Type 2 · Organization ✓ Active NPI ✓ Valid NPI checksum

Karen Nielsen, D.O.

Q: What type of organization is Karen Nielsen, D.O.?

Karen Nielsen, D.O. is registered in NPPES as a Clinic/Center (its primary provider taxonomy).

Clinic/Center in Narberth, PA · enumerated 2008 · authorized official Karen Nielsen, Physician.

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

National Provider Identifier

1194993808

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Registry record

Entity type Organization (Type 2)

Legal business name Karen Nielsen, D.O.

Practice address 822 Montgomery Ave, Suite 315, Narberth, PA, 19072

Phone (610) 667-4601

Fax (610) 667-6416

Enumeration date Feb 15, 2008

Last updated in NPPES Sep 25, 2008

Taxonomy & classification

261Q00000X Clinic/Center Ambulatory Health Care Facilities · License OS014231 (PA) Primary

Authorized official

Name Karen Nielsen

Title Physician

Phone (215) 253-7263

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 Karen Nielsen, D.O.?

Karen Nielsen, D.O. is registered in NPPES as a Clinic/Center (its primary provider taxonomy).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-25.