DR. ANDREW RIGGAN WILLIAMS (M.D.) – Emergency Medicine Physician, NPI 1275988156
Emergency Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
4,917 EMERGENCY MEDICINE in NY
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Provider Addresses for DR. ANDREW RIGGAN WILLIAMS (M.D.)
550 VANDERBILT AVE APT 805
BROOKLYN, NY 112385086
Phone: (847) 612-0729
Type: Mailing
Mount Sinai Brooklyn, 3201, Kings Highway, Flatlands, Brooklyn, Kings County, New York, 11234, United States
BROOKLYN, NY 112342625
Phone: (718) 252-3000
Type: Location
3 ERIE CT
OAK PARK, IL 603022519
Phone: (708) 763-6747
Type: Mailing
NPPES updates history
No NPPES updates recorded for this provider.
Prescription Activity
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Open Payments (CMS)
CMS reports 1 Open Payments records for all available years, with a total value of $23.
Total Amount is formed as General ($23) + Research ($0) + Ownership ($0) = $23.
Last reported payment date: 2024-08-05 • Largest payer in this snapshot: Janssen Pharmaceuticals, Inc ($23).
Total Amount
$23
General + Research + Ownership
Payments
1
Total payment records
General Amount
$23
General payments
Research Amount
$0
Research funding
Ownership Amount
$0
Ownership interests
Ownership Count
0
Ownership records
Last Payment Date
2024-08-05
Latest reported date
Top Companies
Largest payers in this snapshot
| Company | Amount |
|---|---|
| Janssen Pharmaceuticals, 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: 2025-10-23
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 |
|---|---|---|---|---|
| I20220224001133 | I | Emergency Medicine | IL | TBD |
| I20251023003917 | I | Emergency Medicine | WI | 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 | 132 | 128 | $0 |
| 99284 | Emergency department visit with moderate level of medical decision making | 20 | 20 | $0 |
| 99291 | Critical care, first 30-74 minutes | 15 | 15 | $0 |
Insurance plans in this area (ZIP 11238)
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Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | IL | |
| Emergency Medicine | CA | |
| - | IL | |
| Emergency Medicine | IL | |
| Nurse Practitioner | IL | |
| Emergency Medicine | IL | |
| Physician Assistant | IL | |
| Nurse Practitioner | IL | |
| Emergency Medicine | IL | |
| Emergency Medicine | IL |
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