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MICHAEL HEFFERNAN
NPI 1891374906
Internal Medicine in Chicago, IL

Active since April 06, 2021PECOS Enrolled
1620 W HARRISON ST, CHICAGO, IL 60612(312) 942-7100 Get Directions Write a Review

NPPES record last updated: June 18, 2021. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Jun 18, 2021, Apr 6, 2021 (2 updates tracked since 2021).

About Michael Heffernan NPPES

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

MICHAEL HEFFERNAN (NPI 1891374906) is an individual internal medicine provider in Chicago, Illinois, licensed in Illinois (125.078139) and active in the NPI registry since April 2021. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1891374906
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMICHAEL HEFFERNAN
Location Address1620 W HARRISON STChicago, IL 60612-3801
Mailing Address1620 W Harrison StChicago, IL 60612-3801
Phone(312) 942-7100
Sole ProprietorYes
Enumeration DateApril 6, 2021
Last NPPES UpdateJune 18, 20212 updates tracked since enumeration
NPPES CertifiedJune 18, 2021
✔ NPI 1891374906 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in IL · 125.078139
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 ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
1620 W HARRISON ST, Chicago, IL 60612
Open in Google Maps ↗

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Michael Heffernan is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

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

2

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

Rush University Medical Center
Same address
Diagnostic Radiology
1620 W HARRISON ST
Chicago, IL 60612
  • Reassigned Medicare billing, Illinois enrollment
  • Medicare enrollment name: Rush University Medical Group
  • 2,169 clinicians in this Medicare group
NPI 1184269425 (312) 563-4270
Rush Oak Park Physicians Group Adult Medicine
7.0 mi
Adult Medicine
610 S MAPLE AVE, SUITE 4600
Oak Park, IL 60304
  • Reassigned Medicare billing, Illinois enrollment
  • 51 clinicians in this Medicare group
NPI 1548531924 (708) 660-2240

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 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.

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.
32 services17 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
15 services15 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.
15 services15 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60612 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.

NICHOLAS RIGLER
Internal Medicine
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
KABEER RAJAN MASIH MD
Radiology (Vascular & Interventional Radiology)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
MARGARET C SCHERMERHORN MD
Obstetrics & Gynecology
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
ANDREW MAX MELCHIORIS MD, MBA
Internal Medicine
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (314) 942-5000
NICOLE HALEY SULIMA DNP
Nurse Practitioner (Gerontology)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
KRINA PATEL MD
Psychiatry & Neurology (Psychiatry)
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
LAYNE MITCHELL BESSA
Registered Nurse
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5000
COLETTE MITCHELL OT
Occupational Therapist
1620 W HARRISON ST
CHICAGO, IL 60612
Cook County (312) 942-5800

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 Michael Heffernan's NPI number?

The NPI number for Michael Heffernan is 1891374906. It was assigned to this individual provider in the NPPES registry on April 6, 2021.

Where is Michael Heffernan located?

Michael Heffernan practices at 1620 W Harrison St, Chicago, IL 60612. The listed phone number is (312) 942-7100.

What is Michael Heffernan's specialty?

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

Is Michael Heffernan enrolled in Medicare?

Yes. Michael Heffernan is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Michael Heffernan's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Michael Heffernan reassigns Medicare benefits to 2 organizations: Rush University Medical Center (Chicago, IL) and Rush Oak Park Physicians Group Adult Medicine (Oak Park, IL). Each 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 Michael Heffernan's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Michael Heffernan was last updated on June 18, 2021. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 5 years 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.