a practice address at 4259 S Berkeley Ave, Chicago, IL, 60653. Phone: (312) 285-7678. Providers update this record themselves, so call before visiting.

How can I verify Gregory C. Vachon, M.D.'s license?

NPPES lists Illinois license number 036089597, as entered by the provider. Search the Illinois Department of Financial and Professional Regulation at https://idfpr.illinois.gov/checklicense.html. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.

Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. An NPI identifies who bills; it is not a license.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.