Gary D. Diederich, M.D.
Family Medicine Physician · Bristol, NH
Gary D. Diederich, M.D. is a family medicine physician with a practice address in Bristol, New Hampshire, and NPI 1720029259, issued on Jun 8, 2006. Check the license (New Hampshire 6515, as entered in NPPES) on the New Hampshire Board of Medicine; the Medicare figures below come from public CMS files.
- Name
- Gary D. Diederich
- Credential
- M.D.
- Primary taxonomy
- Family Medicine Physician 207Q00000X
- License number
- 6515 NH
Self-reported in NPPES; status is on the state search - Practice location
- 859 Lake St, Bristol, NH 03222
- Phone
- (603) 744-6200
- Enumerated
- Jun 8, 2006
- Record last updated
- Nov 30, 2007 (not updated in 19 years: call before relying on the address or phone)
- Fax
- (603) 744-9024
- Medicaid ID
- 80000321 NH
- Entity
- Type 1 · individual
8 nearest family medicine physician records → All 816 in New Hampshire → Look up another NPI →
Verify Gary D. Diederich in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersNew Hampshire Board of Medicine
Search for license 6515Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
99% fewer Medicare Part D claims than the average family medicine physician in 2024
43 Medicare Part D claims, against an average of 3,544 among the 117,163 providers of this specialty who prescribed in Part D.
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Gary D. Diederich among 816 family medicine physician records in New Hampshire
Gary D. Diederich, M.D. is one of 816 family medicine physician records with a practice address in New Hampshire. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 13% of them.
- NPI issued2006 · 13% of these records are older, 43% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileNo · 61% of these records are
- Record last updated2007 · 62% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207Q00000X and a New Hampshire practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
2 family medicine physician records list a practice address in Bristol
They are 2 of the 43 NPPES records with a practice address in Bristol, and 816 family medicine physician records in New Hampshire.
All 816 in New Hampshire → Every provider in Bristol → Family Medicine Physician nationwide →
The 8 family medicine physician records with the nearest ZIP codes
- Peter Doane, MDBristol, NH 032221184694804
- Christopher Almeida, DOBelmont, NH 032201467422600
- Richard Obrien, MDBelmont, NH 032201518930551
- Jason Pannozzo, MDBelmont, NH 032201790411346
- Benjamin Colby, MDHopkinton, NH 032291649683194
- Michelle Currier, D.O.Hopkinton, NH 032291518129022
- Lynn Durand, MDHopkinton, NH 032291235177833
- John Malcolm, MDHopkinton, NH 032291124432216
Common questions
What is Gary D. Diederich, M.D.'s NPI number?
Gary D. Diederich, M.D.'s National Provider Identifier (NPI) is 1720029259, issued on Jun 8, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gary D. Diederich, M.D. located?
The NPPES record lists a practice address at 859 Lake St, Bristol, NH, 03222. Phone: (603) 744-6200. Providers update this record themselves, so call before visiting.
How can I verify Gary D. Diederich, M.D.'s license?
NPPES lists New Hampshire license number 6515, as entered by the provider. Search the New Hampshire Board of Medicine at https://www.oplc.nh.gov/board-medicine. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Gary D. Diederich, M.D. prescribe under Medicare Part D?
In 2024, Gary D. Diederich, M.D. had 43 Medicare Part D claims; the average among family medicine physician prescribers was 3,544. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.