Gregory Canfield, M.D., PH.D.
Gregory Canfield, M.D., PH.D. is an Infectious Disease Physician in San Luis Obispo, CA, registered under NPI 1144632159. This provider registers 3 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1428 PHILLIPS LN STE 203, San Luis Obispo, CA 93401. 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 |
|---|---|---|
| A143074 | CA | Critical Care Medicine (Internal… |
| A143074 | CA | Infectious Disease Physician primary |
| A143074 | CA | Internal Medicine Physician |
This provider holds licence A143074 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 - Infectious Disease
- PAC ID
- 8426345869
- Enrollment ID
- I20160928001288
Medicare enrolment is recorded as approved under the provider type Practitioner - Infectious Disease. 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 Infectious Disease covers
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine. NUCC Health Care Provider Taxonomy, code 207RI0200X
All registered taxonomy codes
This provider registers 3 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 207RC0200X | Critical Care Medicine (Internal Medicine) Physician Critical Care Medicine | A143074 | CA | |
| 207RI0200X | Infectious Disease Physician Infectious Disease | A143074 | CA | primary |
| 207R00000X | Internal Medicine Physician | A143074 | CA |
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 | 1144632159 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 25, 2014 |
| Last updated | Oct 16, 2023 |
| Status | Active |
| Sole proprietor | No |
| Gender | Male |
| Credential | M.D., PH.D. |
| Practice address |
1428 PHILLIPS LN STE 203 San Luis Obispo, CA 93401 (805) 543-4407 Fax (805) 543-4587 |
| Mailing address |
PO BOX 1206 Goleta, CA 93116 |
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 | 1 | 4 | 4 | 6 | 3 | 2 | 1 | 5 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 8 | 4 | 3 | 3 | 4 | 1 | 1 |
Sum = 51 · next multiple of 10 = 60 · check digit = 9 · actual last digit = 9
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.