X-RAY MEDICAL GROUP RADIATION ONCOLOGY INC
NPI 1790724565
Radiology - Radiation Oncology in La Mesa, CA

NPI Status: Active since June 06, 2006

Contact Information

5555 GROSSMONT CENTER DR
LA MESA, CA
ZIP 91942
Phone: (619) 740-4500
Fax: (619) 740-8499

NPI Profile Information
Primary Taxonomy
Group Taxonomy
Secondary Locations
Authorized Official
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Organization
Radiology
Radiation Oncology

About X-RAY MEDICAL GROUP RADIATION ONCOLOGY INC

This page provides the complete NPI Profile along with additional information for X-ray Medical Group Radiation Oncology Inc, a provider established in La Mesa, California operating as a Radiology, focusing in radiation oncology . The healthcare provider is registered in the NPI registry with number 1790724565 assigned on June 2006. The practitioner's primary taxonomy code is 2085R0001X. The provider is registered as an organization and their NPI record was last updated February 2026. The organization operates as a Single Specialty Group with one or more individual practitioners, all of who practice with the same area of specialization. The authorized official of this NPI record is Kelly Dewitt Md (Authorized Official)

NPI: 1790724565
Provider Name: X-RAY MEDICAL GROUP RADIATION ONCOLOGY INC
Entity Type: Organization
Location Address: 5555 GROSSMONT CENTER DR LA MESA, CA 91942
Location Phone: (619) 740-4500
Location Fax: (619) 740-8499
Mailing Address: PO BOX 509015 DEPT 338 SAN DIEGO, CA 92150
Is Sole Proprietor?: No
Is Organization Subpart?: No
Enumeration Date: 06-06-2006
Last Update Date: 02-17-2026
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Location Map

Secondary Locations

7901 Frost St
San Diego, CA 92123
(858) 939-5010
769 Medical Center Ct
Chula Vista, CA 91911
(619) 502-5851

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
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.

Group Taxonomy 193400000X MULTIPLE SINGLE SPECIALTY GROUP

This provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.

Authorized Official

The authorized official is the designated individual with the legal authority to make changes to the provider’s official NPI record. For organizations, the authorized official must be a general partner, chairman of the board, CEO, CFO or a direct owner holding at least a 5 percent stake in the medical organization.

Authorized Official Name: KELLY DEWITT MD
Authorized Official Title: AUTHORIZED OFFICIAL
Authorized Official Phone: (619) 740-4500

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 1790724565, we treat the final digit (5) 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 65. The final step is to find the difference between that total and the next multiple of ten (70 - 65 = 5).

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 → 18 → 1 + 8

Pos 4

Unchanged

Pos 5

Doubled → 14 → 1 + 4

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 9 → 18 → 9 7 → 14 → 5 4 → 8 6 → 12 → 3

Step 2: Add all digits plus the NPI constant

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

2 + 7 + 1 + 8 + 0 + 1 + 4 + 2 + 8 + 5 + 1 + 2 + 24 = 65

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

The next multiple of ten after 65 is 70. The difference is the calculated check digit.

70 - 65 = 5

This NPI is valid

The calculated check digit is 5, which matches the last digit of 1790724565.