MR. MICHAEL D. TOLLEFSON
NPI 1578490231
Counselor - School in San Juan Capistrano, CA

NPI Status: Active since May 06, 2026

Contact Information

33122 VALLE RD
SAN JUAN CAPISTRANO, CA
ZIP 92675
Phone: (949) 234-9200
Fax: (949) 493-8729

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

Individual
Male
Counselor
School

About MICHAEL TOLLEFSON

This page provides the complete NPI Profile along with additional information for Michael Tollefson, a provider established in San Juan Capistrano, California with a medical specialization in Counselor, focusing in school . The healthcare provider is registered in the NPI registry with number 1578490231 assigned on May 2026. The practitioner's primary taxonomy code is 101YS0200X with license number 260112286 (CA). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1578490231
Provider Name: MR. MICHAEL D. TOLLEFSON
Gender: Male
Entity Type: Individual
Location Address: 33122 VALLE RD SAN JUAN CAPISTRANO, CA 92675
Location Phone: (949) 234-9200
Location Fax: (949) 493-8729
Mailing Address: 33916 GOLDEN LANTERN APT B DANA POINT, CA 92629
Mailing Phone: (702) 505-3060
Is Sole Proprietor?: No
Enumeration Date: 05-06-2026
Last Update Date: 05-06-2026
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Location Map

Secondary Locations

29070 Shark Bay
Laguna Niguel, CA 92677
(949) 234-5360

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: Counselor School
Taxonomy Code: 101YS0200X
Type: Behavioral Health & Social Service Providers
License No.: 260112286
License State: CA

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 1578490231, 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 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 → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 0

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 7 → 14 → 5 4 → 8 0 → 0 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 5 + 1 + 4 + 8 + 8 + 9 + 0 + 2 + 6 + 24 = 69

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

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1578490231.