Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Douglas P Calvin, M.D.

Radiation Oncology Physician in Appleton, WI · enumerated 2005.

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

National Provider Identifier

1780677906

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Registry record

Entity type Individual (Type 1)

Name Dr. Douglas P Calvin

Credential M.D.

Sex Male

Practice address 3925 N Gateway Dr, Appleton, WI, 54913

Phone (920) 749-1171

Fax (920) 749-1172

Enumeration date Aug 23, 2005

Last updated in NPPES Feb 16, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 13714 (MS) Secondary

2085R0001X Radiation Oncology Physician Allopathic & Osteopathic Physicians · License 13714 (MS) 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
005570200	Medicaid	FL	—

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.

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Frequently asked questions

What is the NPI number for Douglas Calvin?

The National Provider Identifier (NPI) for Douglas Calvin is 1780677906, a Type 1 (individual) record in the CMS NPPES registry.

Where does Douglas Calvin practice?

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

Other providers at this practice address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2016-02-16.