Leo Cass, M.D.
NPI 1033158795 · Specialist · Winchester, MA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Leo Cass, M.D. is a Specialist provider in Winchester, MA (NPI 1033158795).
Provider details
- NPI number
- 1033158795
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 33744 (MA)
Specialties & taxonomies
Other Service Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
20 yrs in NPPES registry
- Profile completeness38% of score
100% of core fields populated
- Practice footprint23% of score
2 documented practice locations
Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 33 distinct drugs on file.
| Drug | Part D claims (2024) |
|---|---|
| Sertraline Hcl | 192 |
| Metformin Hcl | 186 |
| Atorvastatin Calcium | 149 |
| Metoprolol Succinate | 148 |
| Mirtazapine | 129 |
| Lisinopril | 107 |
| Labetalol Hcl | 106 |
| Torsemide | 106 |
| Furosemide | 105 |
| Tamsulosin Hcl |
Practice location
Mailing address
Additional practice locations (1)
- 184 Swanton StWinchester, MA 01890-1921Phone: (781) 721-5025Fax: (781) 729-2297
Registry dates
- Enumerated
- 2006-06-06
- Last updated
- 2018-03-17
Frequently asked questions
- What is Leo Cass's NPI number?
- Leo Cass's National Provider Identifier (NPI) is 1033158795, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Leo Cass's specialty?
- Leo Cass is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Leo Cass located?
- Leo Cass's practice location on file with NPPES is 223 Swanton St, Winchester, MA 01890-1968.
- What is Leo Cass's phone number?
- The practice phone number listed in the NPPES registry for Leo Cass is (781) 721-5025.
- Does Leo Cass accept Medicare?
- Leo Cass is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Leo Cass's NPI active?
- Yes — Leo Cass's NPI (1033158795) is active in the NPPES registry as of the last update on 2018-03-17.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.