ISAAC TAYLOR GERHARTZ
NPI 1013711399
Technician/Technologist - Optician in Greenfield, WI
NPI Status: Active since April 03, 2025
Contact Information
10600 W LAYTON AVE
GREENFIELD, WI
ZIP 53228
Phone: (414) 209-0359
Fax: (414) 427-6168
- Individual
- Male
- Technician/Technologist
- Optician
About ISAAC GERHARTZ
This page provides the complete NPI Profile along with additional information for Isaac Gerhartz, a provider established in Greenfield, Wisconsin with a medical specialization in Technician/technologist, focusing in optician . The healthcare provider is registered in the NPI registry with number 1013711399 assigned on April 2025. The practitioner's primary taxonomy code is 156FX1800X with license number ABOC-264958 (WI). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1013711399
- Provider Name
- ISAAC TAYLOR GERHARTZ
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 10600 W LAYTON AVE GREENFIELD, WI 53228
- Location Phone
- (414) 209-0359
- Location Fax
- (414) 427-6168
- Mailing Address
- 2562 S 85TH ST WEST ALLIS, WI 53227
- Mailing Phone
- (414) 304-9542
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-03-2025
- Last Update Date
- 04-10-2025
- Code Navigator
Location Map
Secondary Locations
- 250 Wolf Run
Mukwonago, WI 53149
(262) 363-2895 - W159S6530 Moorland Rd
Muskego, WI 53150
(414) 209-0321
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
Technician/Technologist Optician
- Taxonomy Code
- 156FX1800X
- Type
- Eye and Vision Services Providers
- License No.
- ABOC-264958
- License State
- WI
- Taxonomy Description
- Opticians help fit eyeglasses and contact lenses, following prescriptions from Ophthalmologists and Optometrists. They also help customers decide which eyeglass frame or contact lenses to buy.
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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 1013711399, 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 51. The final step is to find the difference between that total and the next multiple of ten (60 - 51 = 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 51 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 7 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1013711399, enumerated as an "individual" on April 03, 2025.
The provider is located at 10600 W LAYTON AVE GREENFIELD, WI 53228 and the phone number is (414) 209-0359.
Technician/Technologist with taxonomy code 156FX1800X and a focus in Optician.
