Are you Dr. Demus? This profile is yours to edit: update your address, phone, photo and services.
Edit this profileWhere to find Mark P. Demus, MD
- Hoffman Estates location main office
1555 Barrington Rd, Hoffman Estates, IL 60169 - Kildeer location
21481 N Rand Rd, Kildeer, IL 60047
About Dr. Demus
Mark P. Demus, MD is a healthcare provider in Hoffman Estates, IL specializing in internal medicine. Mark trained at Northwestern University Feinberg Medical School, graduating in 1981. Mark is also listed as specializing in general acute care hospital and emergency medicine. Medicare claims data shows Mark provided 689 services to 674 patients. The services billed most often include emergency department visit with high level of medical decision making, established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more, and critical care, first 30-74 minutes. This provider record is associated with NPI 1477571479.
Factual summary compiled by Guide.md from public records; not written by this provider.
Education & Training
Specialty
Credentials & Licensing
Medicare information
Exactly as CMS reports it (National Downloadable File, Opt-Out Affidavits, Order & Referring). Not an insurance directory; confirm coverage with the office.
Contact Information
- (847) 490-6930
- Email not available
Practice Locations
1555 BARRINGTON RD
Hoffman Estates, IL 60169
21481 N Rand Rd
Kildeer, IL 60047
Conditions Commonly Evaluated or Treated
Within Internal Medicine generally. Availability varies by clinician, training and location — this profile has not been claimed, so nothing here is a personal claim by the provider.
Conditions
Most searched conditions
- Allergies
- Diabetes
- Flu
- Hypothyroidism
- Strep throat
- UTI
Cardiometabolic
Digestive and liver
Endocrine, blood, and bone
Infectious disease
Kidney and urinary
Respiratory
Blood & Circulation
- Blood clots
Blood disorders
- Anemia
Brain & Nerves
Brain and nerves
- Vertigo
Cardiac and vascular
- AFib
Digestive
Heart & Circulation
- Heart disease
Infections
Kidney & Bladder
Lungs & Breathing
Mental Health
Neurologic and behavioral
Pain
Rheumatologic and pain
Procedures & services
Most searched procedures
- Annual physical
- Blood test
- Flu shot
- Medicare wellness visit
- Sick visit
- TB test
- Well-woman exam
Preventive and evaluation
- Medication management
- Post-hospital transitional care
Screening and diagnostic testing
- EKG
- Spirometry
Bones & Joints
- Trigger Point Injections
Brain and nerves
Cancer screening
- Colon Cancer Screening Referral
- Mammogram Referral
Digestive
Exams & Consultations
- Pre-Op Clearance Exam
Heart & Circulation
- Blood Pressure Check
- Heart monitor
Heart health
- Cardiac Stress Test Referral
Imaging referral
- Abdominal Ultrasound Referral
Immunizations
Lab tests
- Urinalysis
Lungs & Breathing
- At-Home Sleep Study Order
Metabolic & Weight
- Weight Loss Injections and Medication
Minor procedures
- Ingrown toenail removal
- Suture removal
Office procedures
Office Procedures
- Skin Tag and Mole Removal
- Vitamin B12 Injections
- Wart Removal
Pain management
Preventive & Routine Care
- Smoking cessation counseling
Screenings & Diagnostics
- Bone Density Scan Referral
- Diabetes Screening and A1C Test
Sexual health
- STI Testing
Procedures Most Often Billed to Medicare
689 services · 674 patients · 6 distinct codes
| Procedure | Type | Code | Services | Compared with peers |
|---|---|---|---|---|
| Electrocardiogram (ecg) 1 to 3 leads with review by physician only | Treatment | 93042 |
39 | As often as other peers in Internal Medicine |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
304 | More often than most peers in Internal Medicine |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
98 | More often than most peers in Internal Medicine |
| Critical care, first 30-74 minutes | Office visit | 99291 |
92 | More often than most peers in Internal Medicine |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
86 | More often than most peers in Internal Medicine |
| New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more | Office visit | 99203 |
70 | More often than most peers in Internal Medicine |
Source: CMS Medicare public data. Shows how often procedures were billed — not quality of care or patient satisfaction.
Related providers
Connections drawn from the registry and from what providers have told us. A link here is not a referral or an endorsement.
Other internists at this location 1
Same specialty, same street address — most likely the same department or group.
Related specialists at this location 4
Clinically related specialties at the same address — the people this provider most likely works alongside.
Also at this address 4
Providers at the same street address. Each files their own registry entry, so a shared practice often appears under several different names.
More connections — 27 related providers in 4 groups
Other internists in Hoffman Estates 7
Same specialty, same city.
Trained at Northwestern University Feinberg Medical School 8
Other providers in the same specialty who trained at the same institution.
Class of 1981 at Northwestern University Feinberg Medical School 8
Providers who graduated from the same medical school in the same year.
Also performs Electrocardiogram (ecg) 1 to 3 leads with review by physician only 4
Providers in IL who bill this service to Medicare most often.
Common questions
What does Dr. Demus specialize in?
Dr. Demus is an internist in Hoffman Estates, IL. That is the designation recorded for this NPI in the federal registry, where it is listed as “Internal Medicine”.
NPI registry
Where is Dr. Demus located?
Dr. Demus is listed at 1555 Barrington Rd, Hoffman Estates, IL 60169. Addresses come from the NPI registry and can lag a move, so confirm before travelling.
NPI registry
What is Dr. Demus's phone number?
The number on file is (847) 490-6930. Contact the office directly to confirm availability and scheduling.
NPI registry
What is the NPI for Dr. Demus?
Dr. Demus's National Provider Identifier is 1477571479. It is issued by the Centers for Medicare & Medicaid Services and is unique and permanent — it does not change if they move practice.
NPI registry
Where did Dr. Demus go to medical school?
Dr. Demus attended Northwestern University Feinberg Medical School, graduating in 1981. This comes from the CMS National Downloadable File.
CMS public data
How much experience does Dr. Demus have?
Dr. Demus has 45 years experience. Calculated from a graduation year of 1981, reported in the CMS National Downloadable File.
CMS public data
What does Dr. Demus do most often?
According to Medicare billing data, Dr. Demus provides treatments such as electrocardiogram 1 to 3 leads with review by physician only, alongside routine visits and testing. This reflects Medicare patients only and is billing volume, not a measure of quality.
Medicare claims
Is Dr. Demus's profile verified?
Not yet. This profile is built from public federal data and has not been confirmed by Dr. Demus. If this is you, claiming it is free.
Guide.md
Guide.md listings do not constitute medical advice or an endorsement.