GUY ELGAR MD
NPI 1851194914
Thoracic Surgery (Cardiothoracic Vascular Surgery) in Sacramento, CA

Q: What is the provider's specialty?

The provider's specialty is Thoracic Surgery (Cardiothoracic Vascular Surgery) with taxonomy code 208G00000X.

NPI Status: Active since March 31, 2025

Contact Information

4610 X ST STE 4202
SACRAMENTO, CA
ZIP 95817
Phone: (408) 636-3857

NPPES record last updated: March 31, 2025. Verified against the NPPES registry weekly; last sync: July 12, 2026.

Table of Contents

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

Individual
Male
Thoracic Surgery (Cardiothoracic Vascula...

About GUY ELGAR

This page provides the complete NPI Profile along with additional information for Guy Elgar, a provider established in Sacramento, California with a medical specialization in Thoracic Surgery (cardiothoracic Vascular Surgery). The healthcare provider is registered in the NPI registry with number 1851194914 assigned on March 2025. The practitioner's primary taxonomy code is 208G00000X with license number 749356237 (NY). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1851194914
Provider Name: GUY ELGAR MD
Gender: Male
Entity Type: Individual
Location Address: 4610 X ST STE 4202 SACRAMENTO, CA 95817
Location Phone: (408) 636-3857
Mailing Address: 1519 ORIOLE AVE SUNNYVALE, CA 94087
Mailing Phone: (408) 636-3857
Is Sole Proprietor?: No
Enumeration Date: 03-31-2025
Last Update Date: 03-31-2025
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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: Thoracic Surgery (Cardiothoracic Vascular Surgery)
Taxonomy Code: 208G00000X
Type: Allopathic & Osteopathic Physicians
License No.: 749356237
License State: NY
Taxonomy Description: A thoracic surgeon provides the operative, perioperative and critical care of patients with pathologic conditions within the chest. Included is the surgical care of coronary artery disease, cancers of the lung, esophagus and chest wall, abnormalities of the trachea, abnormalities of the great vessels and heart valves, congenital anomalies, tumors of the mediastinum and diseases of the diaphragm. The management of the airway and injuries of the chest is within the scope of the specialty.

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 1851194914, we treat the final digit (4) 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 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).

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 → 2

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 2

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 1 → 2 4 → 8 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 1 + 0 + 1 + 2 + 9 + 8 + 9 + 2 + 24 = 66

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

The next multiple of ten after 66 is 70. The difference is the calculated check digit.

70 - 66 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1851194914.