Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Ralph Emerson Duncan III, MD

Q: What is the NPI number for Ralph Duncan?

The National Provider Identifier (NPI) for Ralph Duncan is 1851312276, a Type 1 (individual) record in the CMS NPPES registry.

Urology Physician in York, PA · enumerated 2006.

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

National Provider Identifier

1851312276

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Registry record

Entity type Individual (Type 1)

Name Dr. Ralph Emerson Duncan III

Credential MD

Sex Male

Practice address York, PA, 17403

Phone (717) 741-4785

Fax (717) 741-4696

Enumeration date Jul 21, 2006

Last updated in NPPES Oct 6, 2025

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

208800000X Urology Physician Allopathic & Osteopathic Physicians · License MD022079E (PA) 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
89372	Other	PA	THREE RIVERS
2237347	Other	PA	CIGNA
01530901	Other	PA	BLUE CROSS/KEYSTONE
496625	Other	PA	UNITED HEALTHCARE
078367	Other	PA	BLUE SHIELD
340009963	Other	PA	RAILROAD MEDICARE
26949	Other	PA	MAMSI
1012374	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 is the NPI number for Ralph Duncan?

The National Provider Identifier (NPI) for Ralph Duncan is 1851312276, a Type 1 (individual) record in the CMS NPPES registry.

Where does Ralph Duncan practice?

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

Other providers at this practice address

Browse all →

Benson Harvey Surgery Physician · York, PA NPI 1215939434 Kern Hughes Surgery Physician · York, PA NPI 1235134628 Thomas Dipasquale Orthopaedic Trauma Physician · York, PA NPI 1770588477 Edward Garber Surgery Physician · York, PA NPI 1346245958 Apple Hill Surgical Center Partners Ambulatory Surgical Clinic/Center · York, PA NPI 1801892724 Annie Kannarkatt Hematology & Oncology Physician · York, PA NPI 1750380036 Clement Ho Specialist · York, PA NPI 1871592105 Stacey Weiland Gastroenterology Physician · York, PA NPI 1649279746

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2025-10-06.