Gregory J Diehl MD PC
NPI 1235436130 · Medical Specialty Clinic/Center · Port Jefferson Station, NY
Gregory J Diehl MD PC is a Medical Specialty Clinic/Center organization in Port Jefferson Station, NY (NPI 1235436130).
Provider details
- NPI number
- 1235436130
- Entity type
- Organization
- Primary specialty
- Medical Specialty Clinic/CenterAmbulatory Health Care Facilities
- Organization subpart
- No
- Authorized official
- Gregory Diehl, President(631) 476-7300
- License
- 1902162 (NY)
Specialties & taxonomies
Ambulatory Health Care Facilities
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure38% of score
15 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
- 2011-02-12
- Last updated
- 2011-02-12
Frequently asked questions
- What is Gregory J Diehl MD PC's NPI number?
- Gregory J Diehl MD PC's National Provider Identifier (NPI) is 1235436130, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What type of organization is Gregory J Diehl MD PC?
- Gregory J Diehl MD PC is classified in the NPPES registry as Medical Specialty Clinic/Center (Ambulatory Health Care Facilities).
- Where is Gregory J Diehl MD PC located?
- Gregory J Diehl MD PC's practice location on file with NPPES is 11 Medical Dr, Port Jefferson Station, NY 11776-1589.
- What is Gregory J Diehl MD PC's phone number?
- The practice phone number listed in the NPPES registry for Gregory J Diehl MD PC is (631) 476-7300.
- Who is the authorized official for Gregory J Diehl MD PC?
- The authorized official listed on Gregory J Diehl MD PC's NPPES record is Gregory Diehl, President. The authorized official registers and maintains the organization's NPI and is not necessarily its owner.
- Is Gregory J Diehl MD PC's NPI active?
- Yes — Gregory J Diehl MD PC's NPI (1235436130) is active in the NPPES registry as of the last update on 2011-02-12.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.