Gary Diederich, M.D.
NPI 1720029259 · Family Medicine Physician · Bristol, NH
Enrolled with Medicare as Practitioner - Family Practice · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Gary Diederich, M.D. is a Family Medicine Physician provider in Bristol, NH (NPI 1720029259).
Provider details
- NPI number
- 1720029259
- Entity type
- Individual
- Primary specialty
- Family Medicine PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Male
- Sole proprietor
- No
- License
- 6515 (NH)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
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
- 2006-06-08
- Last updated
- 2007-11-30
Frequently asked questions
- What is Gary Diederich's NPI number?
- Gary Diederich's National Provider Identifier (NPI) is 1720029259, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Gary Diederich's specialty?
- Gary Diederich is listed in the NPPES registry with a primary specialty of Family Medicine Physician (Allopathic & Osteopathic Physicians).
- Where is Gary Diederich located?
- Gary Diederich's practice location on file with NPPES is 859 Lake St, Bristol, NH 03222-4506.
- What is Gary Diederich's phone number?
- The practice phone number listed in the NPPES registry for Gary Diederich is (603) 744-6200.
- Does Gary Diederich accept Medicare?
- Gary Diederich is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Gary Diederich's NPI active?
- Yes — Gary Diederich's NPI (1720029259) is active in the NPPES registry as of the last update on 2007-11-30.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.