Elizabeth Joanne Herskovits Castillo, MD PHD
Geriatric Medicine (Internal Medicine) Physician · Boston, MA
Elizabeth Joanne Herskovits Castillo, MD PHD is a geriatric medicine (internal medicine) physician with a practice address in Boston, Massachusetts, and NPI 1932176443, issued on Mar 2, 2006. Check the license on the Massachusetts Board of Registration in Medicine; the Medicare figures below come from public CMS files.
- Name
- Elizabeth Joanne Herskovits Castillo
- Credential
- MD PHD
- Primary taxonomy
- Geriatric Medicine (Internal Medicine) Physician 207RG0300X
- License numbers
- MD22347 ME
2006-01812 NC
Self-reported in NPPES; status is on the state search - Practice location
- 55 Fruit St, Boston, MA 02114
- Phone
- (617) 726-2000
- Enumerated
- Mar 2, 2006
- Record last updated
- Feb 9, 2026
- Medicaid ID
- 1932176443 ME
- Medicare enrollment
- Enrolled (PECOS I20041012000932); accepts Medicare assignment
- Medical or professional school
- University Of California, San Francisco School Of Medicine, 2002
- Entity
- Type 1 · individual
8 nearest geriatric medicine (internal medicine) physician records → All 225 in Massachusetts → Look up another NPI →
Also registered at 55 Fruit St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Affan Aamir, MD, PHARMD, RPHStudent in an Organized Health Care Education/Training Program1821890377
- Matthew AbadirAnesthesiology Physician1699120550
- Taimur AbbasiInternal Medicine Physician1841673522
- Megan Abbott, MDAnesthesiology Physician1730839333
- Moustafa AbdallaStudent in an Organized Health Care Education/Training Program1952046062
- Shadi Abdar Esfahani, MD, MPHDiagnostic Radiology Physician1497137590
Verify Elizabeth Joanne Herskovits Castillo in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMassachusetts Board of Registration in MedicineCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
58% fewer Medicare Part D claims than the average geriatric medicine (internal medicine) physician in 2024
1,798 Medicare Part D claims for 200 beneficiaries, against an average of 4,246 among the 3,116 providers of this specialty who prescribed in Part D. Brand-name drugs were 2% of claims.
Most prescribed
- Sertraline Hcl300 claims
- Atorvastatin Calcium260 claims
- Duloxetine Hcl259 claims
- Mirtazapine162 claims
- Gabapentin76 claims
- Trazodone Hcl67 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
The MIPS final score for 2023 (Medicare payment program): 98.1 of 100
The Merit-based Incentive Payment System score is reported for this clinician. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023; category weights for 2023 (qpp.cms.gov).
Bills Medicare through one group practice
- Massachusetts General Physicians Organization IncBoston, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Elizabeth Joanne Herskovits Castillo among 225 geriatric medicine (internal medicine) physician records in Massachusetts
Elizabeth Joanne Herskovits Castillo, MD PHD is one of 225 geriatric medicine (internal medicine) physician records with a practice address in Massachusetts. 71% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 44% newer
- In a Medicare fileYes · 71% of these records are
- In the CMS Doctors and Clinicians fileYes · 53% of these records are
- Graduated2002 · median 2000 among the 119 with a school on file
- Record last updated2026 · 63% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207RG0300X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Geriatric Medicine (Internal Medicine) Physician providers in Massachusetts
There are 225 geriatric medicine (internal medicine) physician records in Massachusetts.
All 225 in Massachusetts → Every provider in Boston → Geriatric Medicine (Internal Medicine) Physician nationwide →
The 8 geriatric medicine (internal medicine) physician records with the nearest ZIP codes
- Warren Backman, MBBSBoston, MA 021141174910574
- Sevdenur Cizginer Konuk, MD, MPHBoston, MA 021141881906725
- Kent Creamer, MDBoston, MA 021141730136508
- Ana Cecilia Cury, M.D.Boston, MA 021141437290210
- Esteban Franco Garcia, M.DBoston, MA 021141861712648
- Kathryn Hanley, M.D.Boston, MA 021141396079307
- Ardeshir Hashmi, M.D.Boston, MA 021141619143492
- Amanda Hernandez, M.D.Boston, MA 021141891062691
Common questions
What is Elizabeth Joanne Herskovits Castillo, MD PHD's NPI number?
Elizabeth Joanne Herskovits Castillo, MD PHD's National Provider Identifier (NPI) is 1932176443, issued on Mar 2, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Elizabeth Joanne Herskovits Castillo, MD PHD located?
The NPPES record lists a practice address at 55 Fruit St, Boston, MA, 02114. Phone: (617) 726-2000. Providers update this record themselves, so call before visiting.
How can I verify Elizabeth Joanne Herskovits Castillo, MD PHD's license?
Search the Massachusetts Board of Registration in Medicine at https://findmydoctor.mass.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Elizabeth Joanne Herskovits Castillo, MD PHD prescribe under Medicare Part D?
In 2024, Elizabeth Joanne Herskovits Castillo, MD PHD had 1,798 Medicare Part D claims for 200 beneficiaries; the average among geriatric medicine (internal medicine) physician prescribers was 4,246. Part D covers Medicare prescriptions only.
What is Elizabeth Joanne Herskovits Castillo, MD PHD's MIPS final score?
The 2023 MIPS final score is 98.1 of 100. The average among 454,083 clinicians with a measured score was 83.5.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.