MARK SACK DPM PC – Foot & Ankle Surgery Podiatrist, NPI 1902839194
Foot & Ankle Surgery Podiatrist
Main info
Profile Insights
NPPES metrics only — not quality of care.
Loading map...
Provider Addresses for MARK SACK DPM PC
Northbrook Post Office, 1529, West Dupont Road, Fort Wayne, Allen County, Indiana, 46825, United States
NORTHBROOK, IL 600651262
Phone: (773) 238-7270
Fax: (773) 238-9627
Type: Mailing
3216, West 115th Street, Mount Greenwood, Chicago, Lake Township, Cook County, Illinois, 60655, United States
CHICAGO, IL 606552805
Phone: (773) 238-7270
Fax: (773) 238-9627
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: 2020-06-11
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Past revalidation due date
Earliest CMS due date was 2023-12-31 (891 days ago).
Enrollment records
2
Earliest due date
2023-12-31
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 |
|---|---|---|---|---|
| O20040525000808 | O | Clinic/Group Practice | IL | 2024-07-31 |
| O20200611003256 | O | Physician - Podiatry | IL | 2023-12-31 |
What to do next
- Verify current status on the CMS Revalidation Lookup Tool immediately.
- Complete revalidation in PECOS or contact your Medicare Administrative Contractor (MAC).
- Overdue revalidation can lead to deactivation of Medicare billing privileges.
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.
No Medicare fee-for-service utilization data available for this provider in our database.
Insurance plans in this area (ZIP 60065)
Loading plans...
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.