Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joan M Crennan, MD

Internal Medicine Physician in Appleton, WI · enumerated 2006.

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

National Provider Identifier

1679666952

Verified

See something wrong? Report a correction

Registry record

Entity type Individual (Type 1)

Name Joan M Crennan

Credential MD

Sex Female

Practice address 1665 N Mccarthy Rd Apt 10, Appleton, WI, 54913

Phone (505) 321-4094

Enumeration date Oct 1, 2006

Last updated in NPPES Jul 8, 2007

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 39221 (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.

Read the full guide → Validate an NPI →

Frequently asked questions

How do I verify Joan Crennan's NPI record?

Cross-check NPI 1679666952 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1679666952 active?

Yes, as of the latest NPPES snapshot, NPI 1679666952 is active (record last updated 2007-07-08).

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