Leo Maxwell Cass, M.D.
Specialist · Winchester, MA
Leo Maxwell Cass, M.D. is a specialist with a practice address in Winchester, Massachusetts, and NPI 1033158795, issued on Jun 6, 2006. Check the license (Massachusetts 33744, as entered in NPPES) with the Massachusetts board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Leo Maxwell Cass
- Credential
- M.D.
- Primary taxonomy
- Specialist 174400000X
- License number
- 33744 MA
Self-reported in NPPES; status is on the state search - Practice location
- 223 Swanton St, Winchester, MA 01890
- Phone
- (781) 721-5025
- Enumerated
- Jun 6, 2006
- Record last updated
- Mar 17, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (781) 729-2297
- Entity
- Type 1 · individual
8 nearest specialist records → All 1,096 in Massachusetts → Look up another NPI →
Also registered at 223 Swanton St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eileen Bradley, LICSWClinical Social Worker1295294817
Verify Leo Maxwell Cass in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Massachusetts board licenses this profession
Search for license 33744Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
74% more Medicare Part D claims than the average specialist in 2024
2,401 Medicare Part D claims for 17 beneficiaries, against an average of 1,380 among the 8,233 providers of this specialty who prescribed in Part D. 21 claims were for opioids.
Most prescribed
- Sertraline Hcl192 claims
- Metformin Hcl186 claims
- Atorvastatin Calcium149 claims
- Metoprolol Succinate148 claims
- Mirtazapine129 claims
- Lisinopril107 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.
Leo Maxwell Cass among 1,096 specialist records in Massachusetts
Leo Maxwell Cass, M.D. is one of 1,096 specialist records with a practice address in Massachusetts. 15% 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 10% of them.
- NPI issued2006 · 10% of these records are older, 69% newer
- In a Medicare fileYes · 15% of these records are
- In the CMS Doctors and Clinicians fileNo · 12% of these records are
- Record last updated2018 · 82% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 174400000X and a Massachusetts practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Specialist providers in Massachusetts
There are 1,096 specialist records in Massachusetts.
All 1,096 in Massachusetts → Every provider in Winchester → Specialist nationwide →
The 8 specialist records with the nearest ZIP codes
- Linda DefruscioWinchester, MA 018901457040099
- Barbara Messineo, M.D.Winchester, MA 018901346213287
- Maher Tadros, M.D.Winchester, MA 018901447421706
- Linda Thebeau, LCMTWinchester, MA 018901790742716
- Dwayne Baharozian, M.D.Westford, MA 018861669477477
- Christine UvelloWestford, MA 018861407046352
- Evangeline BrownWakefield, MA 018801760763262
- Audrey GoforthWakefield, MA 018801598970576
Common questions
What is Leo Maxwell Cass, M.D.'s NPI number?
Leo Maxwell Cass, M.D.'s National Provider Identifier (NPI) is 1033158795, issued on Jun 6, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Leo Maxwell Cass, M.D. located?
The NPPES record lists a practice address at 223 Swanton St, Winchester, MA, 01890. Phone: (781) 721-5025. Providers update this record themselves, so call before visiting.
How can I verify Leo Maxwell Cass, M.D.'s license?
NPPES lists Massachusetts license number 33744, as entered by the provider. Search the Massachusetts board that licenses this profession; the NPPES record confirms identity only.
How much does Leo Maxwell Cass, M.D. prescribe under Medicare Part D?
In 2024, Leo Maxwell Cass, M.D. had 2,401 Medicare Part D claims for 17 beneficiaries; the average among specialist prescribers was 1,380. 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.