MICHAEL JAY NEFF MD
NPI 1841041910
Emergency Medicine in Dallas, TX

NPI Status: Active since March 28, 2024

Contact Information

5323 HARRY HINES BOULEVARD
DALLAS, TX
ZIP 75390
Phone: (214) 648-3433

Recently Updated NPI Information
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.

Table of Contents

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

Individual
Male
Emergency Medicine

About MICHAEL NEFF

This page provides the complete NPI Profile along with additional information for Michael Neff, a provider established in Dallas, Texas with a medical specialization in Emergency Medicine. The healthcare provider is registered in the NPI registry with number 1841041910 assigned on March 2024. The practitioner's primary taxonomy code is 207P00000X with license number W5467 (TX). The provider is registered as an individual and his NPI record was last updated June 2026.

NPI: 1841041910
Provider Name: MICHAEL JAY NEFF MD
Gender: Male
Entity Type: Individual
Location Address: 5323 HARRY HINES BOULEVARD DALLAS, TX 75390
Location Phone: (214) 648-3433
Mailing Address: 50427 SNOWY CREEK WAY COARSEGOLD, CA 93614
Mailing Phone: (559) 676-9090
Is Sole Proprietor?: No
Enumeration Date: 03-28-2024
Last Update Date: 06-05-2026
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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: Emergency Medicine
Taxonomy Code: 207P00000X
Type: Allopathic & Osteopathic Physicians
License No.: W5467
License State: TX
Taxonomy Description: An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.

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 1841041910, we treat the final digit (0) 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 0).

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 → 8

Pos 4

Unchanged

Pos 5

Doubled → 0

Pos 6

Unchanged

Pos 7

Doubled → 2

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 4 → 8 0 → 0 1 → 2 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 8 + 1 + 0 + 4 + 2 + 9 + 2 + 24 = 60

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

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

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1841041910.