Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.

Gregory J Diehl MD PC

Organization Medical Specialty Clinic/Center · NPI 1235436130

Gregory J Diehl MD PC is a Medical Specialty Clinic/Center in Port Jefferson Station, New York. Licensed in New York. Registered with an NPI since 2011.

Licensed in
NY
In the registry since
2011
What do these letters mean?
PC — Professional corporation
A form of business registration, not a clinical qualification.

See every abbreviation used in this directory →

Practice location Address checks out

11 Medical Dr Ste B
Port Jefferson Station, NY 11776-1589
Phone: (631) 476-7300
Fax: (631) 476-7304
Show map & directions

Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Medical Specialty Clinic/Center (primary) Taxonomy 261QM2500X · Licence 1902162 (NY)

Record details

NPI number1235436130
Entity typeOrganization (Type 2)
Organization subpartNo
Authorized official Gregory Diehl — President · (631) 476-7300
NPI enumeratedFebruary 12, 2011
Last updated in NPPESFebruary 12, 2011
Mailing address11 Medical Dr, Suite B, Port Jefferson Station, NY 11776-1589

Other providers in Port Jefferson Station