John Grassi, PA
NPI 1457471450 · Emergency Medicine Physician · Manhasset, NY
Enrolled with Medicare as Practitioner - Physician Assistant · source: CMS PECOS Public Provider Enrollment (2026.04.01)
John Grassi, PA is a Emergency Medicine Physician provider in Manhasset, NY (NPI 1457471450).
Provider details
- NPI number
- 1457471450
- Entity type
- Individual
- Primary specialty
- Emergency Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- PA
- Sex
- Male
- Sole proprietor
- Yes
- License
- 006579 (NY)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
624 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213 | 274 | $88 |
| Detection Test By Immunoassay With Direct Visual Observation for Influenza Virus87804 | 82 | $16 |
| Detection Test By Immunoassay With Direct Visual Observation for Severe Acute Respiratory Syndrome Coronavirus 2 (covid-19)87811 | 75 | $41 |
| Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214 | 61 | $124 |
| Automated Urinalysis Test81003 | 41 | $2 |
| Detection Test By Immunoassay With Direct Visual Observation for Streptococcus, Group a (strep)87880 |
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 10 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Amoxicillin | 53 | 52 |
| Methylprednisolone | 40 | 39 |
| Nitrofurantoin Monohyd/M-Crystbrand: Nitrofurantoin Mono-Macro | 30 | 28 |
| Azithromycin | 22 | 22 |
| Doxycycline Hyclate | 21 | 20 |
| Polymyxin B Sulf/Trimethoprimbrand: Polymyxin B Sul-Trimethoprim | 16 | 16 |
| Prednisone | 16 | 16 |
Practice location
Mailing address
Registry dates
- Enumerated
- 2007-03-31
- Last updated
- 2007-07-08
Frequently asked questions
- What is John Grassi's NPI number?
- John Grassi's National Provider Identifier (NPI) is 1457471450, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is John Grassi's specialty?
- John Grassi is listed in the NPPES registry with a primary specialty of Emergency Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is John Grassi located?
- John Grassi's practice location on file with NPPES is 300 Community Dr, Manhasset, NY 11030-3816.
- What is John Grassi's phone number?
- The practice phone number listed in the NPPES registry for John Grassi is (516) 562-3090.
- Does John Grassi accept Medicare?
- John Grassi is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is John Grassi's NPI active?
- Yes — John Grassi's NPI (1457471450) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.