OLIVIA LEWIS
NPI 1003624941
Marriage & Family Therapist in San Francisco, CA

NPI Status: Active since December 24, 2024

Contact Information

601 CLEMENT ST
SAN FRANCISCO, CA
ZIP 94118
Phone: (415) 668-5955
Fax: (415) 668-0246

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

Individual
Female
Marriage & Family Therapist

About OLIVIA LEWIS

This page provides the complete NPI Profile along with additional information for Olivia Lewis, a provider established in San Francisco, California with a medical specialization in Marriage & Family Therapist. The healthcare provider is registered in the NPI registry with number 1003624941 assigned on December 2024. The practitioner's primary taxonomy code is 106H00000X with license number 147945 (CA). The provider is registered as an individual and her NPI record was last updated February 2026.

NPI: 1003624941
Provider Name: OLIVIA LEWIS
Gender: Female
Entity Type: Individual
Location Address: 601 CLEMENT ST SAN FRANCISCO, CA 94118
Location Phone: (415) 668-5955
Location Fax: (415) 668-0246
Mailing Address: 601 CLEMENT ST SAN FRANCISCO, CA 94118
Mailing Phone: (415) 668-5955
Mailing Fax: (415) 668-0246
Is Sole Proprietor?: No
Enumeration Date: 12-24-2024
Last Update Date: 02-04-2026
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A marriage and family therapist like Olivia Lewis help patients manage problems with their family and other relationships. Marriage and family therapists encourage clients to discuss their emotions and experiences and, develop strategies and skills to change behavior and cope with difficult situations. Many therapists apply cognitive behavioral therapy to help patients understand harmful thoughts, feelings, and also teach patients how to replace them with positive, life-enhancing ones.

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: Marriage & Family Therapist
Taxonomy Code: 106H00000X
Type: Behavioral Health & Social Service Providers
License No.: 147945
License State: CA
Taxonomy Description: A marriage and family therapist is a person with a master's degree in marriage and family therapy, or a master's or doctoral degree in a related mental health field with substantially equivalent coursework in marriage and family therapy, who receives supervised clinical experience, or a person who meets the state requirements to practice as a marriage and family therapist. A marriage and family therapist treats mental and emotional disorders within the context of marriage and family systems. A marriage and family therapist provides mental health and counseling services to individuals, couples, families, and groups.

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 1003624941, 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 12 → 1 + 2

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 8

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 0 → 0 6 → 12 → 3 4 → 8 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 0 + 0 + 3 + 1 + 2 + 2 + 8 + 9 + 8 + 24 = 59

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

The next multiple of ten after 59 is 60. The difference is the calculated check digit.

60 - 59 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1003624941.