Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Charles J. Leidner, MD

Otolaryngology Physician in Salem, MA · enumerated 2006.

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

National Provider Identifier

1003889866

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Registry record

Entity type Individual (Type 1)

Name Charles J. Leidner

Credential MD

Sex Male

Practice address 55 Highland Avuene, Suite 201, Salem, MA, 01970

Phone (978) 745-6601

Fax (978) 744-4872

Enumeration date Feb 10, 2006

Last updated in NPPES Aug 1, 2008

Taxonomy & licenses

207Y00000X Otolaryngology Physician Allopathic & Osteopathic Physicians · License 41165 (MA) 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
0012295	Other	MA	NEIGHBORHOOD HEALTH
041165	Other	MA	TUFTS
D25068	Other	MA	BLUE SHIELD
19337	Other	MA	HARVARD PILGRIM
1000022	Other	MA	UNITED HEALTH CARE
2084278	Other	MA	AETNA
2054434	Medicaid	MA	-
36228	Other	MA	FALLON

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 Charles Leidner?

Charles Leidner is registered in NPPES with the primary taxonomy of Otolaryngology 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.

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-08-01.