NICOLAUS WILLIAMS PMHNP-BC
NPI 1881543841
Nurse Practitioner - Psychiatric/Mental Health in Austin, TX

NPI Status: Active since January 23, 2026

Contact Information

1600 W 38TH ST STE 318
AUSTIN, TX
ZIP 78731
Phone: (512) 203-3588
Fax: (512) 957-0156

NPI Profile Information
Primary Taxonomy
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Nurse Practitioner
Psychiatric/Mental Health

About NICOLAUS WILLIAMS

This page provides the complete NPI Profile along with additional information for Nicolaus Williams, a provider established in Austin, Texas with a medical specialization in Nurse Practitioner, focusing in psychiatric/mental health . The healthcare provider is registered in the NPI registry with number 1881543841 assigned on January 2026. The practitioner's primary taxonomy code is 363LP0808X with license number 1216723 (TX). The provider is registered as an individual and his NPI record was last updated January 2026.

NPI: 1881543841
Provider Name: NICOLAUS WILLIAMS PMHNP-BC
Gender: Male
Entity Type: Individual
Location Address: 1600 W 38TH ST STE 318 AUSTIN, TX 78731
Location Phone: (512) 203-3588
Location Fax: (512) 957-0156
Mailing Address: 1600 W 38TH ST STE 318 AUSTIN, TX 78731
Mailing Phone: (512) 203-3588
Mailing Fax: (512) 957-0156
Is Sole Proprietor?: No
Enumeration Date: 01-23-2026
Last Update Date: 01-23-2026
Code Navigator

A nurse practitioner (NP) like Nicolaus Williams is an experienced registered nurse with a master’s or doctoral degree and advanced clinical training. Nurse practitioners can work in many different specialties including primary care, pediatrics, cardiology, emergency, women’s health, oncology or geriatrics. Nurse practitioners provide services like physical exams, order laboratory tests, manage diseases, write prescriptions, etc.

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: Nurse Practitioner Psychiatric/Mental Health
Taxonomy Code: 363LP0808X
Type: Physician Assistants & Advanced Practice Nursing Providers
License No.: 1216723
License State: TX

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 1881543841, we treat the final digit (1) 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 1).

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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 16 → 1 + 6

Pos 4

Unchanged

Pos 5

Doubled → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 6

Pos 8

Unchanged

Pos 9

Doubled → 8

Check

Target digit

Regular digit Doubled digit Check digit

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.

1 → 2 8 → 16 → 7 5 → 10 → 1 3 → 6 4 → 8

Step 2: Add all digits plus the NPI constant

Add the transformed values, the unchanged digits, and the constant 24.

2 + 8 + 1 + 6 + 1 + 1 + 0 + 4 + 6 + 8 + 8 + 24 = 69

Step 3: Find the amount needed to reach the next multiple of 10

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1881543841.