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

Individual provider Internal Medicine Physician · NPI 1831133693

Dr. Dheeraj Mahajan, MD is an Internal Medicine in Oak Park, Illinois. Qualified in 1997, 29 years ago. Practices with Cimpar SC, a 36-clinician group and accepts Medicare assignment. Licensed in Illinois.

Years since qualifying
29
Licensed in
IL
In the registry since
2006
Specialties on file
2
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

101 Madison St Ste 300
Oak Park, IL 60302-4210
Phone: (708) 486-2700
Fax: (708) 486-2700
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Internal Medicine Physician (primary) Taxonomy 207R00000X · Licence 036106392 (IL)
Internal Medicine Physician Taxonomy 207R00000X · Licence 036-106392 (IL)

Record details

NPI number1831133693
Entity typeIndividual (Type 1)
GenderMale
Credentials MD
Sole proprietorYes
NPI enumeratedJune 15, 2006
Last updated in NPPESMarch 17, 2026
Certification dateMarch 17, 2026

Medicare enrollment

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

Medicare specialtyINTERNAL MEDICINE
Medical schoolOTHER
Graduated 1997 (29 years in practice)
Group practice Cimpar Sc — 36 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

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