DR. DHEERAJ MAHAJAN M.D.
NPI 1831133693
Internal Medicine in Oak Park, IL

Q: What is Dheeraj Mahajan's NPI number?

The NPI number for Dheeraj Mahajan is 1831133693. It was assigned to this individual provider in the NPPES registry on June 15, 2006.

Q: What is Dheeraj Mahajan's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Q: When was this NPI record last updated?

The NPPES record for Dheeraj Mahajan was last updated on March 17, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since June 15, 2006PECOS EnrolledAccepts Medicare Assignment

101 MADISON ST STE 300, OAK PARK, IL 60302(708) 486-2700(708) 486-2700 Get Directions Write a Review

NPPES record last updated: March 17, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

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About Dr. Dheeraj Mahajan M.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DHEERAJ MAHAJAN M.D. (NPI 1831133693) is an individual internal medicine provider in Oak Park, Illinois, licensed in Illinois (036106392) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS, is affiliated with Loyola University Medical Center, and is a graduate of Other (1997).

NPPES Registry Identity

NPI1831133693

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. DHEERAJ MAHAJANCredential: M.D.

Location Address101 MADISON ST STE 300Oak Park, IL 60302-4210

Mailing Address101 Madison St Ste 300Oak Park, IL 60302-4210 · (708) 486-2700 · Fax (708) 486-2702

Phone(708) 486-2700

Fax(708) 486-2700

Sole ProprietorYes

Medical School CMSOtherGraduated 1997

Enumeration DateJune 15, 2006

Last NPPES UpdateMarch 17, 2026

NPPES CertifiedMarch 17, 2026

✔ NPI 1831133693 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Licenses✔ Licensed in IL · 036106392✔ Licensed in IL · 036-106392

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

101 MADISON ST STE 300, Oak Park, IL 60302

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Other Identifiers 1

Medicaid036106392IL

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Home State Health, Ambetter Health, Ambetter Health of Delaware.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Dheeraj Mahajan M.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3779476197

PECOS Enrollment IDI20040207000226

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Areas of Expertise CMS Part B claims 6

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Administration of influenza virus vaccine G0008

The administration of the influenza virus vaccine, also known as the flu shot, is a simple procedure to protect against the flu. A healthcare provider injects a small dose of the vaccine into your arm. This stimulates your immune system to produce antibodies, which will help your body fight off the flu if exposed.

2,135 services2,131 patients

Influenza vaccine, inactivated 90653

The Influenza vaccine, inactivated, is a shot given to protect against the flu. It contains killed virus particles that help your body build immunity to the flu. It's recommended annually to keep your protection up-to-date. It's safe for ages 6 months and up.

1,828 services1,828 patients

Administration of pneumococcal, influenza, hepatitis b, and/or covid-19 vaccine inside a patient's home; reported only once per individual home per date of service when such vaccine administration(s) are performed at the patient's home M0201

The Covid-19 vaccine can be administered at your home for convenience and safety. This service is reported once per home, per date, when only the vaccine is given. It's a straightforward process where a medical professional visits your home to give the vaccine.

278 services267 patients

Pneumococcal conjugate vaccine, 20 valent (pcv20), for intramuscular use 90677

The Pneumococcal Conjugate Vaccine (PCV20) is a shot given to protect against 20 types of bacteria that can cause serious infections like pneumonia and meningitis. It's administered through a muscle, usually in the arm. It's important for overall health.

108 services108 patients

Administration of pneumococcal vaccine G0009

The pneumococcal vaccine helps protect against pneumococcal bacteria, which can cause severe infections like pneumonia and meningitis. The vaccine is given as an injection, typically in the arm. It's recommended for infants, older adults, and those with certain health conditions.

105 services105 patients

Influenza vaccine split virus, preservative free 90662

The Influenza Vaccine Split Virus, preservative-free, is a flu shot to protect against the influenza virus. It is made from parts of inactivated flu viruses and doesn't contain preservatives, reducing potential side effects. It helps your body develop immunity to the flu.

17 services17 patients

Hospital Affiliations CMS Care Compare

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Loyola University Medical Center

Acute Care Hospitals · Maywood, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140276

Location2160 S 1st AvenueMaywood, IL 60153 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60302 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$138.86 typical visit price

range $60.08 – $183.39

Typical copayment $34.71 (range $15.02 – $45.84)

Most-billed visit code 99204

Established Patient

$105.70 typical visit price

range $18.97 – $148.12

Typical copayment $26.42 (range $4.74 – $37.03)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

CIMPAR AT HOME, LLC

Home Health