DR. LEIGH C CHAO (MD) – Emergency Medicine Physician, NPI 1922081348
Emergency Medicine Physician
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Doctor Profile
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Profile Insights
NPPES metrics only — not quality of care.
2,845 EMERGENCY MEDICINE in IL
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Provider Addresses for DR. LEIGH C CHAO (MD)
OSF Saint Anthony's Health Center, 1, St Anthonys Way, Alton, Madison County, Illinois, 62002, United States
ST. ANTHONY'S HEALTH CENTER
ALTON, IL 620024568
Phone: (618) 465-2571
Type: Location
1516, Merganser Boulevard, Swansea, Saint Clair County, Illinois, 62226, United States
SWANSEA, IL 622268539
Phone:
Type: Mailing
PO BOX 7412011
CHICAGO, IL 606742011
Phone: (314) 362-9123
Fax: (314) 747-9160
Type: Mailing
11133 DUNN RD
DEPT EMERGENCY MED
SAINT LOUIS, MO 631366163
Phone: (314) 362-9123
Fax: (314) 747-9160
Type: Location
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 2 Open Payments records for all available years, with a total value of $57.
Total Amount is formed as General ($57) + Research ($0) + Ownership ($0) = $57.
Last reported payment date: 2023-10-27 • Largest payer in this snapshot: Janssen Pharmaceuticals, Inc ($57).
Total Amount
$57
General + Research + Ownership
Payments
2
Total payment records
General Amount
$57
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2023-10-27
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Janssen Pharmaceuticals, Inc | $57 |
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: 2007-07-18
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 |
|---|---|---|---|---|
| I20040611001414 | I | Internal Medicine | IL | TBD |
| I20070718000036 | I | Emergency Medicine | MO | 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 | 78 | 75 | $0 |
| 99291 | Critical care, first 30-74 minutes | 76 | 76 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 45 | 44 | $0 |
Insurance plans in this area (ZIP 62002)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Certified Registered Nurse Anesthetist (Crna) | MO | |
| Certified Registered Nurse Anesthetist (Crna) | IL | |
| Family Practice, Geriatric Medicine | IL | |
| Certified Registered Nurse Anesthetist (Crna) | IL | |
| Family Practice | IL | |
| Nurse Practitioner | IL | |
| Certified Registered Nurse Anesthetist (Crna) | IL | |
| Family Practice | IL | |
| Physician Assistant | IL | |
| Cardiovascular Disease (Cardiology) | MO |
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