Doctor profile · Federal record
Dr. Andrew Williamson
Emergency Medicine Physician (CMS: Emergency Medicine) · San Diego, CA
- NPI 1437579422
- Accepts Medicare
- 12 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
7901 Frost St
San Diego, CA 92123
(858) 939-3400
Credentials & registration
- NPI registered
- April 2014 — 12 yrs on file
- Profile last updated
- May 24, 2018
- Year of graduation
- 2014 — 12 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #A144673
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1437579422. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
243
Distinct HCPCS
4
Medicare allowed
$29,817
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 111 | 110 | $177 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 80 | 67 | $8 | |
99291 |
Critical care, first 30-74 minutes | 33 | 33 | $217 | |
99284 |
Emergency department visit with moderate level of medical decision making | 19 | 19 | $122 |
In context: peer comparison
Among 130 peers in this city , average services per provider: 67. This provider delivers 3.6× the peer median.Open Payments
Industry payments received
All-time total
$141
Transactions
1
Manufacturers
1
| Payer (manufacturer) | Industry | Txns | Amount |
|---|---|---|---|
| Inari Medical, Inc. | 1 | $140.86 |
By nature of payment
Medicare Part D · 2023
Top prescriptions
Total claims
179
Patients
179
Total drug cost
$1,096
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Ibuprofen | Generic | 55 | 55 | $158 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 21 | 21 | $67 |
| Ondansetron Odt (Ondansetron) | Brand | 20 | 20 | $150 |
| Doxycycline Monohydrate | Generic | 19 | 19 | $256 |
| Prednisone | Generic | 17 | 17 | $57 |
| Cephalexin | Generic | 13 | 13 | $127 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 12 | 12 | $117 |
| Cefuroxime (Cefuroxime Axetil) | Brand | 11 | 11 | $128 |
| Famotidine | Generic | 11 | 11 | $37 |
Hospital affiliations
Frequently asked questions
What is Dr. Andrew Williamson's medical specialty?
Dr. Andrew Williamson practices Emergency Medicine Physician in San Diego, CA.
Where does Dr. Andrew Williamson practice?
Dr. Andrew Williamson practices at 7901 Frost St, San Diego, CA 92123. Office phone: 8589393400.
What is Dr. Andrew Williamson's NPI?
Dr. Andrew Williamson's National Provider Identifier (NPI) is 1437579422, issued by NPPES.
Does Dr. Andrew Williamson accept Medicare assignment?
Yes. Dr. Andrew Williamson accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Andrew Williamson commonly perform?
Top Medicare-reported procedures in 2023: 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); Critical care (HCPCS 99291). Source: CMS Medicare Physician & Other Practitioners file.