MRS. LARISA ANN GILLERN PHYSICIAN ASSISTANT
NPI 1639793557
Physician Assistant - Surgical in Greenwich, CT
NPI Status: Active since June 05, 2020
Contact Information
5 PERRYRIDGE RD
GREENWICH, CT
ZIP 06830
Phone: (203) 863-3000
- Individual
- Female
- Physician Assistant
- Surgical
About LARISA GILLERN
This page provides the complete NPI Profile along with additional information for Larisa Gillern, a provider established in Greenwich, Connecticut with a medical specialization in Physician Assistant, focusing in surgical . The healthcare provider is registered in the NPI registry with number 1639793557 assigned on June 2020. The practitioner's primary taxonomy code is 363AS0400X. The provider is registered as an individual and her NPI record was last updated one year ago.
- NPI
- 1639793557
- Provider Name
- MRS. LARISA ANN GILLERN PHYSICIAN ASSISTANT
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 5 PERRYRIDGE RD GREENWICH, CT 06830
- Location Phone
- (203) 863-3000
- Mailing Address
- 74 OCEAN AVE MILFORD, CT 06460
- Mailing Phone
- (203) 979-4882
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-05-2020
- Last Update Date
- 10-14-2025
- Code Navigator
Location Map
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 Surgical
- Taxonomy Code
- 363AS0400X
- Type
- Physician Assistants & Advanced Practice Nursing Providers
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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 1639793557, 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 73. The final step is to find the difference between that total and the next multiple of ten (80 - 73 = 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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 73 is 80. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
GREENWICH, CT 06830
GREENWICH, CT 06830
GREENWICH, CT 06830
GREENWICH, CT 06830
GREENWICH, CT 06830
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1639793557, enumerated as an "individual" on June 05, 2020.
The provider is located at 5 PERRYRIDGE RD GREENWICH, CT 06830 and the phone number is (203) 863-3000.
Physician Assistant with taxonomy code 363AS0400X and a focus in Surgical.
