CARRIE JOHNSTON PT, DPT
NPI 1851765457
Physical Therapist - Geriatrics in San Diego, CA

NPI Status: Active since November 19, 2015

Contact Information

13101 HARTFIELD AVE
SAN DIEGO, CA
ZIP 92130
Phone: (858) 834-0601

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

Individual
Female
Physical Therapist
Geriatrics

About CARRIE JOHNSTON

This page provides the complete NPI Profile along with additional information for Carrie Johnston, a provider established in San Diego, California with a medical specialization in Physical Therapist, focusing in geriatrics . The healthcare provider is registered in the NPI registry with number 1851765457 assigned on November 2015. The practitioner's primary taxonomy code is 2251G0304X with license number 41909 (CA). The provider is registered as an individual and her NPI record was last updated 11 years ago.

NPI: 1851765457
Provider Name: CARRIE JOHNSTON PT, DPT
Gender: Female
Entity Type: Individual
Location Address: 13101 HARTFIELD AVE SAN DIEGO, CA 92130
Location Phone: (858) 834-0601
Mailing Address: 13101 HARTFIELD AVE SAN DIEGO, CA 92130
Mailing Phone: (858) 834-0601
Is Sole Proprietor?: No
Enumeration Date: 11-19-2015
Last Update Date: 11-19-2015
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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.: 41909
License State: CA
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 1851765457, we treat the final digit (7) 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 7).

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 → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 10 → 1 + 0

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 7 → 14 → 5 5 → 10 → 1 5 → 10 → 1

Step 2: Add all digits plus the NPI constant

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

2 + 8 + 1 + 0 + 1 + 1 + 4 + 6 + 1 + 0 + 4 + 1 + 0 + 24 = 53

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

The next multiple of ten after 53 is 60. The difference is the calculated check digit.

60 - 53 = 7

This NPI is valid

The calculated check digit is 7, which matches the last digit of 1851765457.