DR. DONALD O TESSMER PSY.D.
NPI 1740400530
Psychologist - School in Los Angeles, CA
NPI Status: Active since April 26, 2007
Contact Information
10436 SANTA MONICA BLVD
3005
LOS ANGELES, CA
ZIP 90025
Phone: (310) 393-2626
- Individual
- Male
- Psychologist
- School
About DONALD TESSMER
This page provides the complete NPI Profile along with additional information for Donald Tessmer, a provider established in Los Angeles, California with a medical specialization in Psychologist, focusing in school . The healthcare provider is registered in the NPI registry with number 1740400530 assigned on April 2007. The practitioner's primary taxonomy code is 103TS0200X with license number LEP 1817 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1740400530
- Provider Name
- DR. DONALD O TESSMER PSY.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 10436 SANTA MONICA BLVD 3005 LOS ANGELES, CA 90025
- Location Phone
- (310) 393-2626
- Mailing Address
- 4640 GLENCOE AVE APT 5 MARINA DEL REY, CA 90292
- Mailing Phone
- (310) 827-4307
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 04-26-2007
- Last Update Date
- 09-11-2025
- 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
Psychologist School
- Taxonomy Code
- 103TS0200X
- Type
- Behavioral Health & Social Service Providers
- License No.
- LEP 1817
- License State
- CA
- Taxonomy Description
- A psychologist whose specialty is concerned with the science and practice of psychology with children, youth, families; learners of all ages; and the schooling process. The basic education and training of school psychologists prepares them to provide a range of psychological diagnosis, assessment, intervention, prevention, health promotion, and program development and evaluation services with a special focus on the developmental processes of children and youth within the context of schools, families and other systems. School psychologists are prepared to intervene at the individual and system level, and develop, implement, and evaluate preventive programs. In these efforts, they conduct ecologically valid assessments and intervene to promote positive learning environments within which children and youth from diverse backgrounds to ensure that all have equal access to effective educational and psychological services that promote healthy development
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 103T00000X | Behavioral Health & Social Service Providers | Psychologist | LEP (CA) |
Reviews for DR. DONALD O TESSMER PSY.D.
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 1740400530, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).
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 60 is 60. The difference is the calculated check digit.
Other Providers at the Same Location
The following 19 providers are registered at the same or a nearby location.
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
LOS ANGELES, CA 90025
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1740400530, enumerated as an "individual" on April 26, 2007.
The provider is located at 10436 SANTA MONICA BLVD 3005 LOS ANGELES, CA 90025 and the phone number is (310) 393-2626.
Psychologist with taxonomy code 103TS0200X and a focus in School.
