THEODORE C LO MD
NPI 1821154261
Radiology - Radiation Oncology in Eau Claire, WI

NPI Status: Active since December 29, 2006

Contact Information

900 W CLAIREMONT AVE
EAU CLAIRE, WI
ZIP 54701
Phone: (715) 717-4121

Recently Updated NPI Information
Some details in this NPI profile have been updated in the NPI registry within the last 30 days.

Table of Contents

NPI Profile Information
Primary Taxonomy
Insurance Plans Accepted
Secondary Locations
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Radiology
Radiation Oncology

About THEODORE LO

This page provides the complete NPI Profile along with additional information for Theodore Lo, a provider established in Eau Claire, Wisconsin with a medical specialization in Radiology, focusing in radiation oncology . The healthcare provider is registered in the NPI registry with number 1821154261 assigned on December 2006. The practitioner's primary taxonomy code is 2085R0001X with license number 38023 (MA). The provider is registered as an individual and his NPI record was last updated May 2026.

NPI: 1821154261
Provider Name: THEODORE C LO MD
Gender: Male
Entity Type: Individual
Location Address: 900 W CLAIREMONT AVE EAU CLAIRE, WI 54701
Location Phone: (715) 717-4121
Mailing Address: 41 MALL RD BURLINGTON, MA 01805
Mailing Phone: (781) 744-8000
Mailing Fax
Is Sole Proprietor?: No
Enumeration Date: 12-29-2006
Last Update Date: 05-17-2026
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Location Map

Secondary Locations

41 Mall Rd
Burlington, MA 01805
(781) 744-8000

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: Radiology Radiation Oncology
Taxonomy Code: 2085R0001X
Type: Allopathic & Osteopathic Physicians
License No.: 38023
License State: MA
Taxonomy Description: A radiologist who deals with the therapeutic applications of radiant energy and its modifiers and the study and management of disease, especially malignant tumors.

Insurance Plans Accepted

According to publicly available information the provider might be accepting the following health plans from these health insurance companies:

Medicare

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

Medicaid

Specific plan information not avaialable, please contact the provider to verify if your insurance plan is accepted.

*Please verify directly with this provider to make sure your insurance plan is currently accepted.

Additional Identifiers

The NPI Enumerator encourages providers to submit additional identifiers with their NPI application although the submission of this information is optional. The additional identifier(s) section includes other numbers or codes currently or formerly used as an identifier for the provider by other public healthcare entities. The identifiers may include UPIN, NSC, OSCAR, DEA, Medicaid State or PIN identification numbers.

Identifier	Type / Code	Identifier State	Identifier Issuer
6167241	MEDICAID (05)	MA

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 1821154261, we treat the final digit (1) 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 59. The final step is to find the difference between that total and the next multiple of ten (60 - 59 = 1).

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 → 4

Pos 4

Unchanged

Pos 5

Doubled → 2

Pos 6

Unchanged

Pos 7

Doubled → 8

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 2 → 4 1 → 2 4 → 8 6 → 12 → 3