Dr. Mark P Demus , MD
Emergency Medicine • Hoffman Estates, IL
1555 Barrington Rd
Hoffman Estates, IL 601691019
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on July 17, 2006; this date does not establish years in practice.
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Published CMS data list 689 Original Medicare Part B services in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Published rows only; this is not a quality measure.
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Published Part B service records, 2024:
- 99285 — Emergency department visit with high level of medical decision making: 304 service units.
- 99213 — Established patient outpatient office visit: 98 service units.
- 99291 — Critical care: 92 service units.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Units differ by code; these are not visits or a measure of quality.
CPT® only copyright 2023 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2024). CPT notice
See all 6 records in the table · Guide: How to read Medicare Part B data
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Published CMS data list 238 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) — 42 prescription fills, including refills.
- Cephalexin — 34 prescription fills, including refills.
- Methylprednisolone — 34 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 9 records in the table · Guide: How to read Medicare Part D prescriber data
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More Medicare Part B services than 85% of clinicians listed under Emergency Medicine in Illinois (2024, 2,100 clinicians with data). Median for this group: 321. Middle half: 179 to 524.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 676 in 2020 to 689 in 2024.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2020–2024.
Practice Location & Contact Primary Location
1555 Barrington Rd
Hoffman Estates, IL 601691019
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
NPPES lists 1 additional practice-address record in Kildeer, IL. See the list
Source: CMS NPPES NPI Registry, practice location records; release date unavailable.
CMS Doctors and Clinicians lists 2 distinct group names: Cepamerica Illinois Llp; Endeavor Health Medical Group. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Northwestern University Feinberg Medical School
1981
What Public CMS Data Show
Emergency Medicine: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare patients
639 people with Original Medicare in 2024
It gives a sense of how many people with Medicare this clinician treated that year.
Source: CMS, Medicare Physician & Other Practitioners – by Provider, 2024.
Medicare-allowed amount
About $106,637 in 2024
The total amount Medicare approved for these services in 2024. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
Paid by Medicare
About $83,545 in 2024
The part of the Medicare-allowed amount that Medicare itself paid in 2024, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners – by Provider and Service, 2024.
30-day fills
238 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$1,536 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers – by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $18.39 in 2024
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2024.
Years since graduation
45 years (graduated 1981)
CMS Doctors and Clinicians data list 1981 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2006
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, “Does your provider accept Medicare as full payment?”
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Demus has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Demus as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Hoffman Estates and Illinois
Billing and prescribing volume is not a quality rating.
Medicare Part B services
More Medicare Part B services than 85% of clinicians listed under Emergency Medicine in Illinois (2024, 2,100 clinicians with data). Median for this group: 321. Middle half: 179 to 524.
Too few clinicians listed under Emergency Medicine in Hoffman Estates have Medicare Part B data for 2024 to compare.
Medicare-allowed amount
A higher Medicare-allowed amount than 90% of clinicians listed under Emergency Medicine in Illinois (2024, 2,100 clinicians with data). Median for this group: $45,108. Middle half: $24,677 to $72,172.
Too few clinicians listed under Emergency Medicine in Hoffman Estates have Medicare Part B data for 2024 to compare.
Paid by Medicare
A higher Medicare payment amount than 90% of clinicians listed under Emergency Medicine in Illinois (2024, 2,100 clinicians with data). Median for this group: $34,329. Middle half: $18,565 to $55,341.
Too few clinicians listed under Emergency Medicine in Hoffman Estates have Medicare Part B data for 2024 to compare.
Medicare Part D prescriptions
More Part D prescriptions than 85% of clinicians listed under Emergency Medicine in Illinois (2024, 1,650 clinicians with data). Median for this group: 80. Middle half: 32 to 154.
Too few clinicians listed under Emergency Medicine in Hoffman Estates have Medicare Part D data for 2024 to compare.
Part D drug cost
A higher Part D drug cost than 85% of clinicians listed under Emergency Medicine in Illinois (2024, 1,650 clinicians with data). Median for this group: $440. Middle half: $171 to $1,010.
Too few clinicians listed under Emergency Medicine in Hoffman Estates have Medicare Part D data for 2024 to compare.
9 active clinicians are listed under Emergency Medicine with a practice address in Hoffman Estates, IL (3,297 in Illinois).
Addresses are self-reported to NPPES and may be out of date.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services varied from year to year: 676 in 2020 and 689 in 2024.
- 2020: 676
- 2021: 882
- 2022: 954
- 2023: 772
- 2024: 689
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Medicare-allowed amount
Medicare-allowed amount decreased 10% from $117,898 in 2020 to $106,637 in 2024.
- 2020: $117,898
- 2021: $130,683
- 2022: $139,068
- 2023: $112,192
- 2024: $106,637
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Paid by Medicare
Paid by Medicare decreased 11% from $94,086 in 2020 to $83,545 in 2024.
- 2020: $94,086
- 2021: $107,037
- 2022: $118,758
- 2023: $87,866
- 2024: $83,545
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Medicare Part D prescriptions
Medicare Part D prescriptions increased 109% from 114 in 2020 to 238 in 2024.
- 2020: 114
- 2021: 123
- 2022: 218
- 2023: 211
- 2024: 238
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30-day fills
30-day fills increased 109% from 114 in 2020 to 238 in 2024.
- 2020: 114
- 2021: 123
- 2022: 218
- 2023: 211
- 2024: 238
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Part D drug cost
Part D drug cost went from $784 in 2020 to $1,536 in 2024.
- 2020: $784
- 2021: $936
- 2022: $1,344
- 2023: $1,770
- 2024: $1,536
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Industry payments (Open Payments)
Industry payments (Open Payments) went from $56.88 in 2023 to $18.39 in 2024.
- 2023: $56.88
- 2024: $18.39
Sources: CMS Medicare Physician & Other Practitioners (2024), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2024), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo · Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2024 (payments made January 1 – December 31, 2024): fewer than 11 records totaling $18.39.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| Inari Medical, Inc. |
Food and Beverage
In-kind items and services
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FLOWTRIEVER CATHETER, S | General | $18.39 |
Source: CMS Open Payments, program year 2024, released June 30, 2026.
Performed Procedures & Service Volume
CPT® is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016–2023 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners – by Provider and Service data, 2017–2024; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99285
Emergency department visit with high level of medical decision making
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304 | 293 | $1225.02 | $187.73 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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98 | 97 | $175.00 | $95.18 |
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99291
Critical care, first 30-74 minutes
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92 | 91 | $1612.00 | $222.67 |
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99284
Emergency department visit with moderate level of medical decision making
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86 | 84 | $833.47 | $129.68 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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70 | 70 | $242.00 | $118.96 |
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93042
Electrocardiogram (ecg) 1 to 3 leads with review by physician only
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39 | 39 | $53.00 | $7.02 |
Source: CMS Part B by Provider and Service, 2024; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 42 | 169 | $204.10 | 42 |
| Cephalexin | Cephalexin | 34 | 278 | $200.52 | 34 |
| Methylprednisolone | Methylprednisolone | 34 | 211 | $200.95 | 34 |
| Tramadol Hcl | Tramadol Hcl | 33 | 126 | $100.52 | 33 |
| Cefdinir | Cefdinir | 32 | 277 | $442.81 | 32 |
| Doxycycline Hyclate | Doxycycline Hyclate | 23 | 213 | $211.88 | 23 |
| Amoxicillin | Amoxicillin | 14 | 119 | $66.95 | 14 |
| Azithromycin | Azithromycin | 14 | 70 | $55.28 | 14 |
| Ondansetron Odt | Ondansetron | 12 | 43 | $53.30 | 12 |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
Self-certified to NPPES: 2021-04-28NUCC Taxonomy Code: 207P00000X
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.
NUCC Taxonomy Code: 282N00000X
An acute general hospital is an institution whose primary function is to provide inpatient diagnostic and therapeutic services for a variety of medical conditions, both surgical and non-surgical, to a wide population group. The hospital treats patients in an acute phase of illness or injury, characterized by a single episode or a fairly short duration, from which the patient returns to his or her normal or previous level of activity.
NUCC Taxonomy Code: 282N00000X
An acute general hospital is an institution whose primary function is to provide inpatient diagnostic and therapeutic services for a variety of medical conditions, both surgical and non-surgical, to a wide population group. The hospital treats patients in an acute phase of illness or injury, characterized by a single episode or a fairly short duration, from which the patient returns to his or her normal or previous level of activity.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - INTERNAL MEDICINE
I20040203000805
IL
7012800188
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Endeavor Health Medical Group
21481 N Rand Rd, Kildeer, IL 600473061
Phone: 8476189696
Endeavor Health Medical Group
455 S Roselle Rd, Schaumburg, IL 601932971
Phone: 8479850600
Cepamerica Illinois Llp
1555 Barrington Rd, Hoffman Estates, IL 601691019
Phone: 8478432000
Endeavor Health Medical Group
199 W Rand Rd, Mount Prospect, IL 600561151
Phone: 8476185400
Endeavor Health Medical Group
21481 N Rand Rd, Kildeer, IL 600473061
Phone: 8478667846
Endeavor Health Medical Group
1450 Busch Pkwy, Buffalo Grove, IL 600894541
Phone: 8477258640
Endeavor Health Medical Group
2650 Ridge Ave, Evanston, IL 602011700
Secondary Practice Locations
21481 N Rand Rd
Kildeer, IL 600473061
Phone: 8476189500
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Nurse Practitioner
Family Nurse Practitioner
Emergency Medicine
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Emergency Medicine (license number reported to NPPES: IL 036-065552)
Registered at 21481 N RAND RD, KILDEER, IL 600473061 (Tel: 8476189500)
General Acute Care Hospital
NPI status registered as active in NPPES database
Registered at 1555 BARRINGTON RD, HOFFMAN ESTATES, IL 601691019 (Tel: 8474906930)
Registered at 800 W CENTRAL RD, ARLINGTON HEIGHTS, IL 600052349 (Tel: (847) 618-4000)
Recorded as MARK DEMUS, MD
Emergency Medicine (license number reported to NPPES: IL 036-065552)
NPI status registered as active in NPPES database
Registered at 800 W CENTRAL RD, ARLINGTON HEIGHTS, IL 600052349 (Tel: 8476184000)
Registered at 800 W CENTRAL RD, ARLINGTON HEIGHTS, IL 600052349 (Tel: 8476184000)
Recorded as MARK DEMUS, MD
General Acute Care Hospital
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Emergency Medicine Providers in Hoffman Estates
- Dr. Nitin Soorya, MD
- Dr. Rema Johnson, DO
- Dr. John Sullivan, DO
- Dr. Mohammed Sabit, MBBS
- Dr. Michael Frumkin, MD
Mailing Address
21481 N Rand Rd
Kildeer, IL 600473061
Phone: 8476189500