JOHN MASCARI MD
NPI 1154828507
Pediatrics - Neonatal-Perinatal Medicine in New York, NY
NPI Status: Active since April 11, 2018
Contact Information
1283 YORK AVE
NEW YORK, NY
ZIP 10065
Phone: (646) 697-6428
NPPES record last updated: March 2, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.
Record update history: Mar 2, 2026, Oct 8, 2025, Apr 25, 2022 and 2 more (5 updates tracked since 2018).
- Individual
- Male
- Years of Experience 9
- Pediatrics
- Neonatal-Perinatal Medicine
- May Accept Medicare Approved Payment
- PECOS Enrolled
About JOHN MASCARI
This page provides the complete NPI Profile along with additional information for John Mascari, a pediatrician established in New York, New York with a medical specialization in Pediatrics, focusing in neonatal-perinatal medicine and more than 9 years of experience. He graduated from Geisel School Of Medicine At Dartmouth in 2018. The healthcare provider is registered in the NPI registry with number 1154828507 assigned on April 2018. The practitioner's primary taxonomy code is 2080N0001X with license number 337258 (NY). The provider is registered as an individual and his NPI record was last updated March 2026.
- NPI
- 1154828507
- Provider Name
- JOHN MASCARI MD
- Gender
- Male
- Entity Type
- Individual
- Location Address
- 1283 YORK AVE NEW YORK, NY 10065
- Location Phone
- (646) 697-6428
- Mailing Address
- 1283 YORK AVE NEW YORK, NY 10065
- Medical School Name
- GEISEL SCHOOL OF MEDICINE AT DARTMOUTH
- Graduation Year
- 2018
- Is Sole Proprietor?
- No
- Enumeration Date
- 04-11-2018
- Last Update Date
- 03-02-2026
- Code Navigator
A pediatrician like John Mascari is a physician who has completed a pediatric residency and is board-certified or board-eligible in a pediatric specialty. Pediatric care providers are trained to care for newborns, infants, children and adolescents. A pediatrician could perform physical exams, manage vaccinations, monitor development milestones, diagnose illnesses, infections, injuries or other health problems, 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
Pediatrics Neonatal-Perinatal Medicine
- Taxonomy Code
- 2080N0001X
- Type
- Allopathic & Osteopathic Physicians
- License No.
- 337258
- License State
- NY
- Taxonomy Description
- A pediatrician who is the principal care provider for sick newborn infants. Clinical expertise is used for direct patient care and for consulting with obstetrical colleagues to plan for the care of mothers who have high-risk pregnancies.
Medicare Participation & PECOS Enrollment Status
John Mascari is registered with Medicare but may not accept claims assignment. If you are a Medicare beneficiary call and confirm with the provider before seeking any services.
John Mascari is enrolled in PECOS and is eligible to order or refer health care services for Medicare patients. The provider is eligible to order or refer: Part B Clinical Laboratory and Imaging, Durable Medical Equipment (DME), a Home Health Agency (HHA) and Power Mobility Devices.
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.
Is the provider registered in PECOS? Yes
PECOS PAC ID: 8820573124
What is the PECOS Associate Control ID?
A PAC ID is a unique 10-digit number assigned to an individual or organization healthcare provider in PECOS. The PAC ID is used to link together all the provider information, like tax identification numbers and organizational names. A PAC ID can be connected to multiple Enrollment IDs if an individual or organization has enrolled in PECOS more than once.PECOS Enrollment ID: I20260403000426
What is the Provider Enrollment ID?
The Enrollment ID is a unique alphanumeric 15-digit code assigned to each new provider's PECOS enrollment application. The Enrollment ID is used to link together all the provider enrollment information like enrollment type, state, provider specialty, and reassignment of benefits.Accepts Medicare Assignment? Maybe
What does it mean "accepts medicare assignment"?
When a provider accepts Medicare assignment, the provider agrees to be paid directly by Medicare and to accept the payment amount approved by Medicare. Additionally, the provider agrees to not bill patients for more than the Medicare deductible and coinsurance amounts.
A provider who doesn't accept assignment may charge you up to 15% over the Medicare-approved amount. This is known as the limiting charge. You may have to pay this amount, or it may be covered by another insurer.Eligible to Order or Refer Part B Clinical Laboratory and Imaging: Yes
Eligible to Order or Refer Durable Medical Equipment (DMEPOS): Yes
Eligible to Order or Refer a Home Health Agency (HHA): Yes
Eligible to Order or Refer Power Mobility Devices: Yes
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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 1154828507, 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 53. The final step is to find the difference between that total and the next multiple of ten (60 - 53 = 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 53 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.
NEW YORK, NY 10065
NEW YORK, NY 10065
NEW YORK, NY 10065
NEW YORK, NY 10065
Frequently Asked Questions
The NPI number assigned to this healthcare provider is 1154828507, enumerated as an "individual" on April 11, 2018.
The provider is located at 1283 YORK AVE NEW YORK, NY 10065 and the phone number is (646) 697-6428.
Pediatrics with taxonomy code 2080N0001X and a focus in Neonatal-Perinatal Medicine.
