MR. MICHAEL EUGENE CALLAHAN PA-C
NPI 1467480673
Internal Medicine - Gastroenterology in Decatur, GA
NPI Status: Active since June 28, 2006
Contact Information
1670 CLAIRMONT RD
ATLANTA VA MEDICAL CENTER
DECATUR, GA
ZIP 30033
Phone: (404) 321-6111
- Individual
- Male
- Internal Medicine
- Gastroenterology
About MICHAEL CALLAHAN
This page provides the complete NPI Profile along with additional information for Michael Callahan, an internist established in Decatur, Georgia with a medical specialization in Internal Medicine, focusing in gastroenterology . The healthcare provider is registered in the NPI registry with number 1467480673 assigned on June 2006. The practitioner's primary taxonomy code is 207RG0100X with license number 3240 (GA). The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1467480673
- Provider Name
- MR. MICHAEL EUGENE CALLAHAN PA-C
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1670 CLAIRMONT RD ATLANTA VA MEDICAL CENTER DECATUR, GA 30033
- Location Phone
- (404) 321-6111
- Mailing Address
- 3220 FRANCINE DR DECATUR, GA 30033
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-28-2006
- Last Update Date
- 09-11-2025
- Code Navigator
An internist like Michael Callahan 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 Gastroenterology
- Taxonomy Code
- 207RG0100X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 3240
- License State
- GA
- Taxonomy Description
- An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.
Secondary Taxonomies
The provider has reported to the NPI enumerator additional taxonomy codes. Multiple taxonomy codes may represent subspecialties or other areas of specialization the provider maybe licensed to practice.
| No. | Taxonomy Code | Type | Classification / Specialization |
License No. (State) |
|---|---|---|---|---|
| 1 | 363AM0700X | Physician Assistants & Advanced Practice Nursing Providers | Physician Assistant | 3240 (GA) |
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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 1467480673, we treat the final digit (3) 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 67. The final step is to find the difference between that total and the next multiple of ten (70 - 67 = 3).
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.
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.
Step 2: Add all digits plus the NPI constant
Add the transformed values, the unchanged digits, and the constant 24.
Step 3: Find the amount needed to reach the next multiple of 10
The next multiple of ten after 67 is 70. The difference is the calculated check digit.
Other Providers at the Same Location
The following 20 providers are registered at the same or a nearby location.
DECATUR, GA 30033
DECATUR, GA 30033
DECATUR, GA 30033
DECATUR, GA 30033
DECATUR, GA 30033
DECATUR, GA 30033
DECATUR, GA 30033
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1467480673, enumerated as an "individual" on June 28, 2006.
The provider is located at 1670 CLAIRMONT RD ATLANTA VA MEDICAL CENTER DECATUR, GA 30033 and the phone number is (404) 321-6111.
Internal Medicine with taxonomy code 207RG0100X and a focus in Gastroenterology.
