MARK CRAWFORD BUCHANAN M.D.
NPI 1326379231
Internal Medicine in Farmington, CT

NPI Status: Active since January 18, 2010

Contact Information

263 FARMINGTON AVE
OCCUPATIONAL MEDICINE
FARMINGTON, CT
ZIP 06030
Phone: (860) 679-2893
Fax: (860) 679-4587

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

Individual
Male
Internal Medicine

About MARK BUCHANAN

This page provides the complete NPI Profile along with additional information for Mark Buchanan, an internist established in Farmington, Connecticut with a medical specialization in Internal Medicine. The healthcare provider is registered in the NPI registry with number 1326379231 assigned on January 2010. The practitioner's primary taxonomy code is 207R00000X with license number 037373 (CT). The provider is registered as an individual and his NPI record was last updated 4 years ago.

NPI: 1326379231
Provider Name: MARK CRAWFORD BUCHANAN M.D.
Gender: Male
Entity Type: Individual
Location Address: 263 FARMINGTON AVE OCCUPATIONAL MEDICINE FARMINGTON, CT 06030
Location Phone: (860) 679-2893
Location Fax: (860) 679-4587
Mailing Address: 263 FARMINGTON AVE PROVIDER ENROLLMENT OFFICE FARMINGTON, CT 06030
Mailing Phone: (860) 679-7503
Mailing Fax: (860) 679-4587
Is Sole Proprietor?: No
Enumeration Date: 01-18-2010
Last Update Date: 09-26-2022
Code Navigator

An internist like Mark Buchanan is a physician who has completed an internal medicine residency and is board-certified or board-eligible in an internist specialty. Internists are trained to care for adults of all ages for many different medical conditions. An internist typically monitors chronic physical conditions, identifies acute diseases, provides family planning, provides counseling about wellness and disease prevention, etc.

Location Map

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: Internal Medicine
Taxonomy Code: 207R00000X
Type: Allopathic & Osteopathic Physicians
License No.: 037373
License State: CT
Taxonomy Description: A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

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 1326379231, 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 69. The final step is to find the difference between that total and the next multiple of ten (70 - 69 = 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 → 6

Pos 6

Unchanged

Pos 7

Doubled → 18 → 1 + 8

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 2 → 4 3 → 6 9 → 18 → 9 3 → 6

Step 2: Add all digits plus the NPI constant

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

2 + 3 + 4 + 6 + 6 + 7 + 1 + 8 + 2 + 6 + 24 = 69

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

The next multiple of ten after 69 is 70. The difference is the calculated check digit.

70 - 69 = 1

This NPI is valid

The calculated check digit is 1, which matches the last digit of 1326379231.