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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. MARK STEVEN REITER M.D.
NPI 1902864408
Internal Medicine in Oak Lawn, IL

Active since May 03, 2006
4400 W 95TH ST, OAK LAWN, IL 60453(708) 499-2323(708) 499-2324 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Jul 13, 2026, Sep 11, 2025 (2 updates tracked since 2025).

About Dr. Mark Steven Reiter M.d. NPPES

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

DR. MARK STEVEN REITER M.D. (NPI 1902864408) is an individual internal medicine provider in Oak Lawn, Illinois and active in the NPI registry since May 2006.

NPPES Registry Identity

NPI1902864408
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. MARK STEVEN REITERCredential: M.D.
Location Address4400 W 95TH STOak Lawn, IL 60453-2654
Mailing Address4400 W 95th StOak Lawn, IL 60453-2654 · (708) 499-2323 · Fax (708) 499-2324
Phone(708) 499-2323
Fax(708) 499-2324
Sole ProprietorNo
Enumeration DateMay 3, 2006
Last NPPES UpdateJuly 13, 20262 updates tracked since enumeration
✔ NPI 1902864408 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
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.
Also ListedInternal Medicine · Geriatric MedicineTaxonomy 207RG0300X
4400 W 95TH ST, Oak Lawn, IL 60453
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Areas of Expertise CMS Part B claims 3

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.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
110 services62 patients
Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215
This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.
42 services31 patients
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit G0439
An annual wellness visit is a yearly appointment with your primary care provider to create or update a personalized prevention plan. This plan helps prevent illness based on your current health and risk factors. It's a subsequent visit, meaning it follows an initial assessment.
12 services12 patients

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.

RONALD MYINT M.D.
Internal Medicine
4400 W 95TH ST, SUITE 311
OAK LAWN, IL 60453
Cook County (708) 424-9710
MS. JANINE ROSE ROSENBERG M.S., C.G.C.
Genetic Counselor, MS
4400 W 95TH ST, PHYSICIANS' PAVILLION SUITE 207
OAK LAWN, IL 60453
Cook County (708) 684-1564
MISS JACQUELINE ROSE ZDON PA-C
Physician Assistant (Surgical)
4400 W 95TH ST, SUITE 205
OAK LAWN, IL 60453
Cook County (708) 346-4040
JOHN LOUIS ANCONA PA
Physician Assistant
4400 W 95TH ST, SUITE 205
OAK LAWN, IL 60453
Cook County (630) 977-9764
MARK S. REITER, M.D., S.C.
Clinic/Center
4400 W 95TH ST, SUITE 405
OAK LAWN, IL 60453
Cook County (708) 499-2323
ARIHA SHAH
Psychologist
4400 W 95TH ST
OAK LAWN, IL 60453
Cook County (708) 684-5832
MRS. ANNE ZIELLNSKI SCHAIBLE MD
Obstetrics & Gynecology
4400 W 95TH ST, STE 403
OAK LAWN, IL 60453
Cook County (708) 422-3984
DR. JOEL ROY GUILLORY JR. M. D.
Thoracic Surgery (Cardiothoracic Vascular Surgery)
4400 W 95TH ST, STE 205
OAK LAWN, IL 60453
Cook County (708) 346-4040

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Mark Reiter's NPI number?

The NPI number for Mark Reiter is 1902864408. It was assigned to this individual provider in the NPPES registry on May 3, 2006.

Where is Mark Reiter located?

Mark Reiter practices at 4400 W 95th St, Oak Lawn, IL 60453. The listed phone number is (708) 499-2323.

What is Mark Reiter's specialty?

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

When was this NPI record last updated?

The NPPES record for Mark Reiter was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 33 days 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.