1. Home
  2. Directory
  3. Illinois
  4. Chicago
  5. Internal Medicine
  6. NPI Profile

NATALIE REIZINE M.D.
NPI 1194106724
Internal Medicine - Medical Oncology in Chicago, IL

Active since June 09, 2015PECOS EnrolledAccepts Medicare Assignment
87.08/100
CMS Quality Rating
5841 S MARYLAND AVE # MC3051, CHICAGO, IL 60637(773) 702-6840(773) 702-2230 Get Directions Write a Review

NPPES record last updated: March 14, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Natalie Reizine M.d. NPPES

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

NATALIE REIZINE M.D. (NPI 1194106724) is an individual medical oncology provider in Chicago, Illinois, licensed in Illinois (036146006) and active in the NPI registry since June 2015. She is enrolled in Medicare PECOS, is affiliated with University Of Illinois Hospital And Clinics, and maintains a secondary practice location in Chicago.

NPPES Registry Identity

NPI1194106724
Entity TypeIndividualFemale
Primary Taxonomy207RX0202X
Provider Legal NameNATALIE REIZINECredential: M.D.
Location Address5841 S MARYLAND AVE # MC3051Chicago, IL 60637-1447
Mailing Address5841 S Maryland Ave # Mc3051Chicago, IL 60637-1447 · (773) 702-6840 · Fax (773) 702-2230
Phone(773) 702-6840
Fax(773) 702-2230
Sole ProprietorNo
Medical School CMSLoyola University Of Chicago, Stritch School Of MedicineGraduated 2015
Enumeration DateJune 9, 2015
Last NPPES UpdateMarch 14, 2025
NPPES CertifiedMarch 14, 2025
✔ NPI 1194106724 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · Medical OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RX0202X
License✔ Licensed in IL · 036146006
Definition
An internist who specializes in the diagnosis and treatment of all types of cancer and other benign and malignant tumors. This specialist decides on and administers therapy for these malignancies as well as consults with surgeons and radiotherapists on other treatments for cancer.
Also ListedInternal MedicineTaxonomy 207R00000X · License 036146006 (IL)
5841 S MARYLAND AVE # MC3051, Chicago, IL 60637
Open in Google Maps ↗

Secondary Practice Location 1

Location 11801 W Taylor StChicago, IL 60612-4795 · Phone (312) 355-1625

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

Natalie Reizine 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 ID3274846498
PECOS Enrollment IDI20210809003860
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 Reassignment

Medicare enrollment records show Natalie Reizine reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

The Board Of Trustees Of The University Of Illinois
2.1 mi
Federally Qualified Health Center (FQHC)
6835 S NORMAL BLVD
Chicago, IL 60621
  • Reassigned Medicare billing, Illinois enrollment
  • 2,127 clinicians in this Medicare group
NPI 1427600345 (312) 355-5801

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 4

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
64 services17 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.
32 services19 patients
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.
31 services20 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
15 services15 patients

Hospital Affiliations CMS Care Compare

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

University Of Illinois Hospital And Clinics

Acute Care Hospitals · Chicago, IL
2/5 CMS rating
OwnershipGovernment - State
CMS Certification Number140150
Location1740 West Taylor St Suite 1400Chicago, IL 60612 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60637 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
$183.39 typical visit price
range $60.08 – $183.39
Typical copayment $45.84 (range $15.02 – $45.84)
Most-billed visit code 99205
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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

87.08/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality70.79
Promoting Interoperability100
Improvement Activities40
Cost52.82

Other Providers at the Same Location NPPES 2

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

JENNA MICHELE MARK
Nurse Practitioner (Acute Care)
5841 S MARYLAND AVE # MC3051
CHICAGO, IL 60637
Cook County (773) 219-2011
KRIYA PATEL
Internal Medicine
5841 S MARYLAND AVE # MC3051
CHICAGO, IL 60637
Cook County (773) 702-6840

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 Natalie Reizine's NPI number?

The NPI number for Natalie Reizine is 1194106724. It was assigned to this individual provider in the NPPES registry on June 9, 2015.

Where is Natalie Reizine located?

Natalie Reizine practices at 5841 S Maryland Ave # Mc3051, Chicago, IL 60637. The listed phone number is (773) 702-6840.

What is Natalie Reizine's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Medical Oncology, with taxonomy code 207RX0202X.

Is Natalie Reizine enrolled in Medicare?

Yes. Natalie Reizine is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Natalie Reizine's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Natalie Reizine reassigns Medicare benefits to The Board Of Trustees Of The University Of Illinois (Chicago, IL). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Natalie Reizine's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Natalie Reizine affiliated with any hospitals?

According to CMS data, Natalie Reizine is affiliated with University Of Illinois Hospital And Clinics.

When was this NPI record last updated?

The NPPES record for Natalie Reizine was last updated on March 14, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 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.