TIMOTHY JEEHWAN CHESLER
NPI 1609709369
Counselor - Mental Health in Andover, MA
NPI Status: Active since June 03, 2026
Contact Information
2 DUNDEE PARK DR STE 301
ANDOVER, MA
ZIP 01810
Phone: (978) 396-9866
This NPI profile has been added to the NPI registry within the last 30 days.
- Individual
- Male
- Counselor
- Mental Health
About TIMOTHY CHESLER
This page provides the complete NPI Profile along with additional information for Timothy Chesler, a provider established in Andover, Massachusetts with a medical specialization in Counselor, focusing in mental health . The healthcare provider is registered in the NPI registry with number 1609709369 assigned on June 2026. The practitioner's primary taxonomy code is 101YM0800X. The provider is registered as an individual and his NPI record was last updated June 2026.
- NPI
- 1609709369
- Provider Name
- TIMOTHY JEEHWAN CHESLER
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 2 DUNDEE PARK DR STE 301 ANDOVER, MA 01810
- Location Phone
- (978) 396-9866
- Mailing Address
- 131 MERRIMAC ST APT 1 NEWBURYPORT, MA 01950
- Is Sole Proprietor?
- No
- Enumeration Date
- 06-03-2026
- Last Update Date
- 06-03-2026
- Code Navigator
A mental health counselor like Timothy Chesler provides treatment to individuals, families, couples, and groups for mental and emotional health issues and relationship problems. Mental health counselors treat clients with a variety of conditions, including anxiety, depression, grief, low self-esteem, stress, and suicidal impulses.
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 Mental Health
- Taxonomy Code
- 101YM0800X
- Type
- Behavioral Health & Social Service Providers
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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 1609709369, 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 61. The final step is to find the difference between that total and the next multiple of ten (70 - 61 = 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 61 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 6 providers are registered at the same or a nearby location.
ANDOVER, MA 01810
ANDOVER, MA 01810
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1609709369, enumerated as an "individual" on June 03, 2026.
The provider is located at 2 DUNDEE PARK DR STE 301 ANDOVER, MA 01810 and the phone number is (978) 396-9866.
Counselor with taxonomy code 101YM0800X and a focus in Mental Health.
