DR. JOHN O. VIESSELMAN M.D.
NPI 1124096250
Psychiatry & Neurology - Child & Adolescent Psychiatry in Santa Ana, CA

NPI Status: Active since March 14, 2006

Contact Information

1666 N MAIN ST STE 400
SANTA ANA, CA
ZIP 92701
Phone: (714) 704-5900

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

Individual
Male
Psychiatry & Neurology
Child & Adolescent Psychiatry

About JOHN VIESSELMAN

This page provides the complete NPI Profile along with additional information for John Viesselman, a provider established in Santa Ana, California with a medical specialization in Psychiatry & Neurology, focusing in child & adolescent psychiatry . The healthcare provider is registered in the NPI registry with number 1124096250 assigned on March 2006. The practitioner's primary taxonomy code is 2084P0804X with license number G25102 (CA). The provider is registered as an individual and his NPI record was last updated 12 years ago.

NPI: 1124096250
Provider Name: DR. JOHN O. VIESSELMAN M.D.
Gender: Male
Entity Type: Individual
Location Address: 1666 N MAIN ST STE 400 SANTA ANA, CA 92701
Location Phone: (714) 704-5900
Mailing Address: 24802 RITTENHOUSE CIR LAGUNA HILLS, CA 92653
Mailing Phone: (949) 855-1482
Is Sole Proprietor?: Yes
Enumeration Date: 03-14-2006
Last Update Date: 02-06-2014
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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.: G25102
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.

Secondary Taxonomies

The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.

No.	Taxonomy Code	Type	Classification / Specialization	License No. (State)
1	2084P0800X	Allopathic & Osteopathic Physicians	Psychiatry & Neurology Psychiatry	G25102 (CA)
2	2084P0800X	Allopathic & Osteopathic Physicians	Psychiatry & Neurology Psychiatry	MD11763 (HI)
3	2084P0804X	Allopathic & Osteopathic Physicians	Psychiatry & Neurology Child & Adolescent Psychiatry	MD11763 (HI)

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 1124096250, 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 50. The final step is to find the difference between that total and the next multiple of ten (50 - 50 = 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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 12 → 1 + 2

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

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 2 → 4 0 → 0 6 → 12 → 3 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 4 + 4 + 0 + 9 + 1 + 2 + 2 + 1 + 0 + 24 = 50

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

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

50 - 50 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1124096250.