DR. WILLIAM B GREGORY (MD) – Emergency Medicine Physician, NPI 1659337350
Emergency Medicine Physician
Main info
Doctor Profile
Profile Insights
NPPES metrics only — not quality of care.
5,791 EMERGENCY MEDICINE in CA
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Provider Addresses for DR. WILLIAM B GREGORY (MD)
PO BOX 60259
LOS ANGELES, CA 900600259
Phone: (626) 447-0296
Fax: (626) 447-6057
Type: Mailing
Huntington Hospital, 100, West California Boulevard, Pasadena, Los Angeles County, California, 91105, United States
PASADENA, CA 911053010
Phone: (626) 397-3445
Fax: (626) 397-5643
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: 2019-08-23
PECOS data refreshed: 2026-05-27
Medicare revalidation (CMS due date list)
Due date not assigned yet
CMS is tracking 4 Medicare enrollment records; no due dates published yet.
Enrollment records
4
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 |
|---|---|---|---|---|
| I20140602001903 | I | Emergency Medicine | TX | TBD |
| I20161122001877 | I | Emergency Medicine | MD | TBD |
| I20190422000070 | I | Emergency Medicine | SC | TBD |
| I20190823002127 | I | Emergency Medicine | NV | 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 |
|---|---|---|---|---|
| 99284 | Emergency department visit with moderate level of medical decision making | 84 | 84 | $0 |
| 99285 | Emergency department visit with high level of medical decision making | 44 | 43 | $0 |
| 93010 | Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 18 | 16 | $0 |
Insurance plans in this area (ZIP 90060)
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Provider's Procedures
| Specialty | Practice State | HCPCS Code | Description | Service Count | Beneficiary Count |
|---|---|---|---|---|---|
| EMERGENCY MEDICINE | CA | 71010 | X-ray of chest, 1 view, front | 12 | 12 |
Group practice members
| Name | Specialty | State |
|---|---|---|
| Emergency Medicine | TX | |
| Emergency Medicine | TX | |
| Emergency Medicine | NC | |
| Emergency Medicine | TX | |
| Emergency Medicine | CO | |
| Emergency Medicine | NC | |
| Emergency Medicine | TX | |
| Family Practice | TX | |
| Internal Medicine | TX | |
| Hospitalist, Family Practice | TX |
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