Doctor profile · Federal record
Dr. Mason Shieh, M.D., M.B.A.
Emergency Medicine Physician (CMS: Emergency Medicine) · Los Alamitos, CA
- NPI 1467718486
- Accepts Medicare
- MIPS 86.3 / 100 · 2023
- 14 yrs in practice
- Male
- Group practice
- No sanctions
Practice & contact
Operates at 2 locations .
- Primary practice
-
3751 Katella Ave
Los Alamitos, CA 907203113
(714) 456-8888 - Additional location
-
1115 S Sunset Ave
West Covina, CA 917903940
(626) 962-4011 - Mailing address
-
1115 S Sunset Ave
West Covina, CA 917903940
Credentials & registration
- NPI registered
- April 2012 — 14 yrs on file
- Profile last updated
- April 2, 2025
- Year of graduation
- 2012 — 14 yrs since
- Specialty taxonomy
- 207P00000X — NUCC code
- State license (1)
- California #A134394
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1467718486. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
350
Distinct HCPCS
4
Medicare allowed
$50,905
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99285 |
Emergency department visit with high level of medical decision making | 160 | 157 | $184 | |
93010 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only | 72 | 68 | $9 | |
99284 |
Emergency department visit with moderate level of medical decision making | 59 | 58 | $127 | |
99291 |
Critical care, first 30-74 minutes | 59 | 58 | $226 |
In context: peer comparison
Among 10 peers in Los Alamitos Emergency Medicine Physician, average services per provider: 84. This provider delivers 4.2× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
197
Patients
193
Total drug cost
$1,290
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Cephalexin | Generic | 48 | 48 | $362 |
| Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) | Brand | 34 | 34 | $146 |
| Ondansetron Odt (Ondansetron) | Brand | 31 | 31 | $297 |
| Amoxicillin-Clavulanate Potass (Amoxicillin/Potassium Clav) | Brand | 18 | 16 | $205 |
| Meclizine Hcl | Generic | 17 | 17 | $59 |
| Prednisone | Generic | 14 | 13 | $44 |
| Metronidazole | Generic | 12 | 11 | $114 |
| Tramadol Hcl | Generic | 12 | 12 | $24 |
| Acetaminophen-Codeine (Acetaminophen With Codeine) | Brand | 11 | 11 | $38 |
Hospital affiliations
Frequently asked questions
What is Dr. Mason Shieh's medical specialty?
Dr. Mason Shieh practices Emergency Medicine Physician in Los Alamitos, CA.
Where does Dr. Mason Shieh practice?
Dr. Mason Shieh practices at 3751 Katella Ave, Los Alamitos, CA 907203113. Office phone: 7144568888.
What is Dr. Mason Shieh's NPI?
Dr. Mason Shieh's National Provider Identifier (NPI) is 1467718486, issued by NPPES.
Does Dr. Mason Shieh accept Medicare assignment?
Yes. Dr. Mason Shieh accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mason Shieh 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); Emergency department visit with moderate level of medical decision making (HCPCS 99284). Source: CMS Medicare Physician & Other Practitioners file.