Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. William Joseph Nienaber, MD

Cardiovascular Disease Physician in Cape Girardeau, MO · enumerated 2007.

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

National Provider Identifier

1720296940

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Registry record

Entity type Individual (Type 1)

Name Dr. William Joseph Nienaber

Credential MD

Sex Male

Practice address 211 Saint Francis Dr Ste 15, Cape Girardeau, MO, 63703

Phone (573) 331-3333

Fax (573) 331-3334

Enumeration date May 20, 2007

Last updated in NPPES Mar 1, 2021

Taxonomy & licenses

207RC0000X Cardiovascular Disease Physician Allopathic & Osteopathic Physicians · License 2007033628 (MO) 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
1720296940	Medicaid	WY	-
9019A	Other	WY	LICENSE

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

How do I verify William Nienaber's NPI record?

Cross-check NPI 1720296940 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1720296940 active?

Yes, as of the latest NPPES snapshot, NPI 1720296940 is active (record last updated 2021-03-01).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-01.