DR. ELIZABETH JOANNE HERSKOVITS CASTILLO MD PHD
NPI 1932176443
Internal Medicine - Geriatric Medicine in Boston, MA
About Dr. Elizabeth Joanne Herskovits Castillo Md Phd NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. ELIZABETH JOANNE HERSKOVITS CASTILLO MD PHD (NPI 1932176443) is an individual geriatric medicine provider in Boston, Massachusetts, licensed in Maine (MD22347) and active in the NPI registry since March 2006. She is enrolled in Medicare PECOS, is affiliated with Cape Cod Hospital, and maintains a secondary practice location in East Sandwich.
NPPES Registry Identity
Specialties & Licenses 3
Other Names 1
Secondary Practice Location 1
Other Identifiers 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
Dr. Elizabeth Joanne Herskovits Castillo Md 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 Reassignments
3Medicare enrollment records show Elizabeth Castillo reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,360 clinicians in this Medicare group
Boston, MA 02114
- Reassigned Medicare billing, Massachusetts enrollment
- 6,234 clinicians in this Medicare group
York, ME 03909
- Reassigned Medicare billing, Maine enrollment
- 347 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.
Areas of Expertise CMS Part B claims 4
Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.
Hospital Affiliations CMS Care Compare 4
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Cape Cod Hospital
Acute Care Hospitals · Hyannis, MABeth Israel Deaconess Medical Center
Acute Care Hospitals · Boston, MABrigham And Women's Hospital
Acute Care Hospitals · Boston, MAFalmouth Hospital
Acute Care Hospitals · Falmouth, MAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 02114 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
Medicare Quality Performance CMS QPP · MIPS
Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.
Referred Medical Equipment & Supplies CMS DME claims 4
Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.
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 02114
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 Elizabeth Castillo's NPI number?
The NPI number for Elizabeth Castillo is 1932176443. It was assigned to this individual provider in the NPPES registry on March 2, 2006. The provider is also known as Elizabeth J. Herskovits MD.
Where is Elizabeth Castillo located?
Elizabeth Castillo practices at 55 Fruit St, Boston, MA 02114. The listed phone number is (617) 726-2000.
What is Elizabeth Castillo's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.
Is Elizabeth Castillo enrolled in Medicare?
Yes. Elizabeth Castillo 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 Elizabeth Castillo's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Elizabeth Castillo reassigns Medicare benefits to 3 organizations: Massachusetts General Physicians Organization Inc (Boston, MA), The General Hospital Corporation (Boston, MA) and York Hospital (York, ME). 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 Elizabeth Castillo's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Elizabeth Castillo accept?
Health plans from Anthem Blue Cross and Blue Shield list Elizabeth Castillo 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 Elizabeth Castillo affiliated with any hospitals?
According to CMS data, Elizabeth Castillo is affiliated with Cape Cod Hospital, Beth Israel Deaconess Medical Center, Brigham And Women's Hospital and Falmouth Hospital.
When was this NPI record last updated?
The NPPES record for Elizabeth Castillo was last updated on February 9, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.
# Dr. Elizabeth Joanne Herskovits Castillo, MD PHD · NPI 1932176443
Geriatric Medicine physician in Boston, Massachusetts. Individual provider, active in the CMS NPPES registry since March 2, 2006.
## Identity
- **NPI:** 1932176443 (Entity type: Individual)
- **Enumerated:** March 2, 2006
- **Primary specialty:** Internal Medicine - Geriatric Medicine · taxonomy 207RG0300X
- **State license:** MD22347 (Maine)
- **Sole proprietor:** No
## Practice location
- **Address:** 55 FRUIT ST, Boston, MA 02114-2621
- **Phone:** (617) 726-2000
## 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:** 3 organizations under Medicare reassignment (form CMS-855R): Massachusetts General Physicians Organization Inc (NPI 1801874573, Boston, MA); The General Hospital Corporation (NPI 1023049236, Boston, MA); York Hospital (NPI 1376528398, York, ME) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, San Francisco School Of Medicine, class of 2002
## Record status
- **NPPES last updated:** February 9, 2026
- **Other identifiers:** Medicaid 1932176443 (ME)
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Source: [NPI Profile](https://npiprofile.com/npi/1932176443) · Data from the CMS NPPES public registry.