Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mary Elizabeth Holbrook

Peer Specialist in Detroit, MI · enumerated 2022.

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

National Provider Identifier

1831850841

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Registry record

Entity type Individual (Type 1)

Name Mary Elizabeth Holbrook

Sex Female

Practice address 6821 Medbury St, Detroit, MI, 48211

Phone (313) 922-2222

Enumeration date Jan 3, 2022

Last updated in NPPES Jan 3, 2022

Taxonomy & licenses

175T00000X Peer Specialist Other 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.

Read the full guide → Validate an NPI →

Frequently asked questions

Is NPI 1831850841 active?

Yes, as of the latest NPPES snapshot, NPI 1831850841 is active (record last updated 2022-01-03).

How do I verify Mary Holbrook's NPI record?

Cross-check NPI 1831850841 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 2022-01-03.