Marc Bullock, CCDS
Marc Bullock, CCDS is a Cardiovascular Specialist/Technologist in Palo Alto, CA, registered under NPI 1558290130.
Getting there
The practice address on file is 87 ENCINA AVE, Palo Alto, CA 94301. 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
NPPES does not list a state licence number for this record. That is not unusual — organizations and some provider types are not required to file one. Verify current licensure with the relevant state board before care.
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 Specialist/Technologist Cardiovascular covers
An allied health professional who performs diagnostic examinations at the request or direction of a physician in one or more of the following three areas: invasive cardiology, noninvasive cardiology, and noninvasive peripheral vascular study. Cardiovascular technologists are one type of allied health professional for which the Committee on Allied Health Education and Accreditation has accredited education programs NUCC Health Care Provider Taxonomy, code 246X00000X
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 | 1558290130 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | May 18, 2026 |
| Last updated | May 18, 2026 |
| Status | Active |
| Sole proprietor | No |
| Credential | CCDS |
| Practice address |
87 ENCINA AVE Palo Alto, CA 94301 (707) 290-6960 |
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 | 5 | 8 | 2 | 9 | 0 | 1 | 3 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 5 | 1 | 8 | 4 | 9 | 0 | 1 | 6 |
Sum = 60 · next multiple of 10 = 60 · check digit = 0 · actual last digit = 0
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.