RICHARD LOUIS LEFF M.D.
NPI 1639374820
Internal Medicine - Rheumatology in Chadds Ford, PA
NPI Status: Active since June 18, 2007
Contact Information
230 FAIRVILLE RD
CHADDS FORD, PA
ZIP 19317
Phone: (610) 388-7623
- Individual
- Male
- Internal Medicine
- Rheumatology
About RICHARD LEFF
This page provides the complete NPI Profile along with additional information for Richard Leff, an internist established in Chadds Ford, Pennsylvania with a medical specialization in Internal Medicine, focusing in rheumatology . The healthcare provider is registered in the NPI registry with number 1639374820 assigned on June 2007. The practitioner's primary taxonomy code is 207RR0500X with license number MD072738L (PA). The provider is registered as an individual and his NPI record was last updated 19 years ago.
- NPI
- 1639374820
- Provider Name
- RICHARD LOUIS LEFF M.D.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 230 FAIRVILLE RD CHADDS FORD, PA 19317
- Location Phone
- (610) 388-7623
- Mailing Address
- 230 FAIRVILLE RD CHADDS FORD, PA 19317
- Mailing Phone
- (610) 388-7623
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 06-18-2007
- Last Update Date
- 07-08-2007
- Code Navigator
An internist like Richard Leff 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 Rheumatology
- Taxonomy Code
- 207RR0500X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- MD072738L
- License State
- PA
- Taxonomy Description
- An internist who treats diseases of joints, muscle, bones and tendons. This specialist diagnoses and treats arthritis, back pain, muscle strains, common athletic injuries and collagen diseases.
Reviews for RICHARD LOUIS LEFF M.D.
There are currently no reviews for this provider. Be the first person to share your experience with this provider by filling out our review form. Your insights are appreciated and will help others make informed decisions.
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 1639374820, we treat the final digit (0) 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 80. The final step is to find the difference between that total and the next multiple of ten (80 - 80 = 0).
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 80 is 80. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1639374820, enumerated as an "individual" on June 18, 2007.
The provider is located at 230 FAIRVILLE RD CHADDS FORD, PA 19317 and the phone number is (610) 388-7623.
Internal Medicine with taxonomy code 207RR0500X and a focus in Rheumatology.
