David Lam, MD, DDS, PHD
David Lam, MD, DDS, PHD is a provider specialising in Oral & Maxillofacial Surgery (D.M.D.) in San Francisco, CA, registered under NPI 1902132244. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty. NPPES records them as a sole proprietor, meaning the practice is not incorporated as a separate legal entity.
Getting there
The practice address on file is 155 FIFTH STREET DEPARTMENT OF ORAL AND MAXILLOFACIAL SURGERY, San Francisco, CA 94103. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| 107193 | CA | Oral & Maxillofacial Surgery (D.M.D.) primary |
| 059354 | NY | Oral and Maxillofacial Surgery (Dentist) |
| 107193 | CA | Oral and Maxillofacial Surgery (Dentist) |
| 059354 | NY | Specialist |
| 107193 | CA | Specialist |
| 059354 | NY | Oral & Maxillofacial Surgery (D.M.D.) |
Licences are recorded in 2 states: CA, NY. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Oral Surgery
- PAC ID
- 2264798800
- Enrollment ID
- I20221209002241
Medicare enrolment is recorded as approved under the provider type Practitioner - Oral Surgery. 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.
Licensed in 2 states
This provider holds licences in 2 states: California and New York. The practice address on file is in San Francisco, CA, but a licence in another state usually means they see patients there too — either at a second location or by telehealth. If the address above is far from you, it is worth calling to ask whether they practise closer to where you live.
- Licence
- 107193
- Specialty
- Oral & Maxillofacial Surgery (D.M.D.)
- Licence
- 059354
- Specialty
- Oral and Maxillofacial Surgery (Dentist)
Licence numbers are self-reported to NPPES at registration. They do not confirm a licence is currently active, in good standing, or valid for the specialty shown — only the state board can tell you that, which is why we link to each one.
What Oral & Maxillofacial Surgery covers
Oral and maxillofacial surgeons are trained to recognize and treat a wide spectrum of diseases, injuries and defects in the head, neck, face, jaws and the hard and soft tissues of the oral and maxillofacial region. They are also trained to administer anesthesia, and provide care in an office setting. They are trained to treat problems such as the extraction of wisdom teeth, misaligned jaws, tumors and cysts of the jaw and mouth, and to perform dental implant surgery. NUCC Health Care Provider Taxonomy, code 204E00000X
All registered taxonomy codes
This provider registers 6 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 204E00000X | Oral & Maxillofacial Surgery (D.M.D.) | 107193 | CA | primary |
| 1223S0112X | Oral and Maxillofacial Surgery (Dentist) Oral and Maxillofacial Surgery | 059354 | NY | |
| 1223S0112X | Oral and Maxillofacial Surgery (Dentist) Oral and Maxillofacial Surgery | 107193 | CA | |
| 174400000X | Specialist | 059354 | NY | |
| 174400000X | Specialist | 107193 | CA | |
| 204E00000X | Oral & Maxillofacial Surgery (D.M.D.) | 059354 | NY |
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 | 1902132244 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Oct 21, 2009 |
| Last updated | Dec 16, 2021 |
| Status | Active |
| Sole proprietor | Yes |
| Credential | MD, DDS, PHD |
| Practice address |
155 FIFTH STREET DEPARTMENT OF ORAL AND MAXILLOFACIAL SURGERY San Francisco, CA 94103 (631) 416-0363 |
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 | 9 | 0 | 2 | 1 | 3 | 2 | 2 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 9 | 0 | 2 | 2 | 3 | 4 | 2 | 8 |
Sum = 56 · next multiple of 10 = 60 · check digit = 4 · actual last digit = 4
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.