MICHAEL DAC NGUYEN
NPI 1538981089
Physician Assistant in Salem, OR

NPI Status: Active since October 28, 2024

Contact Information

875 OAK ST SE STE 4030
SALEM, OR
ZIP 97301
Phone: (503) 561-6444
Fax: (503) 561-6440

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

Individual
Male
Physician Assistant

About MICHAEL NGUYEN

This page provides the complete NPI Profile along with additional information for Michael Nguyen, a primary care provider established in Salem, Oregon with a medical specialization in Physician Assistant. The healthcare provider is registered in the NPI registry with number 1538981089 assigned on October 2024. The practitioner's primary taxonomy code is 363A00000X. The provider is registered as an individual and his NPI record was last updated January 2026. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization.

NPI: 1538981089
Provider Name: MICHAEL DAC NGUYEN
Gender: Male
Entity Type: Individual
Location Address: 875 OAK ST SE STE 4030 SALEM, OR 97301
Location Phone: (503) 561-6444
Location Fax: (503) 561-6440
Mailing Address: 875 OAK ST SE STE 4030 SALEM, OR 97301
Mailing Phone: (503) 561-6444
Mailing Fax: (503) 561-6440
Is Sole Proprietor?: Yes
Enumeration Date: 10-28-2024
Last Update Date: 01-31-2026
Code Navigator

A primary care provider (PCP) like Michael Nguyen sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, etc .

Location Map

Secondary Locations

2700 SE Stratus Ave Ste A
McMinnville, OR 97128
(503) 435-6590
1475 Mount Hood Ave Ste 135
Woodburn, OR 97071
(503) 561-6444

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: Physician Assistant
Taxonomy Code: 363A00000X
Type: Physician Assistants & Advanced Practice Nursing Providers
License State: OR
Taxonomy Description: A physician assistant is a person who has successfully completed an accredited education program for physician assistant, is licensed by the state and is practicing within the scope of that license. Physician assistants are formally trained to perform many of the routine, time-consuming tasks a physician can do. In some states, they may prescribe medications. They take medical histories, perform physical exams, order lab tests and x-rays, and give inoculations. Most states require that they work under the supervision of a physician.

Group Taxonomy 193400000X SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

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 1538981089, 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 → 6

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 16 → 1 + 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 3 → 6 9 → 18 → 9 1 → 2 8 → 16 → 7

Step 2: Add all digits plus the NPI constant

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

2 + 5 + 6 + 8 + 1 + 8 + 8 + 2 + 0 + 1 + 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 1538981089.