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

Mark E Mass, MD

Individual provider Emergency Medical Services (Emergency Medicine) Physician · NPI 1841276847

Mark E Mass, MD is an Emergency Medicine in Lake Forest, Illinois. Graduated from University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb) in 1988, 38 years ago. Practices with Mass Medical SC, a 5-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
38
Trained at
University of Illinois College of Med (CHI/PEOR/ROCK/Chm-Urb)
Licensed in
IL
In the registry since
2005
Specialties on file
5
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

1025 W Everett Rd Ste 101
Lake Forest, IL 60045-2697
Phone: (847) 234-7950
Fax: (847) 234-7940
Show map & directions

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

Specialties & licences

Urgent Care Clinic/Center (primary) Taxonomy 261QU0200X · Licence 036-093222 (IL)
Emergency Medical Services (Emergency Medicine) Physician Taxonomy 207PE0004X · Licence 36093222 (IL)
Occupational Medicine Physician Taxonomy 2083X0100X · Licence 036-093222 (IL)
Emergency Medicine Physician Taxonomy 207P00000X · Licence 036-093222 (IL)
Occupational Medicine Clinic/Center Taxonomy 261QX0100X · Licence 036-093222 (IL)

Record details

NPI number1841276847
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedDecember 21, 2005
Last updated in NPPESApril 23, 2014
Mailing address475 McCormick Dr, Lake Forest, IL 60045-3349

Medicare enrollment

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

Medicare specialtyEMERGENCY MEDICINE
Medical schoolUNIVERSITY OF ILLINOIS COLLEGE OF MED (CHI/PEOR/ROCK/CHM-URB)
Graduated 1988 (38 years in practice)
Group practice Mass Medical Sc — 5 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Other providers in Lake Forest