DAVID C. KLONOFF, M.D., INC.
DAVID C. KLONOFF, M.D., INC. is an organization registered with the National Plan and Provider Enumeration System (NPPES) under NPI 1174763866, based in Foster City, CA. It is classified under Medical Specialty Clinic/Center.
Getting there
The practice address on file is 1157 CHESS DR STE 100, Foster City, CA 94404. 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 |
|---|---|---|
| G35726 | CA | Medical Specialty Clinic/Center primary |
This provider holds licence G35726 issued in CA. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
This NPI does not appear in the PECOS Medicare enrolment file. Providers who do not bill Medicare — or who bill only through a group's enrolment — will not appear here. It is not a sign of any problem with the registration.
What Medical Specialty covers
An entity, facility, or distinct part of a facility providing diagnostic, treatment, and prescriptive services related to a specific area of medical specialization. Frequently used for Title V related Children's Specialty services or to meet specific public health needs (e.g., infectious diseases or breast and cervical cancer). NUCC Health Care Provider Taxonomy, code 261QM2500X
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-2 identifies an organization — a clinic, hospital, group practice, laboratory, or supplier. Individual clinicians working there hold their own NPI-1 numbers separately, so a bill may reference both.
| NPI | 1174763866 valid check digit |
|---|---|
| Entity type | Organization (NPI-2) |
| Enumeration date | Feb 20, 2009 |
| Last updated | Feb 20, 2009 |
| Status | Active |
| Practice address |
1157 CHESS DR STE 100 Foster City, CA 94404 (650) 357-7140 Fax (650) 349-6497 |
| Mailing address |
1720 EL CAMINO REAL STE 130 Burlingame, CA 94010 |
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 | 7 | 4 | 7 | 6 | 3 | 8 | 6 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 5 | 4 | 5 | 6 | 6 | 8 | 3 |
Sum = 64 · next multiple of 10 = 70 · check digit = 6 · actual last digit = 6
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.