Active NPI
Hassan Shaheed Greenidge, PA
- Physician Assistant
- Hempstead, NY
National Provider Identifier
1801435748
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Physician Assistant
- Practice address
- 577 Fulton Ave Apt 2H
Hempstead, NY 11550-4365 - Phone
- (516) 670-6161
- NPI assigned
- Dec 23, 2019
- Sex
- Male
- Sole proprietor
- Yes
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 2
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Medical Physician Assistant | 363AM0700X | 25MP00682200 | NJ | |
| Physician Assistant | 363A00000X | NY | Primary |
Addresses
Primary practice location
577 Fulton Ave Apt 2H
Hempstead, NY 11550-4365
Mailing address
577 Fulton Ave Apt 2H
Hempstead, NY 11550-4365
Phone (516) 670-6161
Other practice location 1
1 Diamond Hill Rd
Berkeley Heights, NJ 07922-2104
Phone (516) 783-4600
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in NY, CT, NJ
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: No
Enrollment records 3
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20200325000138 | NY | Practitioner - Physician Assistant | 2466880471 | Reassigns benefits to 6 organizations |
| I20241120000570 | CT | Practitioner - Physician Assistant | 2466880471 | Reassigns benefits to 1 organization |
| I20260130000127 | NJ | Practitioner - Physician Assistant | 2466880471 | Reassigns benefits to 1 organization |
Care Compare profile
Medicare Care Compare- Specialty
- Physician Assistant
- Education
- Other, 2019
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
- City Medical of Upper East Side PLLC
Practice addresses (Care Compare)
336 E 86TH St
New York, NY 10028-4615
Phone (212) 772-3627
Hospital & facility affiliations
- NYU Langone Hospitals
Merit-based Incentive Payment System (MIPS)
- Final score
- 90.8 of 100
- Quality
- 91.79
- Promoting interoperability
- 100
- Improvement activities
- 40
- Cost
- 75.18
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Physician Assistant
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 25MP00682200 | NJ | MD | Medical Physician Assistant |
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| New York University | Current | Accepting new patients | |
| Mercy Medical Center | Current | Accepting new patients | |
| Mercy Medical Center | Current | Accepting new patients | |
| City Medical of Upper East Side, PLLC | Current | Accepting new patients | |
| City Medical of Upper East Side, PLLC | Current | Accepting new patients | |
| Summit Medical Group PA | Current | Accepting new patients | |
| City Medical of Upper East Side, PLLC | Current | Accepting new patients | |
| Summit Medical Group PA | Current | Accepting new patients | |
| New York University | Current | Accepting new patients |
Locations
506 Westport Ave
Norwalk, CT 06851
Phone (203) 706-4170
1 Diamond Hill Rd
Berkeley Heights, NJ 07922
Phone (908) 277-8868
3111 Steinway St
Astoria, NY 11103
Phone (718) 475-2345
4295 Hempstead Tpke
Bethpage, NY 11714
Phone (516) 520-2250
1345 Avenue of the Americas
Fl 8
New York, NY 10105
Phone (212) 913-0828
336 E 86th St
New York, NY 10028
Phone (212) 772-3627
1000 N Village Ave
Rockville Ctr, NY 11570
Phone (516) 705-1012
14 Wall St
Fl 9
Wall Street, NY 10005
Phone (646) 501-3224
Interoperability endpoints
- hassan.greenidge.1@2983.direct.athenahealth.com
Organizations & group practices 15
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Urgent Care Clinic/Center
- Bayside, NY
- NPI 1790412443
-
- Multi-Specialty Clinic/Center
- New York, NY
- NPI 1174089056
-
- Urgent Care Clinic/Center
- New York, NY
- NPI 1740913763
-
- Internal Medicine Physician
- Rockville Centre, NY
- NPI 1104097294
Hospital & facility affiliations 7
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1577059200000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1768521600000",
"number": "1801435748",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "577 FULTON AVE APT 2H",
"city": "HEMPSTEAD",
"state": "NY",
"postal_code": "115504365",
"telephone_number": "516-670-6161"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "577 FULTON AVE APT 2H",
"city": "HEMPSTEAD",
"state": "NY",
"postal_code": "115504365",
"telephone_number": "516-670-6161"
}
],
"practiceLocations": [
{
"address_1": "1 Diamond Hill Rd",
"address_purpose": "LOCATION",
"city": "Berkeley Heights",
"state": "NJ",
"postal_code": "079222104",
"country_code": "US",
"telephone_number": "516-783-4600",
"country_name": "United States",
"address_type": "DOM"
}
],
"basic": {
"last_name": "GREENIDGE",
"first_name": "HASSAN",
"middle_name": "SHAHEED",
"name_prefix": "Mr.",
"credential": "PA",
"sole_proprietor": "YES",
"sex": "M",
"enumeration_date": "2019-12-23",
"last_updated": "2026-01-16",
"certification_date": "2026-01-16",
"status": "A"
},
"taxonomies": [
{
"code": "363AM0700X",
"taxonomy_group": "",
"desc": "Physician Assistant, Medical",
"state": "NJ",
"license": "25MP00682200",
"primary": false
},
{
"code": "363A00000X",
"taxonomy_group": "",
"desc": "Physician Assistant",
"state": "NY",
"license": null,
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Hempstead, NY
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Jan 16, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.