MARC BULLOCK CCDS
NPI 1558290130
Specialist/Technologist Cardiovascular in Palo Alto, CA

NPI Status: Active since May 18, 2026

Contact Information

87 ENCINA AVE
PALO ALTO, CA
ZIP 94301
Phone: (707) 290-6960

NPI Profile Information
Primary Taxonomy
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Specialist/Technologist Cardiovascular

About MARC BULLOCK

This page provides the complete NPI Profile along with additional information for Marc Bullock, a provider established in Palo Alto, California with a medical specialization in Specialist/technologist Cardiovascular. The healthcare provider is registered in the NPI registry with number 1558290130 assigned on May 2026. The practitioner's primary taxonomy code is 246X00000X. The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1558290130
Provider Name: MARC BULLOCK CCDS
Gender: Male
Entity Type: Individual
Location Address: 87 ENCINA AVE PALO ALTO, CA 94301
Location Phone: (707) 290-6960
Mailing Address: 87 ENCINA AVE PALO ALTO, CA 94301
Mailing Phone: (707) 290-6960
Is Sole Proprietor?: No
Enumeration Date: 05-18-2026
Last Update Date: 05-18-2026
Code Navigator

Location Map

Specialty - Primary Taxonomy

The NPI enumerator requires providers to submit at least one taxonomy code. A taxonomy code is a unique 10-character code that describes the healthcare provider type, classification, and the area of specialization. There could be only one primary taxonomy code per NPI record. For individual NPIs the license data is associated to the taxonomy code.

Classification: Specialist/Technologist Cardiovascular
Taxonomy Code: 246X00000X
Type: Technologists, Technicians & Other Technical Service Providers
Taxonomy Description: 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

NPI NPI Number Validation

How NPI Validation Works

The NPI validation process uses the ISO-standard Luhn algorithm, a mathematical "handshake", to ensure that a provider's 10-digit ID is authentic and free of common typing errors.

To verify the NPI 1558290130, we treat the final digit (0) as the Check Digit—the target answer we need to reach. The process begins by taking the first nine digits and adding a constant value of 24, which accounts for the "80840" prefix required for all U.S. health identifiers. We then double every other digit starting from the right and sum the individual digits of those results together. For this specific NPI, that total comes to 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

Digit-by-digit view

Use the first nine digits for the calculation. Starting from the right, double every other digit. The last digit is the check digit and is not part of the calculation.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 4

Pos 6

Unchanged

Pos 7

Doubled → 0

Pos 8

Unchanged

Pos 9

Doubled → 6

Check

Target digit

Regular digit Doubled digit Check digit

Step 1: Double every other digit from the right

Starting with the rightmost digit of the first nine digits, double every other value. If doubling creates a two-digit number, add those digits together.

1 → 2 5 → 10 → 1 2 → 4 0 → 0 3 → 6

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 5 + 1 + 0 + 8 + 4 + 9 + 0 + 1 + 6 + 24 = 60

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 60 is 60. The difference is the calculated check digit.

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1558290130.