Seymour Alter MD
About this NPIWhat this record shows.
NPI 1871671909 is registered to Seymour Alter MD, a healthcare organisation classified as "Internal Medicine" and located at 222 E Main St, Suite 109 in Smithtown, New York. The organisation's authorised official is Seymour Alter. The organisation has been enumerated in the NPI registry since 2006.
Your brand here.
Insurance & acceptsHow to confirm coverage.
The National Plan and Provider Enumeration System (NPPES) registry does not include commercial insurance network data, so we cannot show which plans Seymour Alter MD accepts. To confirm in-network status with your specific health plan, contact Seymour Alter MD directly at (631) 265-1177.
Frequently asked
Yes. NPI 1871671909 is registered as Active in the CMS NPPES public registry and passes the Luhn check-digit validation that all 10-digit NPIs use.
Internal Medicine physicians (internists) specialise in the prevention, diagnosis, and treatment of diseases in adults, often coordinating care across multiple subspecialties.
The CMS NPPES Public Registry at npiregistry.cms.hhs.gov is the authoritative source. FindMyNPI mirrors this dataset and refreshes monthly. For real-time verification, you can also call the provider's office at (631) 265-1177.
An individual healthcare provider has a single Type-1 NPI for life. Organisations can hold separate Type-2 NPIs per location, specialty, or sub-entity. Seymour Alter MD is a Type-2 organisational NPI.