Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Mark J. Tatara, MD

Individual provider Internal Medicine Physician · NPI 1043256324

Mark J. Tatara, MD is an Internal Medicine in Downers Grove, Illinois. Graduated from Chicago College of Medicine and Surgery in 1986, 40 years ago. Practices with Advocate Health and Hospitals Corporation, a 3,079-clinician group, works from 2 locations, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
40
Trained at
Chicago College of Medicine and Surgery
Licensed in
IL
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

See every abbreviation used in this directory →

Practice location Address checks out

6840 Main St Ste 200
Downers Grove, IL 60516
Phone: (630) 869-5382
Fax: (630) 869-5383
Show map & directions

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

Additional practice locations (1)

  • 7900 W Jefferson Blvd, Fort Wayne, IN 46804-4128 — (260) 432-2297

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036-077438 (IL)

Record details

NPI number1043256324
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 22, 2006
Last updated in NPPESDecember 23, 2021
Certification dateDecember 23, 2021
Mailing address6840 Main St Ste 200, Downers Grove, IL 60516-3430

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolCHICAGO COLLEGE OF MEDICINE AND SURGERY
Graduated 1986 (40 years in practice)
Group practice Advocate Health And Hospitals Corporation — 3079 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations3 on file with Medicare

Other providers in Downers Grove