HALSEY NILES MD
NPI 1225615057
Psychiatry & Neurology - Psychiatry in Belmont, MA
About Halsey Niles Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
HALSEY NILES MD (NPI 1225615057) is an individual psychiatry provider in Belmont, Massachusetts, licensed in Massachusetts (1016586) and active in the NPI registry since March 2021. He is enrolled in Medicare PECOS, maintains a secondary practice location in Boston, and is a graduate of Yale University School Of Medicine (2021).
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
Halsey Niles 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 Halsey Niles reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Belmont, MA 02478
- Reassigned Medicare billing, Massachusetts enrollment
- 422 clinicians in this Medicare group
Newton, MA 02462
- Reassigned Medicare billing, Massachusetts enrollment
- 992 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.
Physician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02478 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.
BELMONT, MA 02478
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 Halsey Niles's NPI number?
The NPI number for Halsey Niles is 1225615057. It was assigned to this individual provider in the NPPES registry on March 26, 2021.
Where is Halsey Niles located?
Halsey Niles practices at 115 Mill St, Belmont, MA 02478. The listed phone number is (617) 299-9355.
What is Halsey Niles's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.
Is Halsey Niles enrolled in Medicare?
Yes. Halsey Niles 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 Halsey Niles's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Halsey Niles reassigns Medicare benefits to 2 organizations: The Mclean Hospital Corporation (Belmont, MA) and Mass General Brigham Medical Group Suburban Massachusetts Inc (Newton, 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 Halsey Niles's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Halsey Niles accept?
Health plans from Taro Health and WellSense Health Plan list Halsey Niles 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.
When was this NPI record last updated?
The NPPES record for Halsey Niles was last updated on July 26, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.
# Halsey Niles, MD · NPI 1225615057
Psychiatry physician in Belmont, Massachusetts. Individual provider, active in the CMS NPPES registry since March 26, 2021.
## Identity
- **NPI:** 1225615057 (Entity type: Individual)
- **Enumerated:** March 26, 2021
- **Primary specialty:** Psychiatry & Neurology - Psychiatry · taxonomy 2084P0800X
- **State license:** 1016586 (Massachusetts)
- **Sole proprietor:** Yes
## Practice location
- **Address:** 115 MILL ST, Belmont, MA 02478-1048
- **Phone:** (617) 299-9355
## 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): The Mclean Hospital Corporation (NPI 1114979580, Belmont, MA); Mass General Brigham Medical Group Suburban Massachusetts Inc (NPI 1538191218, Newton, MA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Yale University School Of Medicine, class of 2021
## Record status
- **NPPES last updated:** July 26, 2025
---
Source: [NPI Profile](https://npiprofile.com/npi/1225615057) · Data from the CMS NPPES public registry.