DR. STEVEN DEAN PORTER O.D.
NPI 1295947745
Optometrist in Portland, OR

NPI Status: Active since May 04, 2007

Contact Information

4849 NE 138TH AVE
PORTLAND, OR
ZIP 97230
Phone: (503) 256-7940
Fax: (503) 256-7940

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

Individual
Male
Optometrist

About STEVEN PORTER

This page provides the complete NPI Profile along with additional information for Steven Porter, a provider established in Portland, Oregon with a medical specialization in Optometrist. The healthcare provider is registered in the NPI registry with number 1295947745 assigned on May 2007. The practitioner's primary taxonomy code is 152W00000X with license number 1723T (OR). The provider is registered as an individual and his NPI record was last updated 19 years ago.

NPI: 1295947745
Provider Name: DR. STEVEN DEAN PORTER O.D.
Other Name: STEVEN DEAN PORTER O.D.
Other Name Type: Former Name (1)
Gender: Male
Entity Type: Individual
Location Address: 4849 NE 138TH AVE PORTLAND, OR 97230
Location Phone: (503) 256-7940
Location Fax: (503) 256-7940
Mailing Address: 302 E SHERIDAN ST NEWBERG, OR 97132
Mailing Phone: (503) 256-7940
Mailing Fax: (503) 256-7940
Is Sole Proprietor?: Yes
Enumeration Date: 05-04-2007
Last Update Date: 07-08-2007
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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: Optometrist
Taxonomy Code: 152W00000X
Type: Eye and Vision Services Providers
License No.: 1723T
License State: OR
Taxonomy Description: Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

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 1295947745, we treat the final digit (5) 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 75. The final step is to find the difference between that total and the next multiple of ten (80 - 75 = 5).

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 → 18 → 1 + 8

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 14 → 1 + 4

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 9 → 18 → 9 9 → 18 → 9 7 → 14 → 5 4 → 8

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 1 + 8 + 5 + 1 + 8 + 4 + 1 + 4 + 7 + 8 + 24 = 75

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

The next multiple of ten after 75 is 80. The difference is the calculated check digit.

80 - 75 = 5

This NPI is valid

The calculated check digit is 5, which matches the last digit of 1295947745.