MARTIN JOSEPH WILLIAMS
NPI 1972199339
Social Worker in Oxnard, CA

NPI Status: Active since December 18, 2020

Contact Information

2130 N VENTURA RD
OXNARD, CA
ZIP 93036
Phone: (510) 317-1444

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

Individual
Male
Social Worker

About MARTIN WILLIAMS

This page provides the complete NPI Profile along with additional information for Martin Williams, a provider established in Oxnard, California with a medical specialization in Social Worker. The healthcare provider is registered in the NPI registry with number 1972199339 assigned on December 2020. The practitioner's primary taxonomy code is 104100000X with license number 130640 (CA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1972199339
Provider Name: MARTIN JOSEPH WILLIAMS
Gender: Male
Entity Type: Individual
Location Address: 2130 N VENTURA RD OXNARD, CA 93036
Location Phone: (510) 317-1444
Mailing Address: 2130 N VENTURA RD OXNARD, CA 93036
Mailing Phone: (510) 317-1444
Is Sole Proprietor?: No
Enumeration Date: 12-18-2020
Last Update Date: 07-25-2025
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A social worker like Martin Williams helps patients solve and cope with problems in their everyday lives, diagnoses and treats mental, behavioral, and emotional problems. Social workers help in wide range of situations, such as adopting a child, illness, divorce, or unemployment.

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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: Social Worker
Taxonomy Code: 104100000X
Type: Behavioral Health & Social Service Providers
License No.: 130640
License State: CA
Taxonomy Description: A social worker is a person who is qualified by a Social Work degree, and licensed, certified or registered by the state as a social worker to practice within the scope of that license. A social worker provides assistance and counseling to clients and their families who are dealing with social, emotional and environmental problems. Social work services may be rendered to individuals, families, groups, and the public.

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	172V00000X	Other Service Providers	Community Health Worker
2	373H00000X	Nursing Service Related Providers	Day Training/Habilitation Specialist

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 1972199339, 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 71. The final step is to find the difference between that total and the next multiple of ten (80 - 71 = 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.

Pos 1

Doubled → 2

Pos 2

Unchanged

Pos 3

Doubled → 14 → 1 + 4

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 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 7 → 14 → 5 1 → 2 9 → 18 → 9 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 9 + 1 + 4 + 2 + 2 + 9 + 1 + 8 + 3 + 6 + 24 = 71

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

The next multiple of ten after 71 is 80. The difference is the calculated check digit.

80 - 71 = 9

This NPI is valid

The calculated check digit is 9, which matches the last digit of 1972199339.