TOVAH FOSS
NPI 1518811538
Registered Nurse - Ambulatory Care in Portland, ME

NPI Status: Active since February 25, 2026

Contact Information

141 W COMMERCIAL ST
PORTLAND, ME
ZIP 04102
Phone: (207) 623-8411

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

Individual
Registered Nurse
Ambulatory Care

About TOVAH FOSS

This page provides the complete NPI Profile along with additional information for Tovah Foss, a provider established in Portland, Maine operating as a Registered Nurse, focusing in ambulatory care . The healthcare provider is registered in the NPI registry with number 1518811538 assigned on February 2026. The practitioner's primary taxonomy code is 163WP2201X with license number RN72573 (ME). The provider is registered as an individual and their NPI record was last updated February 2026.

NPI: 1518811538
Provider Name: TOVAH FOSS
Gender
Entity Type: Individual
Location Address: 141 W COMMERCIAL ST PORTLAND, ME 04102
Location Phone: (207) 623-8411
Mailing Address: 141 W COMMERCIAL ST PORTLAND, ME 04102
Is Sole Proprietor?: Yes
Enumeration Date: 02-25-2026
Last Update Date: 02-25-2026
Code Navigator

A registered nurse (RN) like Tovah Foss coordinates and provides patient care and educates patients about various health conditions. Registered nurses give advice and emotional support to patients and their families. The typical duties of a registered nurse include: assessing patient conditions, record medical histories and symptoms, observe patients and record the observations, administer medicines and treatments, consult and collaborate with doctors, operate and monitor medical equipment, teach patients and families how to manage injuries or illnesses, etc.

Registered nurses typically work as part of a team with physicians and other healthcare professionals. In some medical teams registered nurses supervise nursing assistants, licensed practical nurses, and home health aides.

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: Registered Nurse Ambulatory Care
Taxonomy Code: 163WP2201X
Type: Nursing Service Providers
License No.: RN72573
License State: ME

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 1518811538, we treat the final digit (8) 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 62. The final step is to find the difference between that total and the next multiple of ten (70 - 62 = 8).

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 → 2

Pos 4

Unchanged

Pos 5

Doubled → 16 → 1 + 6

Pos 6

Unchanged

Pos 7

Doubled → 2

Pos 8

Unchanged

Pos 9

Doubled → 6

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 1 → 2 8 → 16 → 7 1 → 2 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 5 + 2 + 8 + 1 + 6 + 1 + 2 + 5 + 6 + 24 = 62

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

The next multiple of ten after 62 is 70. The difference is the calculated check digit.

70 - 62 = 8

This NPI is valid

The calculated check digit is 8, which matches the last digit of 1518811538.