MR. JOHN S MAREK LPC, LMFT
NPI 1750583704
Counselor - Professional in Austin, TX
NPI Status: Active since June 01, 2007
Contact Information
13740 N HIGHWAY 183
SUITE H-1
AUSTIN, TX
ZIP 78750
Phone: (512) 258-3421
- Individual
- Male
- Counselor
- Professional
About JOHN MAREK
This page provides the complete NPI Profile along with additional information for John Marek, a provider established in Austin, Texas with a medical specialization in Counselor, focusing in professional . The healthcare provider is registered in the NPI registry with number 1750583704 assigned on June 2007. The practitioner's primary taxonomy code is 101YP2500X with license number 3435 (TX). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1750583704
- Provider Name
- MR. JOHN S MAREK LPC, LMFT
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 13740 N HIGHWAY 183 SUITE H-1 AUSTIN, TX 78750
- Location Phone
- (512) 258-3421
- Mailing Address
- 13740 N HIGHWAY 183 SUITE H-1 AUSTIN, TX 78750
- Mailing Phone
- (512) 258-3421
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-01-2007
- 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
Counselor Professional
- Taxonomy Code
- 101YP2500X
- Type
- Behavioral Health & Social Service Providers
- License No.
- 3435
- License State
- TX
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 | 106H00000X | Behavioral Health & Social Service Providers | Marriage & Family Therapist | 2375 (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 1750583704, we treat the final digit (4) 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 56. The final step is to find the difference between that total and the next multiple of ten (60 - 56 = 4).
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 56 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 8 providers are registered at the same or a nearby location.
AUSTIN, TX 78750
AUSTIN, TX 78750
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1750583704, enumerated as an "individual" on June 01, 2007.
The provider is located at 13740 N HIGHWAY 183 SUITE H-1 AUSTIN, TX 78750 and the phone number is (512) 258-3421.
Counselor with taxonomy code 101YP2500X and a focus in Professional.
