GRIFFIN MICHAEL ELLIS DO
NPI 1316512536
Orthopaedic Surgery - Orthopaedic Surgery of the Spine in Thornton, CO

NPI Status: Active since May 20, 2021

Contact Information

9005 GRANT ST STE 200
THORNTON, CO
ZIP 80229
Phone: (303) 287-2800
Fax: (303) 287-7357

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
NPI Validation
Other Providers Same Location
Frequently Asked Questions

Individual
Male
Orthopaedic Surgery
Orthopaedic Surgery of the Spine

About GRIFFIN ELLIS

This page provides the complete NPI Profile along with additional information for Griffin Ellis, a provider established in Thornton, Colorado with a medical specialization in Orthopaedic Surgery, focusing in orthopaedic surgery of the spine . The healthcare provider is registered in the NPI registry with number 1316512536 assigned on May 2021. The practitioner's primary taxonomy code is 207XS0117X with license number DR.0077587 (CO). The provider is registered as an individual and his NPI record was last updated June 2026.

NPI: 1316512536
Provider Name: GRIFFIN MICHAEL ELLIS DO
Gender: Male
Entity Type: Individual
Location Address: 9005 GRANT ST STE 200 THORNTON, CO 80229
Location Phone: (303) 287-2800
Location Fax: (303) 287-7357
Mailing Address: 9005 GRANT ST STE 200 STE 200 THORNTON, CO 80229
Mailing Phone: (303) 287-2800
Mailing Fax: (303) 287-7357
Is Sole Proprietor?: No
Enumeration Date: 05-20-2021
Last Update Date: 06-11-2026
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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: Orthopaedic Surgery Orthopaedic Surgery of the Spine
Taxonomy Code: 207XS0117X
Type: Allopathic & Osteopathic Physicians
License No.: DR.0077587
License State: CO
Taxonomy Description: Recognized by several state medical boards as a fellowship subspecialty program of orthopaedic surgery, orthopaedic surgeons of the spine deal with the evaluation and nonoperative and operative treatment of the full spectrum of primary spinal disorders including trauma, degenerative, deformity, tumor, and reconstructive.

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 1316512536, we treat the final digit (6) 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 54. The final step is to find the difference between that total and the next multiple of ten (60 - 54 = 6).

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 → 10 → 1 + 0

Pos 6

Unchanged

Pos 7

Doubled → 4

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 5 → 10 → 1 2 → 4 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 2 + 6 + 1 + 0 + 1 + 4 + 5 + 6 + 24 = 54

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

The next multiple of ten after 54 is 60. The difference is the calculated check digit.

60 - 54 = 6

This NPI is valid

The calculated check digit is 6, which matches the last digit of 1316512536.