David Kupfer, M.D.
David Kupfer, M.D. is a Surgery of the Hand (Plastic Surgery) Physician in San Diego, CA, registered under NPI 1073533899.
Getting there
The practice address on file is 5395 RUFFIN RD STE 201, San Diego, CA 92123. 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 |
|---|---|---|
| G57621 | CA | Surgery of the Hand (Plastic Surgery)… primary |
This provider holds licence G57621 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 Surgery of the Hand covers
A plastic surgeon with additional training in the investigation, preservation, and restoration by medical, surgical and rehabilitative means of all structures of the upper extremity directly affecting the form and function of the hand and wrist. NUCC Health Care Provider Taxonomy, code 2082S0105X
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 | 1073533899 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Jul 21, 2006 |
| Last updated | Nov 13, 2025 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
5395 RUFFIN RD STE 201 San Diego, CA 92123 (858) 245-9804 Fax (858) 560-1974 |
| Mailing address |
3434 MIDWAY DR SUITE 2004 San Diego, CA 92110 |
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 | 7 | 3 | 5 | 3 | 3 | 8 | 9 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 0 | 5 | 3 | 1 | 3 | 6 | 8 | 9 |
Sum = 61 · next multiple of 10 = 70 · 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.