DOUGLAS W. FREEMAN MD
NPI 1609954312
Otolaryngology in Roseville, CA

NPI Status: Active since November 01, 2006

Contact Information

3 MEDICAL PLAZA DR
SUITE 220
ROSEVILLE, CA
ZIP 95661
Phone: (916) 773-7923
Fax: (916) 733-7921

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

Individual
Male
Otolaryngology

About DOUGLAS FREEMAN

This page provides the complete NPI Profile along with additional information for Douglas Freeman, a provider established in Roseville, California with a medical specialization in Otolaryngology. The healthcare provider is registered in the NPI registry with number 1609954312 assigned on November 2006. The practitioner's primary taxonomy code is 207Y00000X with license number G44462 (CA). The provider is registered as an individual and his NPI record was last updated 11 years ago.

NPI: 1609954312
Provider Name: DOUGLAS W. FREEMAN MD
Gender: Male
Entity Type: Individual
Location Address: 3 MEDICAL PLAZA DR SUITE 220 ROSEVILLE, CA 95661
Location Phone: (916) 773-7923
Location Fax: (916) 733-7921
Mailing Address: 10470 OLD PLACERVILLE RD SUITE 100 SACRAMENTO, CA 95827
Mailing Phone: (800) 470-0071
Is Sole Proprietor?: No
Enumeration Date: 11-01-2006
Last Update Date: 05-18-2015
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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: Otolaryngology
Taxonomy Code: 207Y00000X
Type: Allopathic & Osteopathic Physicians
License No.: G44462
License State: CA
Taxonomy Description: An otolaryngologist-head and neck surgeon provides comprehensive medical and surgical care for patients with diseases and disorders that affect the ears, nose, throat, the respiratory and upper alimentary systems and related structures of the head and neck. An otolaryngologist diagnoses and provides medical and/or surgical therapy or prevention of diseases, allergies, neoplasms, deformities, disorders and/or injuries of the ears, nose, sinuses, throat, respiratory and upper alimentary systems, face, jaws and the other head and neck systems. Head and neck oncology, facial plastic and reconstructive surgery and the treatment of disorders of hearing and voice are fundamental areas of expertise.

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 1609954312, we treat the final digit (2) 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 68. The final step is to find the difference between that total and the next multiple of ten (70 - 68 = 2).

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 → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 8

Pos 8

Unchanged

Pos 9

Doubled → 2

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 9 → 18 → 9 4 → 8 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 6 + 0 + 9 + 1 + 8 + 5 + 8 + 3 + 2 + 24 = 68

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

The next multiple of ten after 68 is 70. The difference is the calculated check digit.

70 - 68 = 2

This NPI is valid

The calculated check digit is 2, which matches the last digit of 1609954312.