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DR. MARK P DEMUS MD
NPI 1477571479
Emergency Medicine in Hoffman Estates, IL

Active since July 17, 2006PECOS EnrolledAccepts Medicare Assignment
100/100
CMS Quality Rating
1555 BARRINGTON RD, HOFFMAN ESTATES, IL 60169(847) 490-6930 Get Directions Write a Review

NPPES record last updated: April 28, 2021. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Apr 28, 2021, Mar 5, 2020, Mar 17, 2018 and 1 more (4 updates tracked since 2017).

About Dr. Mark P Demus Md NPPES

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

DR. MARK P DEMUS MD (NPI 1477571479) is an individual emergency medicine provider in Hoffman Estates, Illinois, licensed in Illinois (036-065552) and active in the NPI registry since July 2006. He is enrolled in Medicare PECOS, is affiliated with Northwest Community Hospital 1, and maintains a secondary practice location in Kildeer.

NPPES Registry Identity

NPI1477571479
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. MARK P DEMUSCredential: MD
Location Address1555 BARRINGTON RDHoffman Estates, IL 60169-1019
Mailing Address21481 N Rand RdKildeer, IL 60047-3061 · (847) 618-9500 · Fax (847) 618-9654
Phone(847) 490-6930
Sole ProprietorYes
Medical School CMSNorthwestern University Feinberg Medical SchoolGraduated 1981
Enumeration DateJuly 17, 2006
Last NPPES UpdateApril 28, 20214 updates tracked since enumeration
NPPES CertifiedApril 28, 2021
✔ NPI 1477571479 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in IL · 036-065552
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
Also ListedGeneral Acute Care HospitalTaxonomy 282N00000X · License 036065552 (IL)
1555 BARRINGTON RD, Hoffman Estates, IL 60169
Open in Google Maps ↗

Secondary Practice Location 1

Location 121481 N Rand RdKildeer, IL 60047-3061 · Phone (847) 618-9500 · Fax (847) 618-9654

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter Health, Ambetter Health of Delaware.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. Mark P Demus Md 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 ID7012800188
PECOS Enrollment IDI20040203000805
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

3

Medicare enrollment records show Mark Demus reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Cepamerica Illinois LLP
Same address
Emergency Medicine
1555 BARRINGTON RD
Hoffman Estates, IL 60169
  • Reassigned Medicare billing, Illinois enrollment
  • 982 clinicians in this Medicare group
NPI 1447873740 (847) 843-2000
Northwest Community Health Services Inc
6.8 mi
Internal Medicine
3040 W SALT CREEK LN
Arlington Heights, IL 60005
  • Reassigned Medicare billing, Illinois enrollment
  • 346 clinicians in this Medicare group
NPI 1134433154 (847) 618-3481
Endeavor Health Medical Group
23 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 6

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
304 services293 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.
98 services97 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
92 services91 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
86 services84 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
70 services70 patients
Electrocardiogram (ecg) 1 to 3 leads with review by physician only 93042
An Electrocardiogram (ECG) is a non-invasive test that records the electrical activity of your heart. 1 to 3 leads or sensors are placed on your body to capture this data. A physician then reviews the results to evaluate your heart's health.
39 services39 patients

Hospital Affiliations CMS Care Compare 2

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

Northwest Community Hospital 1

Acute Care Hospitals · Arlington Heights, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number140252
Location800 W Central RoadArlington Heights, IL 60005 · Cook County
Emergency services Birthing friendly

St Alexius Medical Center

Acute Care Hospitals · Hoffman Estates, IL
4/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number140290
Location1555 N Barrington RdHoffman Estates, IL 60169 · Cook County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 60169 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
$94.06 typical visit price
range $60.08 – $183.39
Typical copayment $23.51 (range $15.02 – $45.84)
Most-billed visit code 99203
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.

100/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality100
Improvement Activities40
Cost94.69

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.

A.R. ZAND, M.D., S.C.
Pediatrics
1555 BARRINGTON RD, SUITE 320
HOFFMAN ESTATES, IL 60169
Cook County (847) 882-2600
JANE M. VODVARKA CRNA
Nurse Anesthetist, Certified Registered
1555 BARRINGTON RD
HOFFMAN ESTATES, IL 60169
Cook County (847) 490-2923
SHANTHI ARIBINDI M.D.
Anesthesiology
1555 BARRINGTON RD
HOFFMAN ESTATES, IL 60169
Cook County (847) 490-2923
SONAL N. PATEL M.D.
Anesthesiology
1555 BARRINGTON RD
HOFFMAN ESTATES, IL 60169
Cook County (847) 490-2923
EDWARD L. SCHULTE D.O
Anesthesiology
1555 BARRINGTON RD
HOFFMAN ESTATES, IL 60169
Cook County (847) 490-2923
LEAH NICOLE TREFFEISEN DO
Obstetrics & Gynecology
1555 BARRINGTON RD, OBSTETRICS AND GYNECOLOGY RESIDENCY PROGRAM
HOFFMAN ESTATES, IL 60169
Cook County (224) 299-6939
ALEXANDER FOROWYCZ M.D.
Anesthesiology
1555 BARRINGTON RD
HOFFMAN ESTATES, IL 60169
Cook County (847) 490-2923
NORTHWEST HEALTH CARE ASSOCIATES
Internal Medicine
1555 BARRINGTON RD, SUITE 2300A
HOFFMAN ESTATES, IL 60169
Cook County (847) 843-7030

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 Demus's NPI number?

The NPI number for Mark Demus is 1477571479. It was assigned to this individual provider in the NPPES registry on July 17, 2006.

Where is Mark Demus located?

Mark Demus practices at 1555 Barrington Rd, Hoffman Estates, IL 60169. The listed phone number is (847) 490-6930.

What is Mark Demus's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Mark Demus enrolled in Medicare?

Yes. Mark Demus 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 organizations bill Medicare for Mark Demus's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Demus reassigns Medicare benefits to 3 organizations: Cepamerica Illinois LLP (Hoffman Estates, IL), Northwest Community Health Services Inc (Arlington Heights, IL) and Endeavor Health Medical Group (Evanston, 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 Mark Demus's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Mark Demus accept?

Health plans from Ambetter Health and Ambetter Health of Delaware list Mark Demus as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Mark Demus affiliated with any hospitals?

According to CMS data, Mark Demus is affiliated with Northwest Community Hospital 1 and St Alexius Medical Center.

When was this NPI record last updated?

The NPPES record for Mark Demus was last updated on April 28, 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.