DR. JONATHAN ALAN MCMAHAN PHARMD
NPI 1821191727
Pharmacist - Pharmacotherapy in Saint Louis, MO
NPI Status: Active since September 06, 2006
Contact Information
915 N GRAND BLVD
SAINT LOUIS, MO
ZIP 63106
Phone: (314) 652-4100
- Individual
- Male
- Pharmacist
- Pharmacotherapy
About JONATHAN MCMAHAN
This page provides the complete NPI Profile along with additional information for Jonathan Mcmahan, a provider established in Saint Louis, Missouri with a medical specialization in Pharmacist, focusing in pharmacotherapy . The healthcare provider is registered in the NPI registry with number 1821191727 assigned on September 2006. The practitioner's primary taxonomy code is 1835P1200X with license number 26022022A (IN). The provider is registered as an individual and his NPI record was last updated March 2026.
- NPI
- 1821191727
- Provider Name
- DR. JONATHAN ALAN MCMAHAN PHARMD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 915 N GRAND BLVD SAINT LOUIS, MO 63106
- Location Phone
- (314) 652-4100
- Mailing Address
- 915 N GRAND BLVD SAINT LOUIS, MO 63106
- Mailing Phone
- (314) 652-4100
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 09-06-2006
- Last Update Date
- 03-20-2026
- Code Navigator
A pharmacist like Jonathan Mcmahan fills prescription medications, verifying instructions from physicians and offers expertise in the safe use of prescriptions. Pharmacists instruct patients on how to take a prescribed medicine and educate patients about potential side effects. Pharmacists might also conduct health and wellness screenings, provide immunizations, oversee the medications given to patients, and provide advice on healthy lifestyles.
Location Map
Secondary Locations
- 1 Jefferson Barracks Dr
Saint Louis, MO 63125
(314) 652-4100
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
Pharmacist Pharmacotherapy
- Taxonomy Code
- 1835P1200X
- Type
- Pharmacy Service Providers
- License No.
- 26022022A
- License State
- IN
- Taxonomy Description
- A licensed pharmacist who has demonstrated specialized knowledge and skill in optimizing pharmacotherapeutic care of patients, by developing, implementing, monitoring, and modifying complex treatment plans, providing advanced level education and consultation, and collaborating with other health professionals in the management of therapy.
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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 1821191727, we treat the final digit (7) 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 63. The final step is to find the difference between that total and the next multiple of ten (70 - 63 = 7).
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 63 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.
SAINT LOUIS, MO 63106
SAINT LOUIS, MO 63106
SAINT LOUIS, MO 63106
SAINT LOUIS, MO 63106
SAINT LOUIS, MO 63106
SAINT LOUIS, MO 63106
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1821191727, enumerated as an "individual" on September 06, 2006.
The provider is located at 915 N GRAND BLVD SAINT LOUIS, MO 63106 and the phone number is (314) 652-4100.
Pharmacist with taxonomy code 1835P1200X and a focus in Pharmacotherapy.
