Gregory Leonard Koontz, DMD
Periodontics · Oceanside, CA
Gregory Leonard Koontz, DMD is a periodontics with a practice address in Oceanside, California, and NPI 1417064437, issued on Aug 24, 2006. Check the license with the California board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- Gregory Leonard Koontz
- Credential
- DMD
- Primary taxonomy
- Periodontics 1223P0300X
- License numbers
- 0401411550 VA
28850 TX
Self-reported in NPPES; status is on the state search - Practice location
- 200 Mercy Circle, Oceanside, CA 92055
- Phone
- (757) 300-6695
- Enumerated
- Aug 24, 2006
- Record last updated
- Jul 12, 2024
- Entity
- Type 1 · individual
8 nearest periodontics records → All 929 in California → Look up another NPI →
Also registered at 200 Mercy Circle
A shared address usually means a shared clinic or building; it does not show who employs whom.
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Verify Gregory Leonard Koontz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich California board licenses this professionCheck the board
- 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Gregory Leonard Koontz among 929 periodontics records in California
Gregory Leonard Koontz, DMD is one of 929 periodontics records with a practice address in California. 69% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does not. Its NPI, issued in 2006, is newer than 3% of them.
- NPI issued2006 · 3% of these records are older, 71% newer
- In a Medicare fileNo · 69% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2024 · 78% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223P0300X and a California practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Periodontics providers in California
There are 929 periodontics records in California. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 929 in California → Every provider in Oceanside → Periodontics nationwide →
The 8 periodontics records with the nearest ZIP codes
- Alex Long, DDSCamp Pendleton, CA 920551376064386
- Bradley McKeever, DDSCamp Pendleton, CA 920551861485997
- Anna Hsu, DDS MSOceanside, CA 920561841330198
- Mark Krupp, D.D.S., M.S.Oceanside, CA 920541033229968
- Bruce Johnson, D.M.D.Poway, CA 920641497773485
- Alireza Khansari, DDS, MSDPoway, CA 920641821183864
- Roya Mirkhan, DMD., MSD.Poway, CA 920641891816658
- Nader Nagavi, DDS, MDSPoway, CA 920641730149840
Common questions
What is Gregory Leonard Koontz, DMD's NPI number?
Gregory Leonard Koontz, DMD's National Provider Identifier (NPI) is 1417064437, issued on Aug 24, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Gregory Leonard Koontz, DMD located?
The NPPES record lists a practice address at 200 Mercy Circle, Oceanside, CA, 92055. Phone: (757) 300-6695. Providers update this record themselves, so call before visiting.
How can I verify Gregory Leonard Koontz, DMD's license?
Search the California board that licenses this profession; the NPPES record confirms identity 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. 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.