Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum Sole proprietor

Dr. Buffy Jean Cramer-Hammann, PSY.D.

Psychologist in Naperville, IL · enumerated 2006.

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

National Provider Identifier

1821012873

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Registry record

Entity type Individual (Type 1)

Name Dr. Buffy Jean Cramer-Hammann

Credential PSY.D.

Sex Female

Practice address Naperville, IL, 60540

Phone (630) 305-3020

Fax (630) 305-3660

Enumeration date Jul 26, 2006

Last updated in NPPES Jan 23, 2013

Street address withheld: NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 071006448 (IL) Primary

PSYD · Doctor of Psychology: A clinical doctorate in psychology focused on professional practice. About the PSYD 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

Where does Buffy Cramer-Hammann practice?

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

What is the NPI number for Buffy Cramer-Hammann?

The National Provider Identifier (NPI) for Buffy Cramer-Hammann is 1821012873, a Type 1 (individual) record in the CMS NPPES registry.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2013-01-23.