DAVID PAUL JOHNSON MSPT
NPI 1255995312
Physical Therapist - Geriatrics in Allentown, PA

NPI Status: Active since April 24, 2019

Contact Information

707 HAMILTON ST FL 4
ALLENTOWN, PA
ZIP 18101
Phone: (484) 862-3001
Fax: (484) 862-3013

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

Individual
Male
Physical Therapist
Geriatrics

About DAVID JOHNSON

This page provides the complete NPI Profile along with additional information for David Johnson, a provider established in Allentown, Pennsylvania with a medical specialization in Physical Therapist, focusing in geriatrics . The healthcare provider is registered in the NPI registry with number 1255995312 assigned on April 2019. The practitioner's primary taxonomy code is 2251G0304X with license number PT013576L (PA). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1255995312
Provider Name: DAVID PAUL JOHNSON MSPT
Gender: Male
Entity Type: Individual
Location Address: 707 HAMILTON ST FL 4 ALLENTOWN, PA 18101
Location Phone: (484) 862-3001
Location Fax: (484) 862-3013
Mailing Address: 707 HAMILTON ST FL 4 ALLENTOWN, PA 18101
Mailing Phone: (484) 862-3001
Mailing Fax: (484) 862-3013
Is Sole Proprietor?: Yes
Enumeration Date: 04-24-2019
Last Update Date: 05-26-2026
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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 Geriatrics
Taxonomy Code: 2251G0304X
Type: Respiratory, Developmental, Rehabilitative and Restorative Service Providers
License No.: PT013576L
License State: PA
Taxonomy Description: A licensed physical therapist, including but not limited to an individual who is a Board Certified Specialist in Geriatric Physical Therapy, who has demonstrated specialized knowledge and skill in the comprehensive biopsychosocial assessment and evidence-based management of movement in aging adults. This includes, but is not limited to, specialized knowledge in and consideration of normal age-related changes and pathological manifestations across all systems; cognition and mental health; polypharmacy; fall risk mitigation; bone health; healthy and active aging, and socioeconomic and health policy issues affecting aging adults. The geriatric physical therapist is an integral part of the interdisciplinary geriatric team and serves as an advocate for the highest level of well-being for the older adult.

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 1255995312, 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 58. The final step is to find the difference between that total and the next multiple of ten (60 - 58 = 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 → 10 → 1 + 0

Pos 4

Unchanged

Pos 5

Doubled → 18 → 1 + 8

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

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 5 → 10 → 1 9 → 18 → 9 5 → 10 → 1 1 → 2

Step 2: Add all digits plus the NPI constant

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

2 + 2 + 1 + 0 + 5 + 1 + 8 + 9 + 1 + 0 + 3 + 2 + 24 = 58

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

The next multiple of ten after 58 is 60. The difference is the calculated check digit.

60 - 58 = 2

This NPI is valid

The calculated check digit is 2, which matches the last digit of 1255995312.