MARK GRUDLE
NPI 1679434989
Peer Specialist in Tigard, OR
NPI Status: Active since November 18, 2025
Contact Information
10362 SW MCDONALD ST
TIGARD, OR
ZIP 97224
Phone: (971) 202-7964
- Individual
- Peer Specialist
About MARK GRUDLE
This page provides the complete NPI Profile along with additional information for Mark Grudle, a provider established in Tigard, Oregon operating as a Peer Specialist. The healthcare provider is registered in the NPI registry with number 1679434989 assigned on November 2025. The practitioner's primary taxonomy code is 175T00000X. The provider is registered as an individual and their NPI record was last updated one year ago.
- NPI
- 1679434989
- Provider Name
- MARK GRUDLE
- Gender
- Entity Type
- Individual
- Location Address
- 10362 SW MCDONALD ST TIGARD, OR 97224
- Location Phone
- (971) 202-7964
- Mailing Address
- 1027 E BURNSIDE ST PORTLAND, OR 97214
- Mailing Phone
- (503) 239-8400
- Is Sole Proprietor?
- No
- Enumeration Date
- 11-18-2025
- Last Update Date
- 11-18-2025
- 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
Peer Specialist
- Taxonomy Code
- 175T00000X
- Type
- Other Service Providers
- Taxonomy Description
- Individuals certified to perform peer support services through a training process defined by a government agency, such as the Department of Veterans Affairs or a state mental health department/certification/licensing authority.
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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 1679434989, 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 81. The final step is to find the difference between that total and the next multiple of ten (90 - 81 = 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 81 is 90. The difference is the calculated check digit.
Other Providers at the Same Location
The following 18 providers are registered at the same or a nearby location.
TIGARD, OR 97224
TIGARD, OR 97224
TIGARD, OR 97224
TIGARD, OR 97224
TIGARD, OR 97224
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1679434989, enumerated as an "individual" on November 18, 2025.
The provider is located at 10362 SW MCDONALD ST TIGARD, OR 97224 and the phone number is (971) 202-7964.
Peer Specialist with taxonomy code 175T00000X.
