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

NPI Status: Active since June 15, 2006

Contact Information

101 MADISON ST STE 300
OAK PARK, IL
ZIP 60302
Phone: (708) 486-2700
Fax: (708) 486-2700

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  • Individual
  • Male
  • Years of Experience 29
  • Internal Medicine
  • Accepts Insurance
  • Accepts Medicare Approved Payment
  • PECOS Enrolled

About DHEERAJ MAHAJAN

This page provides the complete NPI Profile along with additional information for Dheeraj Mahajan, an internist established in Oak Park, Illinois with a medical specialization in Internal Medicine and more than 29 years of experience. The healthcare provider is registered in the NPI registry with number 1831133693 assigned on June 2006. The practitioner's primary taxonomy code is 207R00000X with license number 036106392 (IL). The provider is registered as an individual and his NPI record was last updated March 2026.

NPI
1831133693
Provider Name
DR. DHEERAJ MAHAJAN M.D.
Gender
Male
Entity Type
Individual
Location Address
101 MADISON ST STE 300 OAK PARK, IL 60302
Location Phone
(708) 486-2700
Location Fax
(708) 486-2700
Mailing Address
101 MADISON ST STE 300 OAK PARK, IL 60302
Mailing Phone
(708) 486-2700
Mailing Fax
(708) 486-2700
Medical School Name
OTHER
Graduation Year
1997
Is Sole Proprietor?
Yes
Enumeration Date
06-15-2006
Last Update Date
03-17-2026
Code Navigator

An internist like Dheeraj Mahajan is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification

Internal Medicine

Taxonomy Code
207R00000X
Type
Allopathic & Osteopathic Physicians
License No.
036106392
License State
IL
Taxonomy Description
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No. Taxonomy Code Type Classification /
Specialization
License No. (State)
1207R00000XAllopathic & Osteopathic Physicians

Internal Medicine

036-106392 (IL)

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

  • Complete Gold - EPO
  • Complete Gold + Vision + Adult Dental - EPO
  • Complete Silver - EPO
  • Complete Silver + Vision + Adult Dental - EPO
  • Elite Bronze - EPO
  • Elite Bronze + Vision + Adult Dental - EPO
  • Everyday Bronze - EPO
  • Everyday Bronze + Vision + Adult Dental - EPO
  • Everyday Gold - EPO
  • Everyday Gold + Vision + Adult Dental - EPO
  • Standard Expanded Bronze - EPO
  • Standard Expanded Bronze + Vision + Adult Dental - EPO
  • Standard Gold - EPO
  • Standard Gold + Vision + Adult Dental - EPO
  • Standard Silver - EPO
  • Standard Silver + Vision + Adult Dental - EPO
  • Complete Gold - HMO
  • Complete Gold + Vision + Adult Dental - HMO
  • Elite Bronze - HMO
  • Elite Bronze + Vision + Adult Dental - HMO
  • Elite Gold - HMO
  • Elite Gold + Vision + Adult Dental - HMO
  • Everyday Bronze - HMO
  • Everyday Bronze + Vision + Adult Dental - HMO
  • Everyday Gold - HMO
  • Everyday Gold + Vision + Adult Dental - HMO
  • Focused Silver - HMO
  • Focused Silver + Vision + Adult Dental - HMO
  • Standard Expanded Bronze - HMO
  • Standard Expanded Bronze + Vision + Adult Dental - HMO
  • Standard Gold - HMO
  • Standard Gold + Vision + Adult Dental - HMO
  • Standard Silver - HMO
  • Standard Silver + Vision + Adult Dental - HMO
  • Clear Gold - EPO
  • Clear Gold + Vision + Adult Dental - EPO
  • Complete Gold - EPO
  • Complete Gold + Vision + Adult Dental - EPO
  • Elite Silver - EPO
  • Elite Silver + Vision + Adult Dental - EPO
  • Everyday Bronze - EPO
  • Everyday Bronze + Vision + Adult Dental - EPO
  • Focused Silver - EPO
  • Focused Silver + Vision + Adult Dental - EPO
  • Principal Bronze HSA - EPO
  • Principal Bronze HSA + Vision + Adult Dental - EPO
  • Standard Expanded Bronze - EPO
  • Standard Expanded Bronze + Vision + Adult Dental - EPO
  • Standard Gold - EPO
  • Standard Gold + Vision + Adult Dental - EPO
  • Standard Silver - EPO

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier Type / Code Identifier State Identifier Issuer
036106392MEDICAID (05)IL 

Medicare Participation & PECOS Enrollment Status

Dheeraj Mahajan is registered with Medicare and accepts claims assignment, this means the provider accepts the approved amount for the cost of rendered services as full payment. Participating providers may not charge beneficiaries more than the approved amount for their services. Please keep in mind that beneficiaries still have to pay a coinsurance or copayment amount for a visit or service.

Dheeraj Mahajan is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.

What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.

  • Is the provider registered in PECOS? Yes

  • PECOS PAC ID: 3779476197

    What is the PECOS Associate Control ID?
    A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.

  • PECOS Enrollment ID: I20040207000226

    What is the Provider Enrollment ID?
    The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.

  • Accepts Medicare Assignment? Yes

    What does it mean "accepts medicare assignment"?
    When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
    A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.

  • Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes

  • Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes

  • Eligible to Order or Refer a Home Health Agency (HHA): Yes

  • Eligible to Order or Refer Power Mobility Devices: Yes

Areas of Expertise

The following services and procedures, recently provided to Medicare patients, illustrate the range of care this provider offers. This list reflects the variety of services available to all patients visiting the practice and is based on 2022 Medicare dataset. In general, the more frequently a provider treats specific conditions or performs particular procedures, the more experienced they become in addressing similar patient needs. The provider has delivered many of the services listed below to Medicare patients. Please note that this list does not include services provided to patients who are not covered by Medicare.

Adm sarscov2 100mcg/0.5ml3rd

This is the administration of a third dose of a SARS-CoV-2 vaccine, given in a dose of 100 micrograms in 0.5 milliliters. This vaccine helps your body develop immunity against the COVID-19 virus. It's a crucial step in protecting your health.

This service was performed 29 times for 29 patients

Adm sarscov2 30mcg/0.3ml 3rd

This refers to the administration of a 30 microgram dose of a SARS-CoV-2 vaccine in a 0.3 milliliter volume. It's the third dose, often referred to as a booster shot, which helps to strengthen your body's immune response against the COVID-19 virus.

This service was performed 37 times for 37 patients

Adm sarscov2 30mcg/0.3ml bst

This is an administration of a COVID-19 vaccine, specifically 30 micrograms in a 0.3 milliliter dosage. The vaccine helps your body build protection against the SARS-CoV-2 virus, which causes COVID-19.

This service was performed 1,090 times for 1,087 patients

Adm sarscov2 50 mcg/.5 mlbst

Adm sarscov2 50 mcg/.5 mlbst is a COVID-19 vaccine administration. In this process, a 50 microgram dose of the vaccine is given in a half milliliter volume. This aids your body in building a defense against the virus.

This service was performed 77 times for 75 patients

Adm sarscov2 50mcg/0.25mlbst

This procedure involves administering a dose of a SARS-CoV-2 vaccine. The specific dosage is 50 micrograms in a 0.25 milliliter booster shot. This vaccine helps your body build immunity against the COVID-19 virus. It's a key part of global efforts to control the pandemic.

This service was performed 912 times for 907 patients

Adm sarscov2 vac ad26 .5ml b

The Ad26.COV2.S vaccine is a single-dose shot to protect against COVID-19. It's administered as a 0.5ml injection. The vaccine helps your immune system learn how to fight the virus if you're exposed. It's important to receive it to help curb the pandemic.

This service was performed 17 times for 17 patients

Adm sarscv2 30mcg trs-sucr b

This service involves the administration of a 30mcg dose of the SARS-CoV-2 vaccine, which helps protect against COVID-19. The 'trs-sucr b' indicates it's stabilized with sugars for effectiveness. It's a crucial step in maintaining your health during the pandemic.

This service was performed 341 times for 341 patients

Administration of influenza virus vaccine

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.

This service was performed 61 times for 61 patients

Coronavirus vaccine 13

The "Coronavirus Vaccine 13" isn't a recognized term. However, COVID-19 vaccines help protect against the virus by triggering an immune response. They teach your body how to fight the virus if exposed, reducing the risk of severe illness. It's crucial for public health and safety.

This service was performed 375 times for 375 patients

Coronavirus vaccine 14

The Coronavirus Vaccine 14 is an injection designed to protect you from COVID-19. It works by teaching your immune system how to fight the virus. After vaccination, your body is better equipped to combat the virus if exposed, reducing your risk of severe illness. It's a key step in controlling the pandemic.

This service was performed 152 times for 151 patients

Fee covid-19 vac 13 res

The "Fee Covid-19 Vac 13 Res" service refers to a charge for the 13th dose of the Covid-19 vaccine, typically for individuals requiring additional doses due to specific health conditions. It's crucial to follow your healthcare provider's advice for your health safety.

This service was performed 1,789 times for 1,785 patients

Fee covid-19 vac 14 res

The "Fee covid-19 vac 14 res" refers to a charge for a specific service related to the COVID-19 vaccine. This could be for administering the vaccine or related care. It's crucial to get vaccinated to protect against the virus. The fee ensures quality service.

This service was performed 1,159 times for 1,154 patients

Influenza vaccine split virus, preservative free

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.

This service was performed 20 times for 20 patients

Influenza vaccine, quadrivalent, preservative free, 0.5 ml dosage

The quadrivalent influenza vaccine is a shot to protect you from four different flu viruses. It's preservative-free and given in a 0.5 ml dose. It helps your body build immunity to the flu, reducing your risk of getting sick.

This service was performed 37 times for 37 patients

Injection, bebtelovimab, 175 mg

Bebtelovimab is a medication given via injection to treat specific viral infections. The 175 mg dosage is administered by a healthcare professional. It works by helping your body's immune system fight off the virus.

This service was performed 209 times for 209 patients

Injection, bebtelovimab, 175 mg

Bebtelovimab is a medication given via injection to treat specific viral infections. The 175 mg dosage is administered by a healthcare professional. It works by helping your body's immune system fight off the virus.

This service was performed 11 times for 11 patients

Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 100 mcg/0.5ml dosage; first dose

This is a COVID-19 vaccine injection, given into a muscle. It's the first dose of a two-dose series. The vaccine, made from mRNA technology, targets the virus's spike protein. It's free of preservatives and each dose contains 100 mcg in a 0.5ml solution.

This service was performed 25 times for 25 patients

Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 100 mcg/0.5ml dosage; second dose

This is your second dose of the COVID-19 vaccine, which is given via a shot into your muscle. The vaccine contains a tiny piece of the coronavirus's spike protein, which helps your body recognize and fight the virus. It's preservative-free and contains 100 mcg in a 0.5ml dose.

This service was performed 27 times for 27 patients

Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, diluent reconstituted; first dose

This is your first dose of a COVID-19 vaccine. It's a shot given in the muscle, usually the arm. The vaccine uses mRNA technology to help your body recognize and fight the virus. It's preservative free and contains 30 mcg in a 0.3ml dose.

This service was performed 64 times for 64 patients

Intramuscular administration of single severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, diluent reconstituted; second dose

This is your second dose of the COVID-19 vaccine, made to protect against severe acute respiratory syndrome coronavirus 2. It's a 30 mcg/0.3ml dose, preservative-free. The vaccine uses mRNA technology to stimulate your immune response. It's injected into a muscle, usually in the arm.

This service was performed 64 times for 62 patients

Intravenous injection, bebtelovimab, includes injection and post administration monitoring

Intravenous injection of Bebtelovimab involves injecting this medication into your vein. It's used to treat specific health conditions. After the injection, your health status will be closely monitored to ensure the medication is working effectively and to check for any side effects.

This service was performed 209 times for 209 patients

Severe acute respiratory syndrome coronavirus 2 (covid-19) vaccine, mrna-lnp, spike protein, preservative free, 30 mcg/0.3ml dosage, diluent reconstituted, for intramuscular use

This is a COVID-19 vaccine that uses mRNA technology to help your body build immunity against the virus. It's given as a 30 mcg dose via a muscle injection. It's free of preservatives and needs to be mixed with a special liquid before use.

This service was performed 13 times for 12 patients

Physician Visit Costs



The typical physician office visit costs for Medicare beneficiaries in this area are: $34.71 for a new patient copayment and $26.42 for an established patient copayment.

The pricing information below displays the copayment minimum, maximum and average amount that patients under Medicare are charged when visiting this provider as a new or established patient. Please keep in mind that these prices are just for reference purposes, and the actual prices charged by the provider might be different.

For patients covered under private health plans the prices below are also useful as healthcare pricing for private insurance is usually established as a function of Medicare prices. Private insurance covered patients should check their individual plans to determine the exact pricing.

The prices below reflect the costs for new and established patients in the 60302 ZIP code area.

New Patients Visit Costs *

The most utilized procedure code for new patients office visits is 99204

  • Average New Patient Price $138.86
  • Minimum New Patient Price $60.08
  • Maximum New Patient Price $183.39
  • Average New Patient Copayment $34.71
  • Minimum New Patient Copayment $15.02
  • Maximum New Patient Copayment $45.84

Established Patients Visit Costs *

The most utilized procedure code for established patients office visits is 99214

  • Average Established Patient Price $105.7
  • Minimum Established Patient Price $18.97
  • Maximum Established Patient Price $148.12
  • Average Established Patient Copayment $26.42
  • Minimum Established Patient Copayment $4.74
  • Maximum Established Patient Copayment $37.03

* The physician office visit costs information is generated by statistical analysis of similar providers in the same geographical area. The pricing information above IS NOT the amount charged by this provider.

Find Provider Hospital Affiliations - Privileges

Doctors and physicians must apply for hospital privileges to treat patients at hospitals. Find out if your doctor has privileges to practice at your preferred hospital by using the hospital affiliation information below based on recent medical claims.

Hospital affiliation is identified through self-reporting data, inpatient, outpatient, physician and ancillary service claims linked by the medical claims NPI number and place of service code. Additionally, to further determine provider hospital affiliation the clinician must have provided services to at least three patients on three different dates in the last 12 months. Dheeraj Mahajan is affiliated with the following medical facilities:

Hospital Name Address Phone Hospital Type Overall Rating
LOYOLA UNIVERSITY MEDICAL CENTER2160 S 1ST AVENUE
MAYWOOD, IL 60153
(708) 216-9000Acute Care Hospitals

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NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1831133693, we treat the final digit (3) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1
1
Doubled → 2
Pos 2
8
Unchanged
Pos 3
3
Doubled → 6
Pos 4
1
Unchanged
Pos 5
1
Doubled → 2
Pos 6
3
Unchanged
Pos 7
3
Doubled → 6
Pos 8
6
Unchanged
Pos 9
9
Doubled → 18 → 1 + 8
Check
3
Target digit
Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 3 → 6 1 → 2 3 → 6 9 → 18 → 9

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 6 + 1 + 2 + 3 + 6 + 6 + 1 + 8 + 24 = 67

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 67 is 70. The difference is the calculated check digit.

70 - 67 = 3
This NPI is valid
The calculated check digit is 3, which matches the last digit of 1831133693.

Other Providers at the Same Location


The following 20 providers are registered at the same or a nearby location.

Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Family)
101 MADISON ST STE 300
OAK PARK, IL 60302
Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Voluntary or Charitable
101 MADISON ST STE 300
OAK PARK, IL 60302
Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Gerontology)
101 MADISON ST STE 300
OAK PARK, IL 60302
Home Health
101 MADISON ST STE 300
OAK PARK, IL 60302
Non-emergency Medical Transport (VAN)
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Psychiatric/Mental Health)
101 MADISON ST STE 300
OAK PARK, IL 60302
Internal Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Adult Health)
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Gerontology)
101 MADISON ST STE 300
OAK PARK, IL 60302
Psychiatry & Neurology (Psychiatry)
101 MADISON ST STE 300
OAK PARK, IL 60302
Rehabilitation Practitioner
101 MADISON ST STE 300
OAK PARK, IL 60302
Physical Medicine & Rehabilitation (Hospice and Palliative Medicine)
101 MADISON ST STE 300
OAK PARK, IL 60302
Family Medicine
101 MADISON ST STE 300
OAK PARK, IL 60302
Nurse Practitioner (Psychiatric/Mental Health)
101 MADISON ST STE 300
OAK PARK, IL 60302
Radiology (Diagnostic Radiology)
101 MADISON ST STE 300
OAK PARK, IL 60302

Frequently Asked Questions

The NPI number assigned to this healthcare provider is 1831133693, enumerated as an "individual" on June 15, 2006.

The provider is located at 101 MADISON ST STE 300 OAK PARK, IL 60302 and the phone number is (708) 486-2700.

Internal Medicine with taxonomy code 207R00000X.

The provider might be accepting Accepts: Ambetter from Home State Health, Ambetter Health,. Please consult your insurance carrier or call the provider to verify.

Dheeraj Mahajan is affiliated with: LOYOLA UNIVERSITY MEDICAL CENTER.