MARK J KROLL
NPI 1417772708
Counselor - School in Centennial, CO

NPI Status: Active since November 20, 2024

Contact Information

6909 S HOLLY CIR STE 304
CENTENNIAL, CO
ZIP 80112
Phone: (720) 828-3226

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

Individual
Male
Counselor
School

About MARK KROLL

This page provides the complete NPI Profile along with additional information for Mark Kroll, a provider established in Centennial, Colorado with a medical specialization in Counselor, focusing in school . The healthcare provider is registered in the NPI registry with number 1417772708 assigned on November 2024. The practitioner's primary taxonomy code is 101YS0200X with license number 24407356 (CO). The provider is registered as an individual and his NPI record was last updated 2 years ago.

NPI: 1417772708
Provider Name: MARK J KROLL
Gender: Male
Entity Type: Individual
Location Address: 6909 S HOLLY CIR STE 304 CENTENNIAL, CO 80112
Location Phone: (720) 828-3226
Mailing Address: 1284 N DOWNING ST UNIT 501 DENVER, CO 80218
Mailing Phone: (303) 859-1447
Is Sole Proprietor?: No
Enumeration Date: 11-20-2024
Last Update Date: 11-20-2024
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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: Counselor School
Taxonomy Code: 101YS0200X
Type: Behavioral Health & Social Service Providers
License No.: 24407356
License State: CO

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	101YP2500X	Behavioral Health & Social Service Providers	Counselor Professional	LPCC.0021454 (CO)

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 1417772708, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).

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 → 4

Pos 8

Unchanged

Pos 9

Doubled → 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 1 → 2 7 → 14 → 5 2 → 4 0 → 0

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 + 7 + 4 + 7 + 0 + 24 = 62

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

The next multiple of ten after 62 is 70. The difference is the calculated check digit.

70 - 62 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1417772708.