XIAOFEI YU MD
NPI 1417741661
Otolaryngology in San Francisco, CA

NPI Status: Active since April 04, 2025

Contact Information

2233 POST ST FL 3
SAN FRANCISCO, CA
ZIP 94115
Phone: (408) 242-8170

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

Individual
Female
Otolaryngology

About XIAOFEI YU

This page provides the complete NPI Profile along with additional information for Xiaofei Yu, a provider established in San Francisco, California with a medical specialization in Otolaryngology. The healthcare provider is registered in the NPI registry with number 1417741661 assigned on April 2025. The practitioner's primary taxonomy code is 207Y00000X with license number 390200000X (CA). The provider is registered as an individual and her NPI record was last updated one year ago.

NPI: 1417741661
Provider Name: XIAOFEI YU MD
Other Name: SOPHIE YU MD
Other Name Type: Other Name (5)
Gender: Female
Entity Type: Individual
Location Address: 2233 POST ST FL 3 SAN FRANCISCO, CA 94115
Location Phone: (408) 242-8170
Mailing Address: 2233 POST ST FL 3 SAN FRANCISCO, CA 94115
Mailing Phone: (408) 242-8170
Is Sole Proprietor?: Yes
Enumeration Date: 04-04-2025
Last Update Date: 04-04-2025
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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: Otolaryngology
Taxonomy Code: 207Y00000X
Type: Allopathic & Osteopathic Physicians
License No.: 390200000X
License State: CA
Taxonomy Description: An otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ears, nose, throat, the respiratory and upper alimentary systems and related structures of the head and neck. An otolaryngologist diagnoses and provides medical and/or surgical therapy or prevention of diseases, allergies, neoplasms, deformities, disorders and/or injuries of the ears, nose, sinuses, throat, respiratory and upper alimentary systems, face, jaws and the other head and neck systems. Head and neck oncology, facial plastic and reconstructive surgery and the treatment of disorders of hearing and voice are fundamental areas of expertise.

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 1417741661, we treat the final digit (1) 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 1).

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 → 2

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 12 → 1 + 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 1 → 2 7 → 14 → 5 1 → 2 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 4 + 2 + 7 + 1 + 4 + 4 + 2 + 6 + 1 + 2 + 24 = 59

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

The next multiple of ten after 59 is 60. The difference is the calculated check digit.

60 - 59 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1417741661.