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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 30 days.

DR. JOHN CHARLES KNOWLTON D.D.S.
NPI 1730167727
Dentist - General Practice in Lexington Park, MD

Active since January 09, 2006
22335 EXPLORATION DR, SUITE 1010, LEXINGTON PARK, MD 20653(301) 862-2118(301) 862-2351 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: July 19, 2026.

About Dr. John Charles Knowlton D.d.s. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. JOHN CHARLES KNOWLTON D.D.S. (NPI 1730167727) is an individual general practice provider in Lexington Park, Maryland, licensed in Maryland (MD5120) and active in the NPI registry since January 2006.

NPPES Registry Identity

NPI1730167727
Entity TypeIndividualMale
Primary Taxonomy1223G0001X
Provider Legal NameDR. JOHN CHARLES KNOWLTONCredential: D.D.S.
Location Address22335 EXPLORATION DR, SUITE 1010Lexington Park, MD 20653-2014
Mailing Address22335 Exploration Dr, Suite 1010Lexington Park, MD 20653-2014 · (301) 862-2118 · Fax (301) 862-2351
Phone(301) 862-2118
Fax(301) 862-2351
Sole ProprietorNo
Enumeration DateJanuary 9, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1730167727 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyDentist · General PracticeDental Providers
Taxonomy Code1223G0001X
License✔ Licensed in MD · MD5120
Definition

A general dentist is the primary dental care provider for patients of all ages. The general dentist is responsible for the diagnosis, treatment, management and overall coordination of services related to patients' oral health needs.

22335 EXPLORATION DR, Lexington Park, MD 20653
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Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

JOEL SAMUEL HERTZ D.P.M.
Podiatrist
22335 EXPLORATION DR, SUITE 1015
LEXINGTON PARK, MD 20653
St. Mary's County (301) 934-3345
SANJIV K. SAINI M.D.,LLC
Specialist
22335 EXPLORATION DR, SUITE 2005
LEXINGTON PARK, MD 20653
St. Mary's County (301) 863-7310
DR. SANJIV K SAINI MD
Specialist
22335 EXPLORATION DR, SUITE 2005
LEXINGTON PARK, MD 20653
St. Mary's County (301) 863-7310

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is John Knowlton's NPI number?

The NPI number for John Knowlton is 1730167727. It was assigned to this individual provider in the NPPES registry on January 9, 2006.

Where is John Knowlton located?

John Knowlton practices at 22335 Exploration Dr Suite 1010, Lexington Park, MD 20653. The listed phone number is (301) 862-2118.

What is John Knowlton's specialty?

The primary specialty registered for this NPI is Dentist, specializing in General Practice, with taxonomy code 1223G0001X.

When was this NPI record last updated?

The NPPES record for John Knowlton was last updated on July 13, 2026. NPI Profile syncs with the weekly NPPES data releases published by CMS.