John Charles Knowlton, D.D.S.
General Practice Dentistry · Lexington Park, MD
John Charles Knowlton, D.D.S. is a general practice dentistry with a practice address in Lexington Park, Maryland, and NPI 1730167727, issued on Jan 9, 2006. Check the license (Maryland MD5120, as entered in NPPES) with the Maryland board that licenses this profession; the federal record below is the public data PlainDoctor holds for this provider.
- Name
- John Charles Knowlton
- Credential
- D.D.S.
- Primary taxonomy
- General Practice Dentistry 1223G0001X
- License number
- MD5120 MD
Self-reported in NPPES; status is on the state search - Practice location
- 22335 Exploration Dr, Lexington Park, MD 20653
- Phone
- (301) 862-2118
- Enumerated
- Jan 9, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (301) 862-2351
- Entity
- Type 1 · individual
8 nearest general practice dentistry records → All 2,408 in Maryland → Look up another NPI →
Also registered at 22335 Exploration Dr
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Sanjiv Saini, MDSpecialist1598805293
Verify John Charles Knowlton in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Maryland board licenses this profession
Search for license MD5120Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
John Charles Knowlton among 2,408 general practice dentistry records in Maryland
John Charles Knowlton, D.D.S. is one of 2,408 general practice dentistry records with a practice address in Maryland. 62% 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 4% of them.
- NPI issued2006 · 4% of these records are older, 72% newer
- In a Medicare fileNo · 62% of these records are
- In the CMS Doctors and Clinicians fileNo · under 1% of these records are
- Record last updated2026 · 72% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 1223G0001X and a Maryland practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
6 general practice dentistry records list a practice address in Lexington Park
They are 6 of the 166 NPPES records with a practice address in Lexington Park, and 2,408 general practice dentistry records in Maryland. No Medicare prescribing, quality score, industry payment or hospital affiliation is published for this NPI.
All 2,408 in Maryland → Every provider in Lexington Park → General Practice Dentistry nationwide →
The 8 general practice dentistry records with the nearest ZIP codes
- Kathleen Buss, DDSPatuxent River, MD 206531982696845
- Bruce Finagin, DDSLexington Park, MD 206531871586800
- Jacob Kott, DDSLexington Park, MD 206531255946596
- John Seisman, DDSLexington Park, MD 206531497000459
- Mohammad Tabatabaeei-Fatemi, D.D.S.Lexington Park, MD 206531154373413
- Birukitawit Yirefu, DDSLexington Park, MD 206531144801234
- Henry Allen, DDSLeonardtown, MD 206501174786362
- Elorm AtuwoLeonardtown, MD 206501952105728
Common questions
What is John Charles Knowlton, D.D.S.'s NPI number?
John Charles Knowlton, D.D.S.'s National Provider Identifier (NPI) is 1730167727, issued on Jan 9, 2006. An NPI identifies a provider in billing; it is not a license.
Where is John Charles Knowlton, D.D.S. located?
The NPPES record lists a practice address at 22335 Exploration Dr, Lexington Park, MD, 20653. Phone: (301) 862-2118. Providers update this record themselves, so call before visiting.
How can I verify John Charles Knowlton, D.D.S.'s license?
NPPES lists Maryland license number MD5120, as entered by the provider. Search the Maryland 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.