Cassidy Grieco
Physician Assistant · Boston, MA
Cassidy Grieco is a physician assistant with a practice address in Boston, Massachusetts, and NPI 1306428941, issued on Apr 23, 2021. Check the license with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Cassidy Grieco
- Primary taxonomy
- Physician Assistant 363A00000X
- Practice location
- 133 Brookline Ave, Boston, MA 02215
- Phone
- (617) 421-1000
- Enumerated
- Apr 23, 2021
- Record last updated
- Nov 20, 2025
- Medicare enrollment
- Enrolled (PECOS I20220514000072); accepts Medicare assignment
- Medical or professional school
- Tufts University School Of Medicine, 2022
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest physician assistant records → All 4,713 in Massachusetts → Look up another NPI →
Also registered at 133 Brookline Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Cassidy Grieco in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
11% fewer Medicare Part D claims than the average physician assistant in 2024
736 Medicare Part D claims for 251 beneficiaries, against an average of 830 among the 101,058 providers of this specialty who prescribed in Part D.
Most prescribed
- Atorvastatin Calcium55 claims
- Amlodipine Besylate38 claims
- Losartan Potassium28 claims
- Metoprolol Succinate24 claims
- Fluticasone Propionate23 claims
- Omeprazole20 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.
Bills Medicare through one group practice
- Atrius Health IncDedham, MA
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Cassidy Grieco among 4,713 physician assistant records in Massachusetts
Cassidy Grieco is one of 4,713 physician assistant records with a practice address in Massachusetts. 78% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 63% of them.
- NPI issued2021 · 63% of these records are older, 32% newer
- In a Medicare fileYes · 78% of these records are
- In the CMS Doctors and Clinicians fileYes · 68% of these records are
- Graduated2022 · median 2019 among the 3,217 with a school on file
- Record last updated2025 · 38% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363A00000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
1,660 physician assistant records list a practice address in Boston
They are 1,660 of the 41,865 NPPES records with a practice address in Boston, and 4,713 physician assistant records in Massachusetts.
All 4,713 in Massachusetts → Every provider in Boston → Physician Assistant nationwide →
The 8 physician assistant records with the nearest ZIP codes
- Elizabeth Alqueza, PA-CBoston, MA 022151972584100
- Margaret Buonanno, PABoston, MA 022151851354989
- Amy Clyde, PABoston, MA 022151326001488
- Hajar Delshad, PA-CBoston, MA 022151801868914
- Nicole Dettmann, PABoston, MA 022151619931813
- Jerald Feuer, PABoston, MA 022151457332801
- Nancy Herriott, PABoston, MA 022151467418012
- Derek Hersey, PABoston, MA 022151114981289
Common questions
What is Cassidy Grieco's NPI number?
Cassidy Grieco's National Provider Identifier (NPI) is 1306428941, issued on Apr 23, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Cassidy Grieco located?
The NPPES record lists a practice address at 133 Brookline Ave, Boston, MA, 02215. Phone: (617) 421-1000. Providers update this record themselves, so call before visiting.
How can I verify Cassidy Grieco's license?
Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Cassidy Grieco prescribe under Medicare Part D?
In 2024, Cassidy Grieco had 736 Medicare Part D claims for 251 beneficiaries; the average among physician assistant prescribers was 830. Part D covers Medicare prescriptions only.
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.