Doctor profile · Federal record
Dr. Mai-Sie Chan, MD
Internal Medicine Physician (CMS: Internal Medicine) · San Francisco, CA
- NPI 1326136557
- Accepts Medicare
- 25 yrs in practice
- Female
- Solo practice
- No sanctions
Practice & contact
- Primary practice
-
929 Clay St, Suite 303
San Francisco, CA 941081556
(415) 956-6633
fax (415) 956-6638
Credentials & registration
- NPI registered
- October 2006 — 20 yrs on file
- Profile last updated
- February 14, 2023
- Year of graduation
- 2001 — 25 yrs since
- Specialty taxonomy
- 207R00000X — NUCC code
- State license (1)
- California #A83362
- Medicaid
- CA #00A833620
Federal sanctions & exclusions
No sanctions, exclusions or revocations on file
Checked against OIG LEIE on NPI 1326136557. Last verified May 11, 2026.Medicare procedures · 2023
Top services delivered
Total services
771
Distinct HCPCS
9
Medicare allowed
$89,437
| HCPCS | Description | Services | Patients | Avg allowed | |
|---|---|---|---|---|---|
99214 |
Established patient office or other outpatient visit, 30-39 minutes | 390 | 138 | $145 | |
G0439 |
Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit | 101 | 101 | $157 | |
99213 |
Established patient office or other outpatient visit, 20-29 minutes | 87 | 57 | $89 | |
G0008 |
Administration of influenza virus vaccine | 68 | 68 | $37 | |
90662 |
Influenza vaccine split virus, preservative free | 58 | 58 | $72 | |
93000 |
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report | 22 | 20 | $18 | |
99442 |
Telephone medical discussion with physician, 11-20 minutes | 19 | 15 | $75 | |
99441 |
Telephone medical discussion with physician, 5-10 minutes | 15 | 11 | $40 | |
90686 |
Influenza vaccine, quadrivalent, preservative free, 0.5 ml dosage | 11 | 11 | $22 |
In context: peer comparison
Among 236 peers in this city , average services per provider: 93. This provider delivers 8.3× the peer median.Medicare Part D · 2023
Top prescriptions
Total claims
2,829
Patients
811
Total drug cost
$205,400
| Drug | Type | Claims | Patients | Total cost |
|---|---|---|---|---|
| Losartan Potassium | Generic | 511 | 138 | $10,493 |
| Amlodipine Besylate | Generic | 472 | 130 | $7,915 |
| Atorvastatin Calcium | Generic | 454 | 130 | $8,699 |
| Metformin Hcl | Generic | 188 | 51 | $3,036 |
| Metoprolol Succinate | Generic | 168 | 46 | $3,615 |
| Omeprazole | Generic | 136 | 48 | $2,045 |
| Simvastatin | Generic | 134 | 36 | $2,773 |
| Hydrochlorothiazide | Generic | 121 | 31 | $1,440 |
| Lisinopril | Generic | 96 | 27 | $1,511 |
| Diclofenac Sodium | Generic | 94 | 46 | $3,570 |
Hospital affiliations
Frequently asked questions
What is Dr. Mai-Sie Chan's medical specialty?
Dr. Mai-Sie Chan practices Internal Medicine Physician in San Francisco, CA.
Where does Dr. Mai-Sie Chan practice?
Dr. Mai-Sie Chan practices at 929 Clay St, San Francisco, CA 941081556. Office phone: 4159566633.
What is Dr. Mai-Sie Chan's NPI?
Dr. Mai-Sie Chan's National Provider Identifier (NPI) is 1326136557, issued by NPPES.
Does Dr. Mai-Sie Chan accept Medicare assignment?
Yes. Dr. Mai-Sie Chan accepts Medicare assignment, meaning Medicare-allowed amounts are accepted as full payment for covered services.
What procedures does Dr. Mai-Sie Chan commonly perform?
Top Medicare-reported procedures in 2023: Established patient office or other outpatient visit (HCPCS 99214); Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit (HCPCS G0439); Established patient office or other outpatient visit (HCPCS 99213). Source: CMS Medicare Physician & Other Practitioners file.