ROBERT DOUGLAS MESSER MA
NPI 1154172328
Counselor - Professional in Knoxville, TN

NPI Status: Active since March 27, 2024

Contact Information

10261 KINGSTON PIKE
KNOXVILLE, TN
ZIP 37922
Phone: (865) 283-1777

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

Individual
Male
Counselor
Professional

About ROBERT MESSER

This page provides the complete NPI Profile along with additional information for Robert Messer, a provider established in Knoxville, Tennessee with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1154172328 assigned on March 2024. The practitioner's primary taxonomy code is 101YP2500X with license number 6037 (TN). The provider is registered as an individual and his NPI record was last updated 2 years ago.

NPI: 1154172328
Provider Name: ROBERT DOUGLAS MESSER MA
Gender: Male
Entity Type: Individual
Location Address: 10261 KINGSTON PIKE KNOXVILLE, TN 37922
Location Phone: (865) 283-1777
Mailing Address: 10261 KINGSTON PIKE KNOXVILLE, TN 37922
Mailing Phone: (865) 283-1777
Is Sole Proprietor?: No
Enumeration Date: 03-27-2024
Last Update Date: 03-27-2024
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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 Professional
Taxonomy Code: 101YP2500X
Type: Behavioral Health & Social Service Providers
License No.: 6037
License State: TN

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 1154172328, 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 52. The final step is to find the difference between that total and the next multiple of ten (60 - 52 = 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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 4

Pos 8

Unchanged

Pos 9

Doubled → 4

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 5 → 10 → 1 1 → 2 2 → 4 2 → 4

Step 2: Add all digits plus the NPI constant

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

2 + 1 + 1 + 0 + 4 + 2 + 7 + 4 + 3 + 4 + 24 = 52

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

The next multiple of ten after 52 is 60. The difference is the calculated check digit.

60 - 52 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1154172328.