WILLIAM GARDNER BARKER LAC
NPI 1174469589
Counselor in Tucson, AZ
NPI Status: Active since April 27, 2026
Contact Information
4888 N STONE AVE UNIT 120
TUCSON, AZ
ZIP 85704
Phone: (520) 670-3909
Fax: (520) 309-2560
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.
- Individual
- Male
- Counselor
About WILLIAM BARKER
This page provides the complete NPI Profile along with additional information for William Barker, a provider established in Tucson, Arizona with a medical specialization in Counselor. The healthcare provider is registered in the NPI registry with number 1174469589 assigned on April 2026. The practitioner's primary taxonomy code is 101Y00000X. The provider is registered as an individual and his NPI record was last updated May 2026.
- NPI
- 1174469589
- Provider Name
- WILLIAM GARDNER BARKER LAC
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 4888 N STONE AVE UNIT 120 TUCSON, AZ 85704
- Location Phone
- (520) 670-3909
- Location Fax
- (520) 309-2560
- Mailing Address
- 839 W CONGRESS ST TUCSON, AZ 85745
- Mailing Phone
- (520) 670-3909
- Mailing Fax
- (520) 309-2560
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-27-2026
- Last Update Date
- 05-19-2026
- 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
- Taxonomy Code
- 101Y00000X
- Type
- Behavioral Health & Social Service Providers
- License State
- AZ
- Taxonomy Description
- A provider who is trained and educated in the performance of behavior health services through interpersonal communications and analysis. Training and education at the specialty level usually requires a master's degree and clinical experience and supervision for licensure or certification.
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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 1174469589, 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 71. The final step is to find the difference between that total and the next multiple of ten (80 - 71 = 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 71 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 4 providers are registered at the same or a nearby location.
TUCSON, AZ 85704
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1174469589, enumerated as an "individual" on April 27, 2026.
The provider is located at 4888 N STONE AVE UNIT 120 TUCSON, AZ 85704 and the phone number is (520) 670-3909.
Counselor with taxonomy code 101Y00000X.
