Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Giesela Grumbach, PHD

Clinical Social Worker in Olympia Fields, IL · enumerated 2018.

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

National Provider Identifier

1720554876

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Registry record

Entity type Individual (Type 1)

Name Giesela Grumbach

Credential PHD

Sex Female

Practice address 2601 Lincoln Hwy Ste 101, Olympia Fields, IL, 60461

Phone (773) 727-9417

Enumeration date Oct 16, 2018

Last updated in NPPES Oct 16, 2018

Taxonomy & licenses

1041C0700X Clinical Social Worker Behavioral Health & Social Service Providers · License 149007783 (IL) Primary

PHD · Doctor of Philosophy: A doctoral degree; in healthcare often held by clinical psychologists and researchers. About the PHD 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

What is the NPI number for Giesela Grumbach?

The National Provider Identifier (NPI) for Giesela Grumbach is 1720554876, a Type 1 (individual) record in the CMS NPPES registry.

Where does Giesela Grumbach practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2018-10-16.