DR. DENNIS MALCOLM HENDERSON PHD
NPI 1639287758
Psychologist in Gast Northport, NY
About Dr. Dennis Malcolm Henderson Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. DENNIS MALCOLM HENDERSON PHD (NPI 1639287758) is an individual psychologist in Gast Northport, New York, licensed in New York (011792-1) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS and is a graduate of Other (1990).
NPPES Registry Identity
Specialties & Licenses
Other Identifiers 4
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
Dr. Dennis Malcolm Henderson Phd 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 Reassignment
Medicare enrollment records show Dennis Henderson reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
East Northport, NY 11731
- Reassigned Medicare billing, New York enrollment
Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.
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 Dennis Henderson's NPI number?
The NPI number for Dennis Henderson is 1639287758. It was assigned to this individual provider in the NPPES registry on August 28, 2006.
Where is Dennis Henderson located?
Dennis Henderson practices at 12 Gildare Drive, Gast Northport, NY 11731. The listed phone number is (631) 368-8502.
What is Dennis Henderson's specialty?
The primary specialty registered for this NPI is Psychologist with taxonomy code 103T00000X.
Is Dennis Henderson enrolled in Medicare?
Yes. Dennis Henderson 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 organization bills Medicare for Dennis Henderson's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Dennis Henderson reassigns Medicare benefits to Dennis M Henderson Psychological Services PC (East Northport, 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 Dennis Henderson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
When was this NPI record last updated?
The NPPES record for Dennis Henderson was last updated on July 8, 2007. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 19 years 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.