NICHOLAS TSITSILIANOS MD
NPI 1386200780
Physical Medicine & Rehabilitation in Worcester, MA
About Nicholas Tsitsilianos Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
NICHOLAS TSITSILIANOS MD (NPI 1386200780) is an individual physical medicine & rehabilitation provider in Worcester, Massachusetts, licensed in Massachusetts (1020916) and active in the NPI registry since May 2019. He is enrolled in Medicare PECOS, is affiliated with Umass Memorial Healthalliance Hospitals, and is a graduate of Other (2019).
NPPES Registry Identity
Specialties & Licenses 3
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
Nicholas Tsitsilianos Md 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 Nicholas Tsitsilianos reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Worcester, MA 01655
- Reassigned Medicare billing, Massachusetts enrollment
- 2,902 clinicians in this Medicare group
Wellesley, MA 02481
- Reassigned Medicare billing, Massachusetts enrollment
- 3 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.
Hospital Affiliations CMS Care Compare 5
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Umass Memorial Healthalliance Hospitals
Acute Care Hospitals · Leominster, MAUmass Memorial Health - Harrington Hospital
Acute Care Hospitals · Southbridge, MAMilford Regional Medical Center
Acute Care Hospitals · Milford, MAUmass Memorial Medical Center/University Campus
Acute Care Hospitals · Worcester, MASt Vincent Hospital
Acute Care Hospitals · Worcester, MAOther Providers at the Same Location NPPES 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
WORCESTER, MA 01608
WORCESTER, MA 01608
WORCESTER, MA 01608
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 Nicholas Tsitsilianos's NPI number?
The NPI number for Nicholas Tsitsilianos is 1386200780. It was assigned to this individual provider in the NPPES registry on May 13, 2019.
Where is Nicholas Tsitsilianos located?
Nicholas Tsitsilianos practices at 123 Summer St, Worcester, MA 01608. The listed phone number is (508) 363-5000.
What is Nicholas Tsitsilianos's specialty?
The primary specialty registered for this NPI is Physical Medicine & Rehabilitation with taxonomy code 208100000X.
Is Nicholas Tsitsilianos enrolled in Medicare?
Yes. Nicholas Tsitsilianos 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 Nicholas Tsitsilianos's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Nicholas Tsitsilianos reassigns Medicare benefits to 2 organizations: Umass Memorial Medical Group Inc (Worcester, MA) and Boston Sports & Spine LLC (Wellesley, MA). 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 Nicholas Tsitsilianos's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Nicholas Tsitsilianos accept?
Health plans from Taro Health list Nicholas Tsitsilianos 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 Nicholas Tsitsilianos affiliated with any hospitals?
According to CMS data, Nicholas Tsitsilianos is affiliated with Umass Memorial Healthalliance Hospitals, Umass Memorial Health - Harrington Hospital, Milford Regional Medical Center, Umass Memorial Medical Center/University Campus and St Vincent Hospital.
When was this NPI record last updated?
The NPPES record for Nicholas Tsitsilianos was last updated on October 5, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 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.