Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Joseph Guan, MD, MPH

Individual provider Internal Medicine Physician · NPI 1154986404

Joseph Guan, MD, MPH practises Internal Medicine in Chicago, Illinois. Graduated from Rush Medical College of Rush University in 2021, 5 years ago. Practices with Specialty Physicians of Illinois LLC, a 112-clinician group, works from 4 locations, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
5
Trained at
Rush Medical College of Rush University
Licensed in
IL
In the registry since
2019
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.
MPH — Master of Public Health
A graduate degree in population health.

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Practice location Address checks out

259 E Erie St Ste 2330
Chicago, IL 60611-3926
Phone: (312) 926-6000
Fax: (312) 926-5971
Show map & directions

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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Additional practice locations (3)

  • 600 S Paulina St, Chicago, IL 60612-3806 — (312) 942-7100
  • 1950 W Polk St Ste 5210, Chicago, IL 60612-3723 — (312) 864-4462
  • 3700 W 203rd St Ste 301, Olympia Fields, IL 60461-1182 — (708) 679-2850

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036168139 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 125-077739 (IL)

Record details

NPI number1154986404
Entity typeIndividual (Type 1)
GenderMale
Credentials MD , MPH
Sole proprietorYes
NPI enumeratedMay 2, 2019
Last updated in NPPESSeptember 15, 2026
Certification dateSeptember 15, 2026

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Medical schoolRUSH MEDICAL COLLEGE OF RUSH UNIVERSITY
Graduated 2021 (5 years in practice)
Group practice Specialty Physicians Of Illinois Llc — 112 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients68
Services billed 110 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Payments from drug and device companies, 2025

Drug and device makers are required by federal law (the Physician Payments Sunshine Act) to report what they pay or give to clinicians, and CMS publishes the reports as Open Payments. This is the 2025 program year. A report is a record of a payment, not an allegation of anything, and many are small items such as meals. Only general payments are listed here; research payments and ownership or investment interests are reported separately by CMS and are not shown.

Food and Beverage $163 9 payments · a meal or drink at a meeting or visit, not a fee

Each amount is the sum of what companies reported for that kind of payment in 2025, rounded to the dollar. Not all of it is income to the clinician: a meal is not a fee, a charitable contribution goes to a charity, and a royalty or an acquisition payment is not a salary.

Check a report, or dispute one, at the source in CMS’s own tool, Open Payments. Corrections go through CMS’s dispute process. This site removes a home address on request and asks for no proof, because that is privacy; it will not remove an accurate payment report on request, because that is a statutory public disclosure.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician. Those with a page here are linked.

Colleagues at Specialty Physicians of Illinois LLC

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 112 clinicians in the practice; 12 are shown here.

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