Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Kristi Lynn Hainstock, PHD

Psychologist in Bay City, MI · enumerated 2012.

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

National Provider Identifier

1639444391

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Registry record

Entity type Individual (Type 1)

Name Dr. Kristi Lynn Hainstock

Credential PHD

Sex Female

Practice address 2919 Wilder Rd, Suite 2, Bay City, MI, 48706

Phone (989) 671-5757

Enumeration date Mar 14, 2012

Last updated in NPPES Mar 26, 2021

Taxonomy & licenses

103T00000X Psychologist Behavioral Health & Social Service Providers · License 6301015359 (MI) 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

Is NPI 1639444391 active?

Yes, as of the latest NPPES snapshot, NPI 1639444391 is active (record last updated 2021-03-26).

How do I verify Kristi Hainstock's NPI record?

Cross-check NPI 1639444391 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2021-03-26.