THOMAS DALFONSO JR.
NPI 1538020409
Physician Assistant - Medical in Philadelphia, PA
NPI Status: Active since November 20, 2025
Contact Information
1 CONVENTION AVE
PHILADELPHIA, PA
ZIP 19104
Phone: (215) 662-4000
- Individual
- Male
- Physician Assistant
- Medical
About THOMAS DALFONSO
This page provides the complete NPI Profile along with additional information for Thomas Dalfonso, a primary care provider established in Philadelphia, Pennsylvania with a medical specialization in Physician Assistant, focusing in medical . The healthcare provider is registered in the NPI registry with number 1538020409 assigned on November 2025. The practitioner's primary taxonomy code is 363AM0700X. The provider is registered as an individual and his NPI record was last updated one year ago.
- NPI
- 1538020409
- Provider Name
- THOMAS DALFONSO JR.
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1 CONVENTION AVE PHILADELPHIA, PA 19104
- Location Phone
- (215) 662-4000
- Mailing Address
- 1 CONVENTION AVE PHILADELPHIA, PA 19104
- Mailing Phone
- (215) 662-4000
- Is Sole Proprietor?
- No
- Enumeration Date
- 11-20-2025
- Last Update Date
- 11-20-2025
- Code Navigator
A primary care provider (PCP) like Thomas Dalfonso sees people with common medical problems. The primary care provider might be a doctor, physician assistant, nurse practitioner or clinic that are usually involved in your long-term care. A PCP might provide preventive care, treat common medical conditions, identify urgent medical problems and refer you to specialists when necessary. Primary care is usually provided in an outpatient facility but if you are admitted to a hospital your PCP may assist in your care. The most common medical conditions seen by primary care providers are: hypertension, upper respiratory tract infections, depression or anxiety, back pain, arthritis, dermatitis, diabetes, urinary tract infections, 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
Physician Assistant Medical
- Taxonomy Code
- 363AM0700X
- Type
- Physician Assistants & Advanced Practice Nursing Providers
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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 1538020409, we treat the final digit (9) 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 51. The final step is to find the difference between that total and the next multiple of ten (60 - 51 = 9).
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 51 is 60. 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.
PHILADELPHIA, PA 19104
PHILADELPHIA, PA 19104
PHILADELPHIA, PA 19104
PHILADELPHIA, PA 19104
PHILADELPHIA, PA 19104
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1538020409, enumerated as an "individual" on November 20, 2025.
The provider is located at 1 CONVENTION AVE PHILADELPHIA, PA 19104 and the phone number is (215) 662-4000.
Physician Assistant with taxonomy code 363AM0700X and a focus in Medical.
