DR. JOHN T CHANCE M.D.
NPI 1790785624
Orthopaedic Surgery - Hand Surgery in Portland, ME

NPI Status: Active since July 21, 2005

Contact Information

33 SEWALL ST
PORTLAND, ME
ZIP 04102
Phone: (207) 828-2100
Fax: (207) 828-2190

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

Individual
Male
Orthopaedic Surgery
Hand Surgery

About JOHN CHANCE

This page provides the complete NPI Profile along with additional information for John Chance, a provider established in Portland, Maine with a medical specialization in Orthopaedic Surgery, focusing in hand surgery . The healthcare provider is registered in the NPI registry with number 1790785624 assigned on July 2005. The practitioner's primary taxonomy code is 207XS0106X with license number 013254 (ME). The provider is registered as an individual and his NPI record was last updated 8 years ago.

NPI: 1790785624
Provider Name: DR. JOHN T CHANCE M.D.
Gender: Male
Entity Type: Individual
Location Address: 33 SEWALL ST PORTLAND, ME 04102
Location Phone: (207) 828-2100
Location Fax: (207) 828-2190
Mailing Address: 324 GANNETT DR STE 200 SOUTH PORTLAND, ME 04106
Mailing Phone: (207) 482-7800
Mailing Fax: (207) 828-2190
Is Sole Proprietor?: No
Enumeration Date: 07-21-2005
Last Update Date: 09-18-2018
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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 Hand Surgery
Taxonomy Code: 207XS0106X
Type: Allopathic & Osteopathic Physicians
License No.: 013254
License State: ME
Taxonomy Description: An orthopaedic surgeon trained in the investigation, preservation and restoration by medical, surgical and rehabilitative means of all structures of the upper extremity directly affecting the form and function of the hand and wrist.

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 1790785624, we treat the final digit (4) 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 66. The final step is to find the difference between that total and the next multiple of ten (70 - 66 = 4).

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 → 10 → 1 + 0

Pos 8

Unchanged

Pos 9

Doubled → 4

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 5 → 10 → 1 2 → 4

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 + 8 + 1 + 0 + 6 + 4 + 24 = 66

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

The next multiple of ten after 66 is 70. The difference is the calculated check digit.

70 - 66 = 4

This NPI is valid

The calculated check digit is 4, which matches the last digit of 1790785624.