DR. ARIEL REUVEN KATZ M.D.
NPI 1245261684
Internal Medicine in Chicago, IL

Q: What is Ariel Katz's NPI number?

The NPI number for Ariel Katz is 1245261684. It was assigned to this individual provider in the NPPES registry on July 5, 2006.

Q: What is Ariel Katz'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 Ariel Katz was last updated on January 29, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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 July 05, 2006PECOS EnrolledAccepts Medicare Assignment

3134 N CLARK ST, CHICAGO, IL 60657(312) 296-5090 Get Directions Write a Review

NPPES record last updated: January 29, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jul 3, 2023, Apr 25, 2022, Feb 3, 2020 and 1 more (4 updates tracked since 2020).

On this page

About Dr. Ariel Reuven Katz M.d. NPPES

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

DR. ARIEL REUVEN KATZ M.D. (NPI 1245261684) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (036-114147) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Northshore University Healthsystem - Evanston Hospital, and is a graduate of Rush Medical College Of Rush University (2001).

NPPES Registry Identity

NPI1245261684

Entity TypeIndividualMale

Primary Taxonomy207R00000X

Provider Legal NameDR. ARIEL REUVEN KATZCredential: M.D.

Location Address3134 N CLARK STChicago, IL 60657-4414

Mailing Address29373 Network PlChicago, IL 60673-1293 · (847) 390-5900

Phone(312) 296-5090

Sole ProprietorNo

Medical School CMSRush Medical College Of Rush UniversityGraduated 2001

Enumeration DateJuly 5, 2006

Last NPPES UpdateJanuary 29, 20254 updates tracked since enumeration

NPPES CertifiedJanuary 29, 2025

✔ NPI 1245261684 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

License✔ Licensed in IL · 036-114147

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.

3134 N CLARK ST, Chicago, IL 60657

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Accepted Insurance

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

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Ariel Reuven Katz 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 ID6608856752

PECOS Enrollment IDI20070927000376

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.

Medicare Billing Reassignments

Medicare enrollment records show Ariel Katz reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Advocate Health And Hospitals Corp.

1.0 mi

Cardiovascular Disease

3118 N ASHLAND AVE
Chicago, IL 60657

Reassigned Medicare billing, Illinois enrollment
4,870 clinicians in this Medicare group

NPI 1487951711 (773) 880-9722

Endeavor Health Medical Group

8.8 mi

Allergy & Immunology

1000 CENTRAL ST
Evanston, IL 60201

Reassigned Medicare billing, Illinois enrollment
4,841 clinicians in this Medicare group

NPI 1497701882 (847) 570-5235

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 11

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.

87 services64 patients

Insertion of needle into vein for collection of blood sample 36415

This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.

64 services54 patients

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213

This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.

62 services56 patients

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232

Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.

58 services36 patients

Hospital discharge day management, more than 30 minutes 99239

Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.

40 services36 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.

38 services38 patients

Hospital Affiliations CMS Care Compare 3

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

Northshore University Healthsystem - Evanston Hospital

Acute Care Hospitals · Evanston, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Other

CMS Certification Number140010

Location2650 Ridge AveEvanston, IL 60201 · Cook County

Emergency services Birthing friendly

Advocate Illinois Masonic Medical Center

Acute Care Hospitals · Chicago, IL

3/5 CMS rating

OwnershipVoluntary non-profit - Private

CMS Certification Number140182

Location836 West Wellington AvenueChicago, IL 60657 · Cook County

Emergency services Birthing friendly

Advocate Lutheran General Hospital

Acute Care Hospitals · Park Ridge, IL

5/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number140223

Location1775 Dempster StPark Ridge, IL 60068 · Cook County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60657 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.

DR. SORIN C DANCIU M.D.

Internal Medicine (Cardiovascular Disease)