Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joan Cassilly Petersen, LCSW

Clinical Social Worker in St Louis, MO · enumerated 2006.

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

National Provider Identifier

1003925876

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Registry record

Entity type Individual (Type 1)

Name Joan Cassilly Petersen

Credential LCSW

Sex Female

Practice address Personal Potentials, Inc., 10000 Watson Rd #2l18, St Louis, MO, 63126

Phone (314) 822-4727

Fax (314) 822-0531

Enumeration date Aug 29, 2006

Last updated in NPPES Sep 3, 2008

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 000296 (MO) Primary

LCSW · Licensed Clinical Social Worker: A social worker licensed for clinical practice including mental-health therapy. About the LCSW credential

Other identifiers

Identifier	Type	State	Issuer
005794000	Other	-	MBH NETWORK PROVIDER
064401	Other	-	V/O NETWORK PROVIDER
6122	Other	-	BCBS NETWORK PROVIDER
111252	Other	-	A/B NETWORK PROVIDER
185524	Other	-	COMPSYCH NETWORK PROVIDER
493289102	Medicaid	MO	-
6267853	Other	-	UBH NETWORK PROVIDER

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 is the NPI number for Joan Petersen?

The National Provider Identifier (NPI) for Joan Petersen is 1003925876, a Type 1 (individual) record in the CMS NPPES registry.

Where does Joan Petersen practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-09-03.