Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Douglas William Mielke, MD

Interventional Cardiology Physician in Appleton, WI · enumerated 2006.

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

National Provider Identifier

1104878149

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Registry record

Entity type Individual (Type 1)

Name Mr. Douglas William Mielke

Credential MD

Sex Male

Practice address 5045 W Grande Market Dr, Appleton, WI, 54913

Phone (920) 886-9380

Fax (920) 886-9381

Enumeration date May 17, 2006

Last updated in NPPES Mar 26, 2020

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 35277-020 (WI) Secondary

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 35277-020 (WI) Secondary

207RI0011X Interventional Cardiology Physician Allopathic & Osteopathic Physicians · License 35277-020 (WI) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

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

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.

What specialty is Douglas Mielke?

Douglas Mielke is registered in NPPES with the primary taxonomy of Interventional Cardiology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2020-03-26.