Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Calvert Internal Medicine Group PA

Internal Medicine Physician in Prince Frederick, MD · enumerated 2006 · authorized official Jonathan Lowenthal, President.

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

National Provider Identifier

1174682298

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Registry record

Entity type Organization (Type 2)

Legal business name Calvert Internal Medicine Group PA

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

Phone (410) 535-2005

Fax (410) 535-4761

Enumeration date Dec 6, 2006

Last updated in NPPES Jul 21, 2022

Taxonomy & classification

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Primary

Authorized official

Name Jonathan Lowenthal

Title President

Phone (410) 535-2005

Other identifiers

Identifier	Type	State	Issuer
C041	Other	DC	CAREFIRST OF DC
KB03	Other	MD	CAREFIRST OF MD
256411400	Medicaid	MD	-

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.

Read the full guide → Validate an NPI →

Frequently asked questions

What is a Type 2 NPI?

A Type 2 NPI identifies an organization (group practice, hospital, pharmacy, lab), while Type 1 NPIs identify individual providers. Organizations bill under their Type 2 NPI.

What type of organization is Calvert Internal Medicine Group PA?

Calvert Internal Medicine Group PA is registered in NPPES as a Internal Medicine Physician (its primary provider taxonomy).

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