Bryan Gammon, M.D.
Bryan Gammon, M.D. is a Dermatopathology Physician in San Jose, CA, registered under NPI 1518134154. This provider registers 2 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 2420 SAMARITAN DR, San Jose, CA 95124. 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 |
|---|---|---|
| A118101 | CA | Dermatopathology Physician primary |
| R0862 | TX | Dermatology Physician |
Licences are recorded in 2 states: CA, TX. Providers licensed in several states often practise near a state border or deliver telehealth across state lines.
- Status
- Approved
- Provider type
- Practitioner - Dermatology
- PAC ID
- 0547413189
Enrolled in Medicare 5 times, across 5 states:
| State | Enrollment ID | Provider type |
|---|---|---|
| California | I20130110000543 | Practitioner - Dermatology |
| Texas | I20200728001579 | Practitioner - Dermatology |
| Arizona | I20251027001936 | Practitioner - Dermatology |
| Illinois | I20260616004359 | Practitioner - Pathology |
| New York | I20260625004379 | Practitioner - Pathology |
Medicare enrolment is recorded as approved under the provider type Practitioner - Dermatology. There are 5 separate enrolment records across 5 states (CA, TX, AZ, IL, NY). Multiple enrolments usually mean the provider bills Medicare from more than one practice location, or has kept an earlier enrolment after moving. Each record carries its own enrolment ID, listed above. 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 Texas. The practice address on file is in San Jose, 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
- A118101
- Specialty
- Dermatopathology Physician
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 Dermatopathology covers
A dermatopathologist has the expertise to diagnose and monitor diseases of the skin including infectious, immunologic, degenerative and neoplastic diseases. This entails the examination and interpretation of specially prepared tissue sections, cellular scrapings and smears of skin lesions by means of routine and special (electron and fluorescent) microscopes. NUCC Health Care Provider Taxonomy, code 207ND0900X
All registered taxonomy codes
This provider registers 2 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207ND0900X | Dermatopathology Physician Dermatopathology | A118101 | CA | primary |
| 207N00000X | Dermatology Physician | R0862 | TX |
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 | 1518134154 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 13, 2008 |
| Last updated | Jun 11, 2026 |
| Status | Active |
| Sole proprietor | Yes |
| Gender | Male |
| Credential | M.D. |
| Practice address |
2420 SAMARITAN DR San Jose, CA 95124 (408) 369-5600 Fax (408) 369-5625 |
| Mailing address |
4131 DIRECTORS ROW Houston, TX 77092 |
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 | 5 | 1 | 8 | 1 | 3 | 4 | 1 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 2 | 8 | 2 | 3 | 8 | 1 | 1 |
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.