DR. MICHAEL A HUFF PHD
NPI 1619171337
Substance Abuse Rehabilitation Facility in San Francisco, CA

NPI Status: Active since June 14, 2007

Contact Information

564 6TH ST
SAN FRANCISCO, CA
ZIP 94103
Phone: (415) 489-7314
Fax: (510) 465-4873

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

Individual
Male
Substance Abuse Rehabilitation Facility

About MICHAEL HUFF

This page provides the complete NPI Profile along with additional information for Michael Huff, a provider established in San Francisco, California with a medical specialization in Substance Abuse Rehabilitation Facility. The healthcare provider is registered in the NPI registry with number 1619171337 assigned on June 2007. The practitioner's primary taxonomy code is 324500000X. The provider is registered as an individual and his NPI record was last updated 7 years ago.

NPI: 1619171337
Provider Name: DR. MICHAEL A HUFF PHD
Gender: Male
Entity Type: Individual
Location Address: 564 6TH ST SAN FRANCISCO, CA 94103
Location Phone: (415) 489-7314
Location Fax: (510) 465-4873
Mailing Address: 564 6TH ST SAN FRANCISCO, CA 94103
Mailing Phone: (454) 489-7315
Is Sole Proprietor?: Yes
Enumeration Date: 06-14-2007
Last Update Date: 11-18-2019
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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: Substance Abuse Rehabilitation Facility
Taxonomy Code: 324500000X
Type: Residential Treatment Facilities
Taxonomy Description: A facility or distinct part of a facility that provides a 24 hr therapeutically planned living and rehabilitative intervention environment for the treatment of individuals with disorders in the abuse of drugs, alcohol, and other substances.

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 1619171337, we treat the final digit (7) 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 7).

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 → 2

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 2

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 1 → 2 1 → 2 1 → 2 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 2 + 9 + 2 + 7 + 2 + 3 + 6 + 24 = 63

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

The next multiple of ten after 63 is 70. The difference is the calculated check digit.

70 - 63 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1619171337.