Seymour Alter, M.D.
NPI 1750336251 · Specialist · Smithtown, NY
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Seymour Alter, M.D. is a Specialist provider in Smithtown, NY (NPI 1750336251).
Provider details
- NPI number
- 1750336251
- Entity type
- Individual
- Primary specialty
- SpecialistOther Service Providers
- Credential
- M.D.
- Sex
- Male
- License
- 114051 (NY)
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
1 documented practice location
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.
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-05-23
- Last updated
- 2007-07-08
Frequently asked questions
- What is Seymour Alter's NPI number?
- Seymour Alter's National Provider Identifier (NPI) is 1750336251, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Seymour Alter's specialty?
- Seymour Alter is listed in the NPPES registry with a primary specialty of Specialist (Other Service Providers).
- Where is Seymour Alter located?
- Seymour Alter's practice location on file with NPPES is 222 Middle Country Rd, Smithtown, NY 11787-2871.
- What is Seymour Alter's phone number?
- The practice phone number listed in the NPPES registry for Seymour Alter is (631) 265-7711.
- Does Seymour Alter accept Medicare?
- Seymour Alter is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Seymour Alter's NPI active?
- Yes — Seymour Alter's NPI (1750336251) is active in the NPPES registry as of the last update on 2007-07-08.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.