DR. MARK W STOLAR (M.D.) – Internal Medicine Physician, NPI 1396784591
Internal Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
455 ENDOCRINOLOGY in IL
Provider Addresses for DR. MARK W STOLAR (M.D.)
2507 N RICHMOND RD
MCHENRY, IL 600515407
Phone: (815) 344-2300
Fax: (815) 344-8957
Type: Mailing
3707 DOTY RD STE E&F
WOODSTOCK, IL 600987530
Phone: (815) 338-6600
Fax: (815) 337-1980
Type: Mailing
680 North Lake Shore Drive, 680, North Lake Shore Drive, Streeterville, Near North Side, Chicago, Cook County, Illinois, 60611, United States
SUITE 818
CHICAGO, IL 606114546
Phone: (312) 926-6146
Fax: (312) 926-4398
Type: Mailing
The Corner Bakery, 676, North Saint Clair Street, Streeterville, Near North Side, Chicago, Cook County, Illinois, 60611, United States
SUITE 415
CHICAGO, IL 606112927
Phone: (312) 926-6146
Fax: (312) 926-4398
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
Loading prescription activity...
Open Payments (CMS)
No Open Payments data available for this provider.
This can happen when there are no reportable CMS Open Payments records.
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: 2010-11-19
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 |
|---|---|---|---|---|
| I20101119001127 | 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 |
|---|---|---|---|---|
| 99214 | Established patient office or other outpatient visit, 30-39 minutes | 520 | 397 | $0 |
| G0439 | Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 301 | 301 | $0 |
| 99213 | Established patient office or other outpatient visit, 20-29 minutes | 255 | 203 | $0 |
| 83036 | Hemoglobin a1c level | 141 | 101 | $0 |
| G0008 | Administration of influenza virus vaccine | 85 | 85 | $0 |
Insurance plans in this area (ZIP 60051)
Loading plans...
Group practice members
| Name | Specialty | State |
|---|---|---|
| - | IL | |
| Diagnostic Radiology, Interventional Radiology | IL | |
| Interventional Cardiology, Cardiovascular Disease (Cardiology), Internal Medicine | IL | |
| G A S T R O E N T E R O L O G Y | IL | |
| Anesthesiology, Pain Management | IL | |
| Internal Medicine, Pediatric Medicine | IL | |
| Internal Medicine | IL | |
| Cardiac Electrophysiology, Cardiovascular Disease (Cardiology), Internal Medicine | MN | |
| - | IL | |
| A N E S T H E S I O L O G Y | MI |
Reviews
All reviews are moderated before publication. Reviews reflect users' opinions; we do not verify the accuracy of individual reviews.
No reviews yet. Be the first to share your experience — your opinion helps families compare providers.