GILLIAN RUTH DIERCKS M.D.
NPI 1255573515
Otolaryngology - Pediatric Otolaryngology in Boston, MA
About Gillian Ruth Diercks M.d. NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
GILLIAN RUTH DIERCKS M.D. (NPI 1255573515) is an individual pediatric otolaryngology provider in Boston, Massachusetts, licensed in Massachusetts (266714) and active in the NPI registry since April 2009. She is enrolled in Medicare PECOS, is affiliated with Newton-wellesley Hospital, and is a graduate of Columbia University College Of Physicians And Surgeons (2009).
NPPES Registry Identity
Specialties & Licenses 2
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
Gillian Ruth Diercks M.d. 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 Gillian Diercks reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 478 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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Newton-Wellesley Hospital
Acute Care Hospitals · Newton, 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.
BOSTON, MA 02114
BOSTON, MA 02114
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 Gillian Diercks's NPI number?
The NPI number for Gillian Diercks is 1255573515. It was assigned to this individual provider in the NPPES registry on April 1, 2009.
Where is Gillian Diercks located?
Gillian Diercks practices at 243 Charles St, Boston, MA 02114. The listed phone number is (617) 573-3190.
What is Gillian Diercks's specialty?
The primary specialty registered for this NPI is Otolaryngology, specializing in Pediatric Otolaryngology, with taxonomy code 207YP0228X.
Is Gillian Diercks enrolled in Medicare?
Yes. Gillian Diercks 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 Gillian Diercks's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Gillian Diercks reassigns Medicare benefits to Massachusetts Eye And Ear Associates, Inc. (Boston, MA). 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 Gillian Diercks's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Gillian Diercks accept?
Health plans from Anthem Blue Cross and Blue Shield list Gillian Diercks 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 Gillian Diercks affiliated with any hospitals?
According to CMS data, Gillian Diercks is affiliated with Newton-Wellesley Hospital.
When was this NPI record last updated?
The NPPES record for Gillian Diercks was last updated on November 8, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Gillian Ruth Diercks, M.D. · NPI 1255573515
Pediatric Otolaryngology physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since April 1, 2009.
## Identity
- **NPI:** 1255573515 (Entity type: Individual)
- **Enumerated:** April 1, 2009
- **Primary specialty:** Otolaryngology - Pediatric Otolaryngology · taxonomy 207YP0228X
- **State license:** 266714 (Massachusetts)
- **Sole proprietor:** No
## Practice location
- **Address:** 243 CHARLES ST, Boston, MA 02114-3002
- **Phone:** (617) 573-3190
## 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:** Massachusetts Eye And Ear Associates, Inc. (NPI 1932574332, Boston, MA), under Medicare reassignment (form CMS-855R) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Columbia University College Of Physicians And Surgeons, class of 2009
## Record status
- **NPPES last updated:** November 8, 2023
---
Source: [NPI Profile](https://npiprofile.com/npi/1255573515) · Data from the CMS NPPES public registry.