Diane Grassi, NP
Adult Health Nurse Practitioner · Smithtown, NY
Diane Grassi, NP is an adult health nurse practitioner with a practice address in Smithtown, New York, and NPI 1063917136, issued on Mar 29, 2018. Check the license (New York F308295-1, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Diane Grassi
- Credential
- NP
- Primary taxonomy
- Adult Health Nurse Practitioner 363LA2200X
- License number
- F308295-1 NY
Self-reported in NPPES; status is on the state search - Practice location
- 285 E Main St, Smithtown, NY 11787
- Phone
- (631) 656-0874
- Enumerated
- Mar 29, 2018
- Record last updated
- Jan 7, 2019 (not updated in 7 years: call before relying on the address or phone)
- Medicare enrollment
- Enrolled (PECOS I20180706001592); accepts Medicare assignment
- Medical or professional school
- State University Of New York At Stony Brook, School Of Medicine, 2016
- Entity
- Type 1 · individual
8 nearest adult health nurse practitioner records → All 6,028 in New York → Look up another NPI →
Also registered at 285 E Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Diane Grassi in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license F308295-1Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Industry payments in 2024: $63.98
3 payments; by number, the most common kind was food and beverage; the largest payer was Abbott Laboratories. The 12,291 providers of this specialty with any payment received $946.40 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- North Shore-Lij Medical PCNew Hyde Park, NY
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Diane Grassi among 6,028 adult health nurse practitioner records in New York
Diane Grassi, NP is one of 6,028 adult health nurse practitioner records with a practice address in New York. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2018, is newer than 66% of them.
- NPI issued2018 · 66% of these records are older, 30% newer
- In a Medicare fileYes · 69% of these records are
- In the CMS Doctors and Clinicians fileYes · 44% of these records are
- Graduated2016 · median 2016 among the 2,678 with a school on file
- Record last updated2019 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LA2200X and a New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
49 adult health nurse practitioner records list a practice address in Smithtown
They are 49 of the 1,907 NPPES records with a practice address in Smithtown, and 6,028 adult health nurse practitioner records in New York.
All 6,028 in New York → Every provider in Smithtown → Adult Health Nurse Practitioner nationwide →
The 8 adult health nurse practitioner records with the nearest ZIP codes
- Marilyn AlterSmithtown, NY 117871316039530
- Carole Capparelli, ANPSmithtown, NY 117871083790364
- Stacey Cedeno, ANPSmithtown, NY 117871184749053
- Anna ChiramannilSmithtown, NY 117871194817320
- Valerie GraySmithtown, NY 117871497976542
- Jennifer Grella, APRN,BCSmithtown, NY 117871164527164
- Nina Gresser-TacettaSmithtown, NY 117871689766818
- Jo Ann Jacquemain, ANP-CSmithtown, NY 117871154511954
Common questions
What is Diane Grassi, NP's NPI number?
Diane Grassi, NP's National Provider Identifier (NPI) is 1063917136, issued on Mar 29, 2018. An NPI identifies a provider in billing; it is not a license.
Where is Diane Grassi, NP located?
The NPPES record lists a practice address at 285 E Main St, Smithtown, NY, 11787. Phone: (631) 656-0874. Providers update this record themselves, so call before visiting.
How can I verify Diane Grassi, NP's license?
NPPES lists New York license number F308295-1, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.