MICHAEL GHIASSI DO
NPI 1255950440
Internal Medicine in Riverhead, NY
About Michael Ghiassi Do NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAEL GHIASSI DO (NPI 1255950440) is an individual internal medicine provider in Riverhead, New York, licensed in New York (322416) and active in the NPI registry since April 2020. He is enrolled in Medicare PECOS, is affiliated with Lansdale Hospital, and maintains a secondary practice location in Philadelphia.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Michael Ghiassi Do is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.
Medicare Billing Reassignments
2Medicare enrollment records show Michael Ghiassi reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Morrisville, PA 19067
- Reassigned Medicare billing, Pennsylvania enrollment
- 490 clinicians in this Medicare group
Abington, PA 19001
- Reassigned Medicare billing, Pennsylvania enrollment
- 167 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 2
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.
Lansdale Hospital
Acute Care Hospitals · Lansdale, PAJefferson Health- Northeast
Acute Care Hospitals · Philadelphia, PAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 11901 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
RIVERHEAD, NY 11901
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 Michael Ghiassi's NPI number?
The NPI number for Michael Ghiassi is 1255950440. It was assigned to this individual provider in the NPPES registry on April 8, 2020.
Where is Michael Ghiassi located?
Michael Ghiassi practices at 1 Heroes Way, Riverhead, NY 11901. The listed phone number is (631) 548-6000.
What is Michael Ghiassi's specialty?
The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.
Is Michael Ghiassi enrolled in Medicare?
Yes. Michael Ghiassi is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.
Which organizations bill Medicare for Michael Ghiassi's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michael Ghiassi reassigns Medicare benefits to 2 organizations: Aria Health Physician Services (Morrisville, PA) and Abington Memorial Hospital (Abington, PA). Each 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 Michael Ghiassi's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Michael Ghiassi accept?
Health plans from Ambetter Health, Ambetter Health of Delaware and Ambetter from Buckeye Health Plan list Michael Ghiassi as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Michael Ghiassi affiliated with any hospitals?
According to CMS data, Michael Ghiassi is affiliated with Lansdale Hospital and Jefferson Health- Northeast.
When was this NPI record last updated?
The NPPES record for Michael Ghiassi was last updated on February 4, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 months 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.
# Michael Ghiassi, DO · NPI 1255950440
Internal Medicine physician in Riverhead, New York. Individual provider, active in the CMS NPPES registry since April 8, 2020.
## Identity
- **NPI:** 1255950440 (Entity type: Individual)
- **Enumerated:** April 8, 2020
- **Primary specialty:** Internal Medicine · taxonomy 207R00000X
- **State license:** 322416 (New York)
- **Sole proprietor:** No
## Practice location
- **Address:** 1 HEROES WAY, Riverhead, NY 11901-2058
- **Phone:** (631) 548-6000
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Aria Health Physician Services (NPI 1023329679, Morrisville, PA); Abington Memorial Hospital (NPI 1770508319, Abington, PA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Lincoln Memorial University Medical Department, class of 2019
## Record status
- **NPPES last updated:** February 4, 2025
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Source: [NPI Profile](https://npiprofile.com/npi/1255950440) · Data from the CMS NPPES public registry.