BARRY CALLAHAN JR. BA
NPI 1679257109
Counselor - Professional in Oxford, MI
NPI Status: Active since June 14, 2023
Contact Information
2B S WASHINGTON ST
OXFORD, MI
ZIP 48371
Phone: (248) 834-0614
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Counselor
- Professional
About BARRY CALLAHAN JR.
This page provides the complete NPI Profile along with additional information for Barry Callahan Jr., a provider established in Oxford, Michigan with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1679257109 assigned on June 2023. The practitioner's primary taxonomy code is 101YP2500X with license number 6451025041 (MI). The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1679257109
- Provider Name
- BARRY CALLAHAN JR. BA
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 2B S WASHINGTON ST OXFORD, MI 48371
- Location Phone
- (248) 834-0614
- Mailing Address
- 45627 UTICA GRN E SHELBY TOWNSHIP, MI 48317
- Mailing Phone
- (941) 800-6629
- Is Sole Proprietor?
- No
- Enumeration Date
- 06-14-2023
- Last Update Date
- 06-22-2026
- Code Navigator
Location Map
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.
- 6451025041
- License State
- MI
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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 1679257109, we treat the final digit (9) 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 9).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 61 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 18 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1679257109, enumerated as an "individual" on June 14, 2023.
The provider is located at 2B S WASHINGTON ST OXFORD, MI 48371 and the phone number is (248) 834-0614.
Counselor with taxonomy code 101YP2500X and a focus in Professional.
