Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Diana Atwater, MSS, MLSP

Social Worker in Exton, PA · enumerated 2008.

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

National Provider Identifier

1659538064

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Registry record

Entity type Individual (Type 1)

Name Diana Atwater

Credential MSS, MLSP

Sex Female

Practice address 479 Thomas Jones Way, Suite 800, Exton, PA, 19341

Phone (610) 648-1130

Fax (610) 560-8219

Enumeration date May 22, 2008

Last updated in NPPES May 22, 2008

Taxonomy & licenses

104100000X Social Worker Behavioral Health & Social Service Providers Primary

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 Diana Atwater's NPI record?

Cross-check NPI 1659538064 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1659538064 active?

Yes, as of the latest NPPES snapshot, NPI 1659538064 is active (record last updated 2008-05-22).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2008-05-22.