MITCHELL LONG DO
NPI 1164876231
Orthopaedic Surgery in West Islip, NY
About Mitchell Long Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MITCHELL LONG DO (NPI 1164876231) is an individual orthopaedic surgery provider in West Islip, New York, licensed in New York (322584) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS, is affiliated with Nassau University Medical Center, and maintains a secondary practice location in Port Jefferson.
NPPES Registry Identity
Specialties & Licenses 2
Secondary Practice Location 1
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Mitchell Long Do is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignment
Medicare enrollment records show Mitchell Long reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
East Meadow, NY 11554
- Reassigned Medicare billing, New York enrollment
- 553 clinicians in this Medicare group
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
Areas of Expertise CMS Part B claims 5
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Nassau University Medical Center
Acute Care Hospitals · East Meadow, NYMount Sinai South Nassau
Acute Care Hospitals · Oceanside, NYPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11795 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Other Providers at the Same Location NPPES 4
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WEST ISLIP, NY 11795
WEST ISLIP, NY 11795
Frequently Asked Questions NPPES & CMS
Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.
What is Mitchell Long's NPI number?
The NPI number for Mitchell Long is 1164876231. It was assigned to this individual provider in the NPPES registry on April 14, 2016.
Where is Mitchell Long located?
Mitchell Long practices at 1175 Montauk Hwy Ste 3, West Islip, NY 11795. The listed phone number is (631) 500-9400.
What is Mitchell Long's specialty?
The primary specialty registered for this NPI is Orthopaedic Surgery with taxonomy code 207X00000X.
Is Mitchell Long enrolled in Medicare?
Yes. Mitchell Long is registered in the Medicare PECOS enrollment system.
Which organization bills Medicare for Mitchell Long's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mitchell Long reassigns Medicare benefits to Nassau Health Care Corporation (East Meadow, NY). The reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Mitchell Long's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Mitchell Long affiliated with any hospitals?
According to CMS data, Mitchell Long is affiliated with Nassau University Medical Center and Mount Sinai South Nassau.
When was this NPI record last updated?
The NPPES record for Mitchell Long was last updated on October 29, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 7 days ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.
# Mitchell Long, DO · NPI 1164876231
Orthopaedic Surgery physician in West Islip, New York. Individual provider, active in the CMS NPPES registry since April 14, 2016.
## Identity
- **NPI:** 1164876231 (Entity type: Individual)
- **Enumerated:** April 14, 2016
- **Primary specialty:** Orthopaedic Surgery · taxonomy 207X00000X
- **State license:** 322584 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1175 MONTAUK HWY STE 3, West Islip, NY 11795-4939
- **Phone:** (631) 500-9400 · **Fax:** (631) 500-9444
## Medicare
- **Medicare:** Enrolled in Medicare (PECOS)
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** Nassau Health Care Corporation (NPI 1003832098, East Meadow, NY), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Des Moines University Of Osteopathic Medicine And Health Sciences, class of 2016
## Record status
- **NPPES last updated:** October 29, 2026
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Source: [NPI Profile](https://npiprofile.com/npi/1164876231) · Data from the CMS NPPES public registry.