TERESA MASTROIANNI FNP
NPI 1295533537
Nurse Practitioner - Family in Natick, MA
NPI Status: Active since March 04, 2025
Contact Information
117 W CENTRAL ST
NATICK, MA
ZIP 01760
Phone: (508) 566-5943
- Individual
- Female
- Nurse Practitioner
- Family
- Opted-Out Medicare
About TERESA MASTROIANNI
This page provides the complete NPI Profile along with additional information for Teresa Mastroianni, a provider established in Natick, Massachusetts with a medical specialization in Nurse Practitioner, focusing in family . The healthcare provider is registered in the NPI registry with number 1295533537 assigned on March 2025. The practitioner's primary taxonomy code is 363LF0000X with license number RN2333998 (MA). The provider is registered as an individual and her NPI record was last updated one year ago.
- NPI
- 1295533537
- Provider Name
- TERESA MASTROIANNI FNP
- Gender
- Female
- Entity Type
- Individual
- Location Address
- 117 W CENTRAL ST NATICK, MA 01760
- Location Phone
- (508) 566-5943
- Mailing Address
- 580 E BROADWAY APT 2 SOUTH BOSTON, MA 02127
- Mailing Phone
- (508) 566-5943
- Is Sole Proprietor?
- Yes
- Enumeration Date
- 03-04-2025
- Last Update Date
- 04-01-2025
- Code Navigator
A nurse practitioner (NP) like Teresa Mastroianni 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.
The provider doesn't accept Medicare and has signed an affidavit to be excluded from the Medicare program. If you are a Medicare beneficiary this means a provider can charge whatever they want for services rendered but must follow certain rules to do so. Teresa Mastroianni opted out of Medicare effective on 03-28-2025 until 03-28-2027. Opt out periods last for two years and cannot be terminated unless the provider is opting out for the very first time and the affidavit is terminated no later than 90 days after the opt out effective date. Opt-out affidavits might renew automatically renew every two years. The provider opted out of Medicare and cannot order and refer services to other healthcare providers.
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 Family
- Taxonomy Code
- 363LF0000X
- Type
- Physician Assistants & Advanced Practice Nursing Providers
- License No.
- RN2333998
- License State
- MA
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 | 390200000X | Student, Health Care | Student in an Organized Health Care Education/Training Program |
Medicare Participation & PECOS Enrollment Status
What is PECOS?
PECOS is the online Medicare enrollment management system or Provider, Enrollment, Chain and Ownership System. The PECOS system is a database of providers who have registered with CMS as providers or suppliers. PECOS is the primary source of information about verified Medicare professionals. Providers that want to participate in this program need to enroll in PECOS with their NPI number to avoid denied claims.
Opted-Out of Medicare? Yes
Opt-Out Effective Date: 03-28-2025
Opt-Out End Date: 03-28-2027
Eligible to Order and Refer? No
Reviews for TERESA MASTROIANNI FNP
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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 1295533537, 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 6 providers are registered at the same or a nearby location.
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1295533537, enumerated as an "individual" on March 04, 2025.
The provider is located at 117 W CENTRAL ST NATICK, MA 01760 and the phone number is (508) 566-5943.
Nurse Practitioner with taxonomy code 363LF0000X and a focus in Family.
