GREGORY T SCHIMKAT RN, MSN
NPI 1275464265
Nurse Practitioner - Psychiatric/Mental Health in Oshkosh, WI

NPI Status: Active since May 27, 2026

Contact Information

600 N WESTHAVEN DR
OSHKOSH, WI
ZIP 54904
Phone: (920) 720-2300

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Newly Listed Provider
This NPI profile has been added to the NPI registry within the last 30 days.

Table of Contents

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

Individual
Male
Nurse Practitioner
Psychiatric/Mental Health

About GREGORY SCHIMKAT

This page provides the complete NPI Profile along with additional information for Gregory Schimkat, a provider established in Oshkosh, Wisconsin with a medical specialization in Nurse Practitioner, focusing in psychiatric/mental health . The healthcare provider is registered in the NPI registry with number 1275464265 assigned on May 2026. The practitioner's primary taxonomy code is 363LP0808X with license number 23341330 (WI). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1275464265
Provider Name: GREGORY T SCHIMKAT RN, MSN
Other Name: MR. GREGORY TAYLOR SCHIMKAT RN, MSN
Other Name Type: Professional Name (2)
Gender: Male
Entity Type: Individual
Location Address: 600 N WESTHAVEN DR OSHKOSH, WI 54904
Location Phone: (920) 720-2300
Mailing Address: 600 N WESTHAVEN DR OSHKOSH, WI 54904
Is Sole Proprietor?: No
Enumeration Date: 05-27-2026
Last Update Date: 05-27-2026
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A nurse practitioner (NP) like Gregory Schimkat 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.

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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.: 23341330
License State: WI

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 1275464265, we treat the final digit (5) 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 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).

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 → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 8

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 12 → 1 + 2

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 7 → 14 → 5 4 → 8 4 → 8 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 1 + 4 + 5 + 8 + 6 + 8 + 2 + 1 + 2 + 24 = 65

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

The next multiple of ten after 65 is 70. The difference is the calculated check digit.

70 - 65 = 5

This NPI is valid

The calculated check digit is 5, which matches the last digit of 1275464265.