DR. JOHN ELLIS JR. WILLIAMSON (D.O.) – Emergency Medical Services (Emergency Medicine) Physician, NPI 1629017108
Emergency Medical Services (Emergency Medicine) Physician
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NPPES metrics only — not quality of care.
2,845 EMERGENCY MEDICINE in IL
Provider Addresses for DR. JOHN ELLIS JR. WILLIAMSON (D.O.)
405 W Jackson St
Carbondale, IL 629011462
Phone: (618) 549-0721
Type: Location
201 S 14th St
Herrin, IL 629483631
Phone: (618) 942-2171
Type: Location
2 S Hospital Dr
Murphysboro, IL 629663333
Phone: (618) 684-3156
Type: Location
1000 Health Center Dr
Mattoon, IL 619384644
Phone: (217) 258-2551
Fax: (217) 258-2256
Type: Location
Emerald Avenue, Deer Chase Estates, Orland Park, Orland Township, Cook County, Illinois, 60467, United States
ORLAND PARK, IL 604679013
Phone: (708) 364-1253
Type: Mailing
Morris Hospital, 150, West High Street, Morris, Grundy County, Illinois, 60450, United States
MORRIS, IL 604501463
Phone: (815) 942-2932
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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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: 2007-07-13
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 2 Medicare enrollment records; no due dates published yet.
Enrollment records
2
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 |
|---|---|---|---|---|
| I20040818000363 | I | Emergency Medicine | IN | TBD |
| I20070713000171 | I | Emergency 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 | 374 | 344 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 314 | 282 | $0 |
| 99291 | Critical care, first 30-74 minutes | 69 | 67 | $0 |
| 99283 | Emergency department visit with low level of medical decision making | 32 | 31 | $0 |
Insurance plans in this area (ZIP 62901)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | IL | |
| Emergency Medicine | PA | |
| - | IL | |
| Emergency Medicine | IL | |
| Emergency Medicine | IL | |
| Emergency Medicine, Internal Medicine | IL | |
| Emergency Medicine | IL | |
| Emergency Medicine | IL | |
| Emergency Medicine | IL | |
| Nurse Practitioner | IL |
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