John Dennis Allendorf, M.D.
Individual provider Active NPI Surgical Oncology Physician · Mineola, NY
NPI 1740364397 · NPPES record last updated May 13, 2026
Key facts
- NPI
- 1740364397
- Entity type
- Individual (NPI type 1)
- Primary specialty
- Surgical Oncology Physician 2086X0206X
- License
- 212487 (NY)
- Practice address
- 120 Mineola Blvd
Suite 320
Mineola, NY 11501-4064 - Phone
- (516) 663-3300
- Fax
- (516) 663-2136
- NPI assigned
- Oct 24, 2006
- Sex
- Male
- Sole proprietor
- Yes
Organizations & group practices 4
Hospital & facility affiliations 10
Medicare Care Compare profile
- Specialty
- General Surgery
- Education
- Columbia University College of Physicians and Surgeons, 1997
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
- New York University
Practice addresses (Care Compare)
111 Broadway
New York, NY 10006-1901
Phone (212) 263-9700
259 1St St
Mineola, NY 11501-3957
Phone (516) 222-8600
297 Mineola Blvd
Mineola, NY 11501-1502
Phone (516) 294-1377
Hospital & facility affiliations
- NYU Langone Home Health Care
- NYU Langone Hospitals
- Long Island Community Hospital
Merit-based Incentive Payment System (MIPS)
- Final score
- 90.8 of 100
- Quality
- 91.79
- Promoting interoperability
- 100
- Improvement activities
- 40
- Cost
- 75.18
Medicare participation
- Medicare fee-for-service enrollment
- Enrolled in NY
- Eligible to order & refer
- Part B services: Yes · DME: Yes · Home health: Yes · Power mobility devices: Yes · Hospice: Yes
Medicare enrollment records
| Enrollment ID | State | Provider type | PAC ID | Details |
|---|---|---|---|---|
| I20101110000330 | NY | Practitioner - General Surgery | 1153516646 | Reassigns benefits to 2 organizations |
National Provider Directory
- Medicare enrollment (NPD)
- Yes
- Credentials
- Doctor of Medicine
State licenses
| License | State | Type | Specialty |
|---|---|---|---|
| 212487 | NY | MD | Surgical Oncology Physician |
Practice roles (4 of 8)
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| New York University | Surgery | Current |
Accepting new patients |
| New York University | Current |
Accepting new patients | |
| Winthrop Community Medical Affiliates PC | Surgery | Past | Accepting new patients |
| Winthrop Surgical Associates, PC | Surgery | Past | Accepting new patients |
Locations
100 Hospital Rd
Ste 115
East Patchogue, NY 11772
Phone (631) 228-5830
1300 Franklin Ave
Ste Ul
Garden City, NY 11530
Phone (516) 663-2224
1300 Franklin Ave
Ste ML6
Garden City, NY 11530
Phone (516) 353-1900
340 W Park Ave
Long Beach, NY 11561
Phone (516) 431-5064
120 Mineola Blvd
Ste 320
Mineola, NY 11501
Phone (516) 663-3300
120 Mineola Blvd
Ste 600
Mineola, NY 11501
Phone (516) 663-4525
13303 Jamaica Ave
#13292
Richmond Hill, NY 11418
Phone (718) 291-3276
13303 Jamaica Ave
Richmond Hill, NY 11418
Phone (718) 206-6942
Networks
- Healthfirst Medicare Network H5989
- Healthfirst Medicare Network H9678
- Healthfirst Medicare Network H3359
- Healthfirst Medicare Network H1722
Interoperability endpoints
- jallendorf230620@nyumc.direct-ci.com
Specialties & licenses
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Surgery Physician | 208600000X | 212487 | NY | |
| Surgical Oncology Physician | 2086X0206X | 212487 | NY | Yes |
Addresses
Primary practice location
120 Mineola Blvd
Suite 320
Mineola, NY 11501-4064
Mailing address
120 Mineola Blvd
Suite 320
Mineola, NY 11501-4064
Phone (516) 663-3300
Other identifiers
| Identifier | Type | State | Issuer |
|---|---|---|---|
| 02288659 | Medicaid | NY |
Electronic endpoints
| Type | Endpoint | Use | Affiliation |
|---|---|---|---|
| CONNECT URL | https://esmd.officeally.io:8291/Gateway/DocumentSubmission/2_0/NhinService/XDRRequest_Service | Other | Bluemark LLC / Office Ally |
| Direct Messaging Address | jallendorf230620@nyumc.direct-ci.com |
Other providers in Mineola, NY
- Sehrish Ali
- Dzifa Alifo
- All About Women Gynecology, P.C.
- M. Baraa Allaf
- Michele C Allan
- Meghan Quigley Allison
- Maria Mercedes Almonte Batista
- John Francis Aloia
- Maria del Consuelo Alonso
- Steven Alper
All providers in Mineola, NY · Surgical Oncology Physician in New York
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Record last updated by the provider on May 13, 2026. Information in NPPES is self-reported and not verified by CMS.
- NUCC Health Care Provider Taxonomy: specialty names.
- Medicare Fee-For-Service Public Provider Enrollment (CMS/PECOS): enrollments, PAC IDs and benefit reassignments.
- Order and Referring (CMS).
- Medicare Care Compare provider data (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.