DR. MARK P DEMUS (MD) – Emergency Medicine Physician, NPI 1477571479
Emergency Medicine Physician
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Profile Insights
NPPES metrics only — not quality of care.
8,824 INTERNAL MEDICINE in IL
Provider Addresses for DR. MARK P DEMUS (MD)
21481 N Rand Rd
Kildeer, IL 600473061
Phone: (847) 618-9500
Fax: (847) 618-9654
Type: Location
Rand Road, Quentin Corners, Kildeer, Ela Township, Lake County, Illinois, 60047, United States
KILDEER, IL 600473061
Phone: (847) 618-9500
Fax: (847) 618-9654
Type: Mailing
Hoffman Estates, Prairie Stone Parkway, Hoffman Estates, Barrington Township, Cook County, Illinois, 60179, United States
HOFFMAN ESTATES, IL 601691019
Phone: (847) 490-6930
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 3 Open Payments records for all available years, with a total value of $75.
Total Amount is formed as General ($75) + Research ($0) + Ownership ($0) = $75.
Last reported payment date: 2024-07-12 • Largest payer in this snapshot: Inari Medical, Inc. ($53).
Total Amount
$75
General + Research + Ownership
Payments
3
Total payment records
General Amount
$75
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-07-12
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Inari Medical, Inc. | $53 |
| Fisher & Paykel Healthcare Inc | $23 |
Medicare Enrollment & Revalidation
Source: CMS public data · Not endorsed by CMS ·
Educational use only—not medical, billing, or legal advice.
PECOS enrollment status
Participating (accepts Medicare assignment)
Enrollment effective: 2004-02-03
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking this Medicare enrollment for revalidation, but has not published a due date.
Enrollment records
1
Earliest due date
Not assigned (TBD)
CMS data updated
2026-06-01
Revalidation progress
- Medicare enrolled
- On CMS revalidation list
- Due date assigned
- Revalidate in PECOS
CMS enrollment records
| Enrollment ID | Type | Specialty | State | Due date |
|---|---|---|---|---|
| I20040203000805 | I | Internal Medicine | IL | TBD |
What to do next
- No action required while the due date shows TBD.
- Check the CMS Revalidation Lookup Tool periodically — CMS updates the list about every 60 days.
- Do not submit a revalidation application in PECOS until CMS publishes a concrete due date.
Prepare CMS-855 application → · Look up this NPI in PECOS → · Verify on CMS PECOS
Medicare Utilization (FFS)
Source: CMS public data · Not endorsed by CMS · Beneficiary counts under 11 are suppressed in source data ·
Educational use only—not medical, billing, or legal advice.
Top Medicare procedures (2023) · refreshed 2026-05-27
| HCPCS | Description | Services | Beneficiaries | Medicare allowed |
|---|---|---|---|---|
| 99285 | Emergency department visit with high level of medical decision making | 302 | 295 | $0 |
| 93042 | Electrocardiogram (ecg) 1 to 3 leads with review by physician only | 120 | 119 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 118 | 116 | $0 |
| 99291 | Critical care, first 30-74 minutes | 110 | 109 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 65 | 63 | $0 |
Insurance plans in this area (ZIP 60047)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| - | IL | |
| E N D O C R I N O L O G Y | IL | |
| N E U R O L O G Y | IL | |
| Hospitalist, Internal Medicine | IL | |
| O P H T H A L M O L O G Y | IL | |
| - | IL | |
| E N D O C R I N O L O G Y | IL | |
| Cardiovascular Disease (Cardiology), Interventional Cardiology | IL | |
| Clinical Social Worker | IL | |
| Certified Nurse Midwife (Cnm) | IL |
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