Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Duncan Reese Neilson Jr., MD

Obstetrics & Gynecology Physician in Portland, OR · enumerated 2006.

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

National Provider Identifier

1386607414

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Registry record

Entity type Individual (Type 1)

Name Duncan Reese Neilson Jr.

Credential MD

Sex Male

Practice address 300 N Graham St, Ste 100 Medical Plaza Bldg Legacy Emanuel Hospital, Portland, OR, 97227

Phone (503) 413-3622

Fax (503) 413-4238

Enumeration date Apr 10, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License MD08860 (OR) Primary

207V00000X Obstetrics & Gynecology Physician Allopathic & Osteopathic Physicians · License MD00045703 (WA) Secondary

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
136762	Medicaid	OR	-

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 Duncan Neilson?

The National Provider Identifier (NPI) for Duncan Neilson is 1386607414, a Type 1 (individual) record in the CMS NPPES registry.

Where does Duncan Neilson practice?

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

Other providers at this practice address

Browse all →

Elise Fulsang Internal Medicine Physician · Portland, OR NPI 1952305385 Neshe North Specialist · Portland, OR NPI 1649275694 Patrick Merrill Maternal & Fetal Medicine Physician · Portland, OR NPI 1972577989 Lori Farrell Internal Medicine Physician · Portland, OR NPI 1235103987 Michael Tewfik Internal Medicine Physician · Portland, OR NPI 1215903331 Matthew Riley Pediatric Gastroenterology Physician · Portland, OR NPI 1164486759 William Marshall Pediatric Gastroenterology Physician · Portland, OR NPI 1417911959 Pediatric Cardiology Center of Oregon PC Pediatric Cardiology Physician · Portland, OR NPI 1144287541

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2007-07-08.