Maung Tin, MD
Maung Tin, MD is a Geriatric Medicine (Internal Medicine) Physician in South San Francisco, CA, registered under NPI 1003015215. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
Here is what surrounds this office in South San Francisco, based on OpenStreetMap data collected Aug 29, 2026. Parking is available about 0.25 mi away. There is EV charging 0.27 mi from the office — useful if you are driving in from out of town. The nearest transit stop is 456 ft away, served by Grand Avenue & Chestnut Avenue. A pharmacy sits 0.41 mi from the entrance (Sunshine Pharmacy), which helps if you leave with a prescription.
Getting here and what is nearby
Transit Grand Avenue & Willow Avenue 336 ft ~2 min
Transit Grand Avenue & Willow Avenue 374 ft ~2 min
Transit Grand Avenue & Chestnut Avenue 456 ft ~2 min
Parking 669 ft ~3 min
Parking 703 ft ~3 min
Parking 0.25 mi ~6 min
Restaurant Round Table Pizza 0.25 mi ~5 min
20 Chestnut Avenue, South San Francisco 94080
Restaurant Wingstop 0.25 mi ~5 min
Restaurant Sourdough & Co. 0.25 mi ~6 min
EV charging 0.27 mi ~6 min
EV charging 0.27 mi ~6 min
Gas station Marathon 0.35 mi ~7 min
Grocery Pacific Supermarket 0.35 mi ~8 min
Pharmacy Sunshine Pharmacy 0.41 mi ~9 min
Distances are straight‑line estimates — walking routes may be longer. Hours and phone numbers can change; call ahead to confirm.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| A105297 | CA | Geriatric Medicine (Internal Medicine)… primary |
This provider holds licence A105297 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Internal Medicine
- PAC ID
- 2466628805
- Enrollment ID
- I20120105000703
Medicare enrolment is recorded as approved under the provider type Practitioner - Internal Medicine. Being enrolled means the provider can bill Medicare; it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Geriatric Medicine covers
An internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes and the hospital. NUCC Health Care Provider Taxonomy, code 207RG0300X
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1003015215 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 17, 2007 |
| Last updated | Dec 6, 2018 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | MD |
| Practice address |
99 OAK AVE APT 217 South San Francisco, CA 94080 (646) 920-7685 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 0 | 0 | 3 | 0 | 1 | 5 | 2 | 1 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 0 | 3 | 0 | 1 | 1 | 2 | 2 |
Sum = 35 · next multiple of 10 = 40 · check digit = 5 · actual last digit = 5
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.