Physician Profile
Unclaimed ProfileAbout DEMUS
Mark P Demus, MD is a healthcare provider in Hoffman Estates, IL specialising in internal medicine. Mark trained at Northwestern University Feinberg Medical School, graduating in 1981. Mark is also listed as specialising in general acute care hospital and emergency medicine.
Summarised automatically from public NPI registry and CMS Medicare data. Not written or reviewed by this provider. Claim this profile to replace it.
Education & Training
Areas of Expertise
Common questions
What does Dr. Demus specialise in?
Dr. Demus is an internal medicine in Hoffman Estates, IL. This is the primary taxonomy recorded against the NPI in the federal registry, listed there 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. Guide.md cannot book appointments or pass on messages — please call the office directly.
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
Licensing & Certification
Source: NPPES NPI Registry
Contact Information
- (847) 490-6930
- Email not available
Practice Locations
1555 BARRINGTON RD
Hoffman Estates, IL 60169
Procedures Most Often Billed to Medicare
689 services · 674 patients · 6 distinct codes
| Procedure | Type | Code | Services |
|---|---|---|---|
| Electrocardiogram (ecg) 1 to 3 leads with review by physician only | Treatment | 93042 |
39 |
| Emergency department visit with high level of medical decision making | Office visit | 99285 |
304 |
| Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more | Office visit | 99213 |
98 |
| Critical care, first 30-74 minutes | Office visit | 99291 |
92 |
| Emergency department visit with moderate level of medical decision making | Office visit | 99284 |
86 |
| 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 |
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 internal medicines 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 — 31 related providers in 4 groups
Other internal medicines 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 8
Providers in IL who bill this service to Medicare most often.
Provider data sourced from the NPPES NPI Registry and CMS public datasets. Information is provided for reference and is not medical advice.