Doctor profile · Federal record
Dr. William Gregory, MD
Emergency Medicine Physician (CMS: Emergency Medicine) · Pasadena, CA
- NPI 1659337350
- Accepts Medicare
- 27 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
100 W California Blvd
Pasadena, CA 911053010
(626) 397-3445
fax (626) 397-5643 - Mailing address
-
Po Box 60259
Los Angeles, CA 900600259
Credentials & registration
- NPI registered
- April 2006 — 20 yrs on file
- Profile last updated
- June 13, 2008
- Year of graduation
- 1999 — 27 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #A78714
- Medicaid
- CA #OOA787140
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1659337350. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
146
Distinct HCPCS
3
Medicare allowed
$17,826
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99284 |
Emergency department visit with moderate level of medical decision making | 84 | 84 | $120 | |
99285 |
Emergency department visit with high level of medical decision making | 44 | 43 | $174 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 18 | 16 | $8 |
In context: peer comparison
Among 18 peers in this city , average services per provider: 68. This provider delivers 2.1× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
52
Patients
50
Total drug cost
$685
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Prednisone | Generic | 21 | 21 | $40 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 17 | 17 | $249 |
| Albuterol Sulfate Hfa (Albuterol Sulfate) | Brand | 14 | 12 | $396 |
Frequently asked questions
What is Dr. William Gregory's medical specialty?
Dr. William Gregory practices Emergency Medicine Physician in Pasadena, CA.
Where does Dr. William Gregory practice?
Dr. William Gregory practices at 100 W California Blvd, Pasadena, CA 911053010. Office phone: 6263973445.
What is Dr. William Gregory's NPI?
Dr. William Gregory's National Provider Identifier (NPI) is 1659337350, issued by NPPES.
Does Dr. William Gregory accept Medicare assignment?
Yes. Dr. William Gregory accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. William Gregory commonly perform?
Top Medicare-reported procedures in 2023: Emergency department visit with moderate level of medical decision making (HCPCS 99284); Emergency department visit with high level of medical decision making (HCPCS 99285); Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only (HCPCS 93010). Source: CMS Medicare Physician & Other Practitioners file.