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

Dr. Mark K Isoniemi, MD

Individual provider Family Medicine Physician · NPI 1295779239

Dr. Mark K Isoniemi, MD is a Family Practice in Wheaton, Illinois. Graduated from Ohio State University College of Medicine in 1997, 29 years ago. Practices with Dupage Medical Group Ltd, a 1,328-clinician group, accepts Medicare assignment and offers telehealth. Licensed in Illinois.

Years since qualifying
29
Trained at
Ohio State University College of Medicine
Licensed in
IL
In the registry since
2006
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

150 E Willow Ave
Wheaton, IL 60187-5476
Phone: (630) 510-6900
Fax: (630) 871-6706
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Family Medicine Physician (primary) Taxonomy 207Q00000X · Licence 036101563 (IL)

Record details

NPI number1295779239
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorNo
NPI enumeratedJune 16, 2006
Last updated in NPPESAugust 8, 2023
Certification dateJune 17, 2022
Mailing addressPo Box 713260, Chicago, IL 60677-1260

Medicare enrollment

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

Medicare specialtyFAMILY PRACTICE
Medical schoolOHIO STATE UNIVERSITY COLLEGE OF MEDICINE
Graduated 1997 (29 years in practice)
Group practice Dupage Medical Group Ltd — 1328 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services
Practice locations8 on file with Medicare

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