Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Leif Eric Christiansen, D.O.

Internal Medicine Physician in Reading, PA · enumerated 2005 · practices at Perkiomen Internal Medicine Assoc., P.C..

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

National Provider Identifier

1710988092

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Registry record

Entity type Individual (Type 1)

Name Dr. Leif Eric Christiansen

Credential D.O.

Sex Male

Practice address 2234 Perkiomen Ave, Reading, PA, 19606

Phone (610) 370-2511

Fax (610) 370-3266

Enumeration date Aug 9, 2005

Last updated in NPPES Feb 28, 2011

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License OS-005747-L (PA) Primary

DO · Doctor of Osteopathic Medicine: A fully licensed physician trained in osteopathic medical schools, with the same practice rights as an MD. About the DO credential

Other identifiers

Identifier	Type	State	Issuer
011169560	Medicaid	PA	-

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 specialty is Leif Christiansen?

Leif Christiansen is registered in NPPES with the primary taxonomy of Internal Medicine Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

Browse all →

Timothy Carlson Nurse Practitioner · Reading, PA NPI 1003818758 Perkiomen Internal Medicine Assoc., P.C. Internal Medicine Physician · Reading, PA NPI 1003870742 Carol Roach Family Nurse Practitioner · Reading, PA NPI 1699826032 Kersten Reider Primary Care Nurse Practitioner · Mount Penn, PA NPI 1164033916

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-02-28.