ALEXANDRA FONTANILLA NP
NPI 1710536628
Nurse Practitioner - Pediatrics in Hayward, CA
NPI Status: Active since September 04, 2019
Contact Information
2620 TRIBUNE AVE
HAYWARD, CA
ZIP 94542
Phone: (510) 862-9022
- Individual
- Female
- Nurse Practitioner
- Pediatrics
About ALEXANDRA FONTANILLA
This page provides the complete NPI Profile along with additional information for Alexandra Fontanilla, a provider established in Hayward, California with a medical specialization in Nurse Practitioner, focusing in pediatrics . The healthcare provider is registered in the NPI registry with number 1710536628 assigned on September 2019. The practitioner's primary taxonomy code is 363LP0200X with license number 95038145 (CA). The provider is registered as an individual and her NPI record was last updated April 2026.
- NPI
- 1710536628
- Provider Name
- ALEXANDRA FONTANILLA NP
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 2620 TRIBUNE AVE HAYWARD, CA 94542
- Location Phone
- (510) 862-9022
- Mailing Address
- 2620 TRIBUNE AVE HAYWARD, CA 94542
- Is Sole Proprietor?
- No
- Enumeration Date
- 09-04-2019
- Last Update Date
- 04-25-2026
- Code Navigator
A nurse practitioner (NP) like Alexandra Fontanilla is an experienced registered nurse with a master’s or doctoral degree and advanced clinical training. Nurse practitioners can work in many different specialties including primary care, pediatrics, cardiology, emergency, women’s health, oncology or geriatrics. Nurse practitioners provide services like physical exams, order laboratory tests, manage diseases, write prescriptions, 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
Nurse Practitioner Pediatrics
- Taxonomy Code
- 363LP0200X
- Type
- Physician Assistants & Advanced Practice Nursing Providers
- License No.
- 95038145
- License State
- CA
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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 1710536628, we treat the final digit (8) 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 52. The final step is to find the difference between that total and the next multiple of ten (60 - 52 = 8).
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 52 is 60. The difference is the calculated check digit.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1710536628, enumerated as an "individual" on September 04, 2019.
The provider is located at 2620 TRIBUNE AVE HAYWARD, CA 94542 and the phone number is (510) 862-9022.
Nurse Practitioner with taxonomy code 363LP0200X and a focus in Pediatrics.
