Caitlin H. Trethewey, PHARMD
Pharmacist · Shrewsbury, MA
Caitlin H. Trethewey, PHARMD is a pharmacist with a practice address in Shrewsbury, Massachusetts, and NPI 1275181539, issued on Aug 29, 2019. Check the license (Massachusetts PH239075, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Caitlin H. Trethewey
- Credential
- PHARMD
- Primary taxonomy
- Pharmacist 183500000X
- License number
- PH239075 MA
Self-reported in NPPES; status is on the state search - Practice location
- 557 Main St, Shrewsbury, MA 01545
- Phone
- (508) 842-8400
- Enumerated
- Aug 29, 2019
- Record last updated
- Aug 29, 2019 (not updated in 7 years: call before relying on the address or phone)
- Fax
- (508) 842-2539
- Entity
- Type 1 · individual
8 nearest pharmacist records → All 5,932 in Massachusetts → Look up another NPI →
Also registered at 557 Main St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Hilary Kusz, PHARM.D.Pharmacist1326424862
- Robert Macrae, PHARMD, RPHPharmacist1972042406
- Neil Shailer, RPH, CDMPharmacist1104959212
Verify Caitlin H. Trethewey in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license PH239075Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Most of these Medicare Part D claims are vaccines, 100% of the cost of the top drugs
21 Medicare Part D claims for 19 beneficiaries, against an average of 119 among the 28,524 providers of this specialty who prescribed in Part D. Brand-name drugs were 100% of claims.
Most prescribed
Pharmacies often give vaccines under a standing order that names one clinician, and CMS counts every such claim under that clinician's NPI. These claims are therefore not a measure of this clinician's own prescribing.
- Arexvy11 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.
Caitlin H. Trethewey among 5,932 pharmacist records in Massachusetts
Caitlin H. Trethewey, PHARMD is one of 5,932 pharmacist records with a practice address in Massachusetts. 4% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2019, is newer than 43% of them.
- NPI issued2019 · 43% of these records are older, 55% newer
- In a Medicare fileYes · 4% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2019 · 70% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 183500000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
67 pharmacist records list a practice address in Shrewsbury
They are 67 of the 550 NPPES records with a practice address in Shrewsbury, and 5,932 pharmacist records in Massachusetts.
All 5,932 in Massachusetts → Every provider in Shrewsbury → Pharmacist nationwide →
The 8 pharmacist records with the nearest ZIP codes
- Anna Bonfiglio, PHARM.D.Shrewsbury, MA 015451619377116
- Amy FoltaShrewsbury, MA 015451639454507
- Neha KashalikarShrewsbury, MA 015451730501305
- Rimma KaufmanShrewsbury, MA 015451821032160
- Payal Kotadiya, PHARM.D.Shrewsbury, MA 015451215269204
- Bradley Lamberton, R.PH.Shrewsbury, MA 015451235329186
- Pavel Lavitas, PHARM.D.Shrewsbury, MA 015451164844775
- Karen Lee, PHARM.D.Shrewsbury, MA 015451134111016
Common questions
What is Caitlin H. Trethewey, PHARMD's NPI number?
Caitlin H. Trethewey, PHARMD's National Provider Identifier (NPI) is 1275181539, issued on Aug 29, 2019. An NPI identifies a provider in billing; it is not a license.
Where is Caitlin H. Trethewey, PHARMD located?
The NPPES record lists a practice address at 557 Main St, Shrewsbury, MA, 01545. Phone: (508) 842-8400. Providers update this record themselves, so call before visiting.
How can I verify Caitlin H. Trethewey, PHARMD's license?
NPPES lists Massachusetts license number PH239075, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Caitlin H. Trethewey, PHARMD prescribe under Medicare Part D?
In 2024, Caitlin H. Trethewey, PHARMD had 21 Medicare Part D claims for 19 beneficiaries; the average among pharmacist prescribers was 119. 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.