Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Jonathan David Lowenthal, MD

Internal Medicine Physician in Prince Frederick, MD · enumerated 2006 · practices at Calvert Internal Medicine Group PA.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1861553711

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Registry record

Entity type Individual (Type 1)

Name Dr. Jonathan David Lowenthal

Credential MD

Sex Male

Practice address 985 Prince Frederick Blvd Ste 201, Prince Frederick, MD, 20678

Phone (410) 535-2005

Fax (410) 535-4850

Enumeration date Dec 13, 2006

Last updated in NPPES Jul 21, 2022

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License D33123 (MD) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
C0410005	Other	DC	CAREFIRST OF DC
4461101	Other	MD	AETNA NON-HMO
394841200	Medicaid	MD	-
2148224	Other	MD	AETNA PCP HMO
41717901	Other	MD	CAREFIRST OF MD
836798	Other	MD	OPTIMUM CH-MDIPA
110032509	Other	MD	RAILROAD MC

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

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Frequently asked questions

Where does Jonathan Lowenthal practice?

The practice location on file with NPPES is in Prince Frederick, MD. Providers can have multiple locations; NPPES lists the primary practice address.

What is the NPI number for Jonathan Lowenthal?

The National Provider Identifier (NPI) for Jonathan Lowenthal is 1861553711, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-07-21.