DR. MARIA DEL PILAR TRELLES THORNE MD
NPI 1558505891
Psychiatry & Neurology - Child & Adolescent Psychiatry in Boston, MA
About Dr. Maria Del Pilar Trelles Thorne Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. MARIA DEL PILAR TRELLES THORNE MD (NPI 1558505891) is an individual child & adolescent psychiatry provider in Boston, Massachusetts, licensed in Massachusetts (1017239) and active in the NPI registry since April 2009. She is enrolled in Medicare PECOS.
NPPES Registry Identity
Specialties & Licenses
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare (PECOS)
Dr. Maria Del Pilar Trelles Thorne Md is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).
Medicare Billing Reassignments
2Medicare enrollment records show Maria Del Pilar Trelles Thorne reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02115
- Reassigned Medicare billing, Massachusetts enrollment
- 86 clinicians in this Medicare group
New York, NY 10029
- Reassigned Medicare billing, New York enrollment
- 385 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.
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.
BOSTON, MA 02115
BOSTON, MA 02115
BOSTON, MA 02115
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 Maria Del Pilar Trelles Thorne's NPI number?
The NPI number for Maria Del Pilar Trelles Thorne is 1558505891. It was assigned to this individual provider in the NPPES registry on April 30, 2009.
Where is Maria Del Pilar Trelles Thorne located?
Maria Del Pilar Trelles Thorne practices at 300 Longwood Ave, Boston, MA 02115. The listed phone number is (617) 355-4600.
What is Maria Del Pilar Trelles Thorne's specialty?
The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Child & Adolescent Psychiatry, with taxonomy code 2084P0804X.
Is Maria Del Pilar Trelles Thorne enrolled in Medicare?
Yes. Maria Del Pilar Trelles Thorne is registered in the Medicare PECOS enrollment system.
Which organizations bill Medicare for Maria Del Pilar Trelles Thorne's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Maria Del Pilar Trelles Thorne reassigns Medicare benefits to 2 organizations: Richmond Psychiatry Group Practice (Boston, MA) and Icahn School Of Medicine At Mount Sinai (New York, NY). 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 Maria Del Pilar Trelles Thorne's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Maria Del Pilar Trelles Thorne accept?
Health plans from Anthem Blue Cross and Blue Shield and Harvard Pilgrim Health Care list Maria Del Pilar Trelles Thorne 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 Maria Del Pilar Trelles Thorne was last updated on March 29, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.
# Dr. Maria Del Pilar Trelles Thorne, MD · NPI 1558505891
Child & Adolescent Psychiatry physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 30, 2009.
## Identity
- **NPI:** 1558505891 (Entity type: Individual)
- **Enumerated:** April 30, 2009
- **Primary specialty:** Psychiatry & Neurology - Child & Adolescent Psychiatry · taxonomy 2084P0804X
- **State license:** 1017239 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 300 LONGWOOD AVE, Boston, MA 02115-5724
- **Phone:** (617) 355-4600
## 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:** 2 organizations under Medicare reassignment (form CMS-855R): Richmond Psychiatry Group Practice (NPI 1629148036, Boston, MA); Icahn School Of Medicine At Mount Sinai (NPI 1033482518, New York, NY) · CMS Revalidation Reassignment List, October 2026 release
## Record status
- **NPPES last updated:** March 29, 2024
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Source: [NPI Profile](https://npiprofile.com/npi/1558505891) · Data from the CMS NPPES public registry.