DR. BRIAN GREENFIELD DPT
NPI 1366397960
Physical Therapist - Neurology in Chicago, IL

NPI Status: Active since February 28, 2026

Contact Information

1401 S CALIFORNIA AVE
CHICAGO, IL
ZIP 60608
Phone: (773) 522-2010

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

Individual
Male
Physical Therapist
Neurology

About BRIAN GREENFIELD

This page provides the complete NPI Profile along with additional information for Brian Greenfield, a provider established in Chicago, Illinois with a medical specialization in Physical Therapist, focusing in neurology . The healthcare provider is registered in the NPI registry with number 1366397960 assigned on February 2026. The practitioner's primary taxonomy code is 2251N0400X with license number 070.022519 (IL). The provider is registered as an individual and his NPI record was last updated February 2026.

NPI: 1366397960
Provider Name: DR. BRIAN GREENFIELD DPT
Gender: Male
Entity Type: Individual
Location Address: 1401 S CALIFORNIA AVE CHICAGO, IL 60608
Location Phone: (773) 522-2010
Mailing Address: 1401 S CALIFORNIA AVE RM 2703 CHICAGO, IL 60608
Is Sole Proprietor?: No
Enumeration Date: 02-28-2026
Last Update Date: 02-28-2026
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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: Physical Therapist Neurology
Taxonomy Code: 2251N0400X
Type: Respiratory, Developmental, Rehabilitative and Restorative Service Providers
License No.: 070.022519
License State: IL
Taxonomy Description: A licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Neurologic Physical Therapy, who has demonstrated specialized knowledge and skill in neuroanatomy and neurophysiology, including knowledge of central, peripheral, and autonomic nervous systems in populations with and without neurologic conditions; motor control and movement sciences in populations with and without neurologic conditions; behavioral sciences, including psychology and neuropsychology, and psychiatry; and medical management and pharmacology.

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 1366397960, 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 70. The final step is to find the difference between that total and the next multiple of ten (70 - 70 = 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 → 12 → 1 + 2

Pos 4

Unchanged

Pos 5

Doubled → 6

Pos 6

Unchanged

Pos 7

Doubled → 14 → 1 + 4

Pos 8

Unchanged

Pos 9

Doubled → 12 → 1 + 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 6 → 12 → 3 3 → 6 7 → 14 → 5 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 1 + 2 + 6 + 6 + 9 + 1 + 4 + 9 + 1 + 2 + 24 = 70

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

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

70 - 70 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1366397960.