DA HAO RUAN
NPI 1245024231
Student in an Organized Health Care Education/Training Program in San Jose, CA

NPI Status: Active since April 07, 2025

Contact Information

1075 E SANTA CLARA ST FL 2
SAN JOSE, CA
ZIP 95116
Phone: (510) 325-2161

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

Individual
Male
Student in an Organized Health Care Educ...

About DA HAO RUAN

This page provides the complete NPI Profile along with additional information for Da Hao Ruan, a primary care provider established in San Jose, California with a medical specialization in Student In An Organized Health Care Education/training Program. The healthcare provider is registered in the NPI registry with number 1245024231 assigned on April 2025. The practitioner's primary taxonomy code is 390200000X. The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1245024231
Provider Name: DA HAO RUAN
Gender: Male
Entity Type: Individual
Location Address: 1075 E SANTA CLARA ST FL 2 SAN JOSE, CA 95116
Location Phone: (510) 325-2161
Mailing Address: 1161 3RD AVE OAKLAND, CA 94606
Mailing Phone: (510) 325-2161
Is Sole Proprietor?: No
Enumeration Date: 04-07-2025
Last Update Date: 04-07-2025
Code Navigator

A primary care provider (PCP) like Da Hao Ruan sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, etc .

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: Student in an Organized Health Care Education/Training Program
Taxonomy Code: 390200000X
Type: Student, Health Care
Taxonomy Description: An individual who is enrolled in an organized health care education/training program leading to a degree, certification, registration, and/or licensure to provide health care.

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 1245024231, 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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 8

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 4 → 8 0 → 0 4 → 8 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 8 + 5 + 0 + 2 + 8 + 2 + 6 + 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 1245024231.