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One Medical Group, Inc.

Family Medicine Physician in Brookfield, WI · enumerated 2022 · authorized official Andrew Diamond, Chief Medical Officer.

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

National Provider Identifier

1801505813

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Registry record

Entity type Organization (Type 2)
Legal business name One Medical Group, Inc.
Practice address 95 N Moorland Rd Ste E9, Brookfield, WI, 53005
Phone (888) 663-6331
Enumeration date Nov 17, 2022
Last updated in NPPES Nov 17, 2022

Taxonomy & classification

207Q00000X Family Medicine Physician Allopathic & Osteopathic Physicians Primary
207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians Secondary
208000000X Pediatrics Physician Allopathic & Osteopathic Physicians Secondary

Authorized official

Name Andrew Diamond
Title Chief Medical Officer
Phone (415) 593-1455

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

Who is the authorized official for One Medical Group, Inc.?
NPPES lists Andrew Diamond (Chief Medical Officer) as the authorized official for this organization.
What is the NPI number for One Medical Group, Inc.?
The NPI for One Medical Group, Inc. is 1801505813, a Type 2 (organization) record in the CMS NPPES registry.

Providers at this address

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-11-17.