EWALD MICHAEL WEFELMEYER PHD
NPI 1326994831
Psychologist - Clinical in Saint Louis, MO

NPI Status: Active since March 06, 2026

Contact Information

1129 MACKLIND AVE
SAINT LOUIS, MO
ZIP 63110
Phone: (314) 534-0200

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

Individual
Male
Psychologist
Clinical

About EWALD WEFELMEYER

This page provides the complete NPI Profile along with additional information for Ewald Wefelmeyer, a provider established in Saint Louis, Missouri with a medical specialization in Psychologist, focusing in clinical . The healthcare provider is registered in the NPI registry with number 1326994831 assigned on March 2026. The practitioner's primary taxonomy code is 103TC0700X with license number 2026009981 (MO). The provider is registered as an individual and his NPI record was last updated March 2026.

NPI: 1326994831
Provider Name: EWALD MICHAEL WEFELMEYER PHD
Gender: Male
Entity Type: Individual
Location Address: 1129 MACKLIND AVE SAINT LOUIS, MO 63110
Location Phone: (314) 534-0200
Mailing Address: 1129 MACKLIND AVE SAINT LOUIS, MO 63110
Is Sole Proprietor?: No
Enumeration Date: 03-06-2026
Last Update Date: 03-06-2026
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A clinical psychologist like Ewald Wefelmeyer assesses, diagnoses, and treats mental, emotional, and behavioral disorders. Clinical psychologists help people deal with problems ranging from short-term personal issues to severe, chronic conditions. Clinical psychologists interview patients, give diagnostic tests, provide psychotherapy and design behavior modification programs to help patients.

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: Psychologist Clinical
Taxonomy Code: 103TC0700X
Type: Behavioral Health & Social Service Providers
License No.: 2026009981
License State: MO
Taxonomy Description: A psychologist who provides continuing and comprehensive mental and behavioral health care for individuals and families; consultation to agencies and communities; training, education and supervision; and research-based practice. It is a specialty in breadth -- one that is broadly inclusive of severe psychopathology -- and marked by comprehensiveness and integration of knowledge and skill from a broad array of disciplines within and outside of psychology proper. The scope of clinical psychology encompasses all ages, multiple diversities and varied systems.

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 1326994831, 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 79. The final step is to find the difference between that total and the next multiple of ten (80 - 79 = 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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 6

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 2 → 4 9 → 18 → 9 4 → 8 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 4 + 6 + 1 + 8 + 9 + 8 + 8 + 6 + 24 = 79

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

The next multiple of ten after 79 is 80. The difference is the calculated check digit.

80 - 79 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1326994831.