Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Joseph S. B. Buck, M.D.

Adult Reconstructive Orthopaedic Surgery Physician in Walnut Creek, CA · enumerated 2015.

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

National Provider Identifier

1366837304

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Registry record

Entity type Individual (Type 1)

Name Joseph S. B. Buck

Credential M.D.

Sex Male

Practice address 1425 S Main St, Walnut Creek, CA, 94596

Phone (925) 295-4130

Enumeration date Apr 6, 2015

Last updated in NPPES Dec 7, 2022

Taxonomy & licenses

207X00000X Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 210028 (NC) Secondary

207XS0114X Adult Reconstructive Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License 12247277-1205 (UT) Secondary

207XS0114X Adult Reconstructive Orthopaedic Surgery Physician Allopathic & Osteopathic Physicians · License A177636 (CA) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD 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.

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Frequently asked questions

How do I verify Joseph Buck's NPI record?

Cross-check NPI 1366837304 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1366837304 active?

Yes, as of the latest NPPES snapshot, NPI 1366837304 is active (record last updated 2022-12-07).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2022-12-07.