DR. VERNON ANTHONY ROSARIO II MD, PHD
NPI 1003920117
Psychiatry & Neurology - Child & Adolescent Psychiatry in Los Angeles, CA

NPI Status: Active since August 18, 2006

Contact Information

3727 W 6TH ST STE 402
LOS ANGELES, CA
ZIP 90020
Phone: (213) 365-7400
Fax: (213) 201-3993

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

Individual
Male
Psychiatry & Neurology
Child & Adolescent Psychiatry

About VERNON ROSARIO

This page provides the complete NPI Profile along with additional information for Vernon Rosario, a provider established in Los Angeles, California with a medical specialization in Psychiatry & Neurology, focusing in child & adolescent psychiatry . The healthcare provider is registered in the NPI registry with number 1003920117 assigned on August 2006. The practitioner's primary taxonomy code is 2084P0804X with license number A066651 (CA). The provider is registered as an individual and his NPI record was last updated January 2026.

NPI: 1003920117
Provider Name: DR. VERNON ANTHONY ROSARIO II MD, PHD
Gender: Male
Entity Type: Individual
Location Address: 3727 W 6TH ST STE 402 LOS ANGELES, CA 90020
Location Phone: (213) 365-7400
Location Fax: (213) 201-3993
Mailing Address: 3727 W 6TH ST STE 402 LOS ANGELES, CA 90020
Mailing Phone: (213) 365-7400
Mailing Fax: (213) 201-3993
Is Sole Proprietor?: Yes
Enumeration Date: 08-18-2006
Last Update Date: 01-22-2026
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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: Psychiatry & Neurology Child & Adolescent Psychiatry
Taxonomy Code: 2084P0804X
Type: Allopathic & Osteopathic Physicians
License No.: A066651
License State: CA
Taxonomy Description: Child & Adolescent Psychiatry is a subspecialty of psychiatry with additional skills and training in the diagnosis and treatment of developmental, behavioral, emotional, and mental disorders of childhood and adolescence.

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 1003920117, we treat the final digit (7) 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 43. The final step is to find the difference between that total and the next multiple of ten (50 - 43 = 7).

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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 0

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 0 → 0 9 → 18 → 9 0 → 0 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 0 + 3 + 1 + 8 + 2 + 0 + 1 + 2 + 24 = 43

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

The next multiple of ten after 43 is 50. The difference is the calculated check digit.

50 - 43 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1003920117.