JACK GORDON FERRELL PH.D.
NPI 1427250786
Psychologist - Forensic in San Antonio, TX
NPI Status: Active since May 31, 2007
Contact Information
14310 NORTHBROOK DR
SUITE120
SAN ANTONIO, TX
ZIP 78232
Phone: (210) 499-5025
Fax: (210) 499-5825
- Individual
- Male
- Psychologist
- Forensic
About JACK FERRELL
This page provides the complete NPI Profile along with additional information for Jack Ferrell, a provider established in San Antonio, Texas with a medical specialization in Psychologist, focusing in forensic . The healthcare provider is registered in the NPI registry with number 1427250786 assigned on May 2007. The practitioner's primary taxonomy code is 103TF0200X with license number 20880 (TX). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1427250786
- Provider Name
- JACK GORDON FERRELL PH.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 14310 NORTHBROOK DR SUITE120 SAN ANTONIO, TX 78232
- Location Phone
- (210) 499-5025
- Location Fax
- (210) 499-5825
- Mailing Address
- 14310 NORTHBROOK DR SUITE120 SAN ANTONIO, TX 78232
- Mailing Phone
- (210) 499-5025
- Mailing Fax
- (210) 499-5825
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 05-31-2007
- Last Update Date
- 09-11-2025
- 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
Psychologist Forensic
- Taxonomy Code
- 103TF0200X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 20880
- License State
- TX
- Taxonomy Description
- A psychologist whose specialty is characterized by activities primarily intended to provide professional psychological expertise within the judicial and legal systems.
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 | 103TC0700X | Behavioral Health & Social Service Providers | Psychologist | 20880 (TX) |
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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 1427250786, we treat the final digit (6) 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 64. The final step is to find the difference between that total and the next multiple of ten (70 - 64 = 6).
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 64 is 70. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1427250786, enumerated as an "individual" on May 31, 2007.
The provider is located at 14310 NORTHBROOK DR SUITE120 SAN ANTONIO, TX 78232 and the phone number is (210) 499-5025.
Psychologist with taxonomy code 103TF0200X and a focus in Forensic.
