Doctor profile · Federal record
Dr. Tammy Chen, MD
Family Medicine Physician (CMS: Family Practice) · Oakland, CA
- NPI 1093887721
- Accepts Medicare
- 44 yrs in practice
- Female
- Group practice
- No sanctions
Practice & contact
- Primary practice
-
818 Webster St
Oakland, CA 946074220
(510) 986-6830
fax (510) 986-6890
Credentials & registration
- NPI registered
- November 2006 — 20 yrs on file
- Profile last updated
- July 8, 2007
- Year of graduation
- 1982 — 44 yrs since
- Specialty taxonomy
- 207Q00000X — NUCC code
- State license (1)
- California #A90848
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1093887721. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
70
Distinct HCPCS
1
Medicare allowed
$1,227
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
93000 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 70 | 68 | $18 |
In context: peer comparison
Among 24 peers in this city , average services per provider: 77. This provider delivers 0.9× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
1,260
Patients
693
Total drug cost
$37,911
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Atorvastatin Calcium | Generic | 142 | 68 | $5,104 |
| Diclofenac Sodium | Generic | 128 | 86 | $6,543 |
| Amlodipine Besylate | Generic | 127 | 59 | $3,612 |
| Losartan Potassium | Generic | 125 | 57 | $4,448 |
| Baclofen | Generic | 114 | 75 | $1,429 |
| Famotidine | Generic | 104 | 61 | $2,323 |
| Lisinopril | Generic | 69 | 33 | $1,353 |
| Gabapentin | Generic | 68 | 36 | $2,180 |
| Metoprolol Succinate | Generic | 64 | 29 | $1,746 |
| Fluticasone Propionate | Generic | 60 | 41 | $1,063 |
Hospital affiliations
Frequently asked questions
What is Dr. Tammy Chen's medical specialty?
Dr. Tammy Chen practices Family Medicine Physician in Oakland, CA.
Where does Dr. Tammy Chen practice?
Dr. Tammy Chen practices at 818 Webster St, Oakland, CA 946074220. Office phone: 5109866830.
What is Dr. Tammy Chen's NPI?
Dr. Tammy Chen's National Provider Identifier (NPI) is 1093887721, issued by NPPES.
Does Dr. Tammy Chen accept Medicare assignment?
Yes. Dr. Tammy Chen accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Tammy Chen commonly perform?
Top Medicare-reported procedures in 2023: Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report (HCPCS 93000). Source: CMS Medicare Physician & Other Practitioners file.