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

Dr. Diego John Muilenburg, M.D.

Surgery Physician in Springfield, OR · enumerated 2005.

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

National Provider Identifier

1295716926

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Registry record

Entity type Individual (Type 1)

Name Dr. Diego John Muilenburg

Credential M.D.

Sex Male

Practice address Springfield, OR, 97477

Phone (541) 222-8333

Fax (541) 222-8320

Enumeration date Nov 9, 2005

Last updated in NPPES Feb 28, 2024

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

Taxonomy & licenses

2086X0206X Surgical Oncology Physician Allopathic & Osteopathic Physicians · License 53543 (AZ) Secondary

2086X0206X Surgical Oncology Physician Allopathic & Osteopathic Physicians · License MD166758 (OR) Secondary

208600000X Surgery Physician Allopathic & Osteopathic Physicians · License MD166758 (OR) 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
500675780	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 specialty is Diego Muilenburg?

Diego Muilenburg is registered in NPPES with the primary taxonomy of Surgery 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

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David Dehaas Surgery Physician · Springfield, OR NPI 1417986761 Kevin Modeste Surgery Physician · Springfield, OR NPI 1942447032

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2024-02-28.