MR. RICHARD IRVING LUDWIG JR. LDO
NPI 1407723760
Technician/Technologist - Optician in Dorchester, MA

NPI Status: Active since October 21, 2025

Contact Information

636 COLUMBIA RD
DORCHESTER, MA
ZIP 02125
Phone: (617) 825-9839

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

Individual
Male
Technician/Technologist
Optician

About RICHARD LUDWIG

This page provides the complete NPI Profile along with additional information for Richard Ludwig, a provider established in Dorchester, Massachusetts with a medical specialization in Technician/technologist, focusing in optician . The healthcare provider is registered in the NPI registry with number 1407723760 assigned on October 2025. The practitioner's primary taxonomy code is 156FX1800X with license number 6363 (MA). The provider is registered as an individual and his NPI record was last updated one year ago.

NPI: 1407723760
Provider Name: MR. RICHARD IRVING LUDWIG JR. LDO
Gender: Male
Entity Type: Individual
Location Address: 636 COLUMBIA RD DORCHESTER, MA 02125
Location Phone: (617) 825-9839
Mailing Address: 80 W COTTAGE ST APT 1 DORCHESTER, MA 02125
Is Sole Proprietor?: No
Enumeration Date: 10-21-2025
Last Update Date: 10-21-2025
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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: Technician/Technologist Optician
Taxonomy Code: 156FX1800X
Type: Eye and Vision Services Providers
License No.: 6363
License State: MA
Taxonomy Description: Opticians help fit eyeglasses and contact lenses, following prescriptions from Ophthalmologists and Optometrists. They also help customers decide which eyeglass frame or contact lenses to buy.

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 1407723760, 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 60. The final step is to find the difference between that total and the next multiple of ten (60 - 60 = 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 → 0

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

Pos 6

Unchanged

Pos 7

Doubled → 6

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 0 → 0 7 → 14 → 5 3 → 6 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 4 + 0 + 7 + 1 + 4 + 2 + 6 + 7 + 1 + 2 + 24 = 60

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

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

60 - 60 = 0

This NPI is valid

The calculated check digit is 0, which matches the last digit of 1407723760.