Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Mr. Michael Anthony Clark, R.N.

General Practice Registered Nurse in Mather, CA · enumerated 2007.

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

National Provider Identifier

1255478111

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Registry record

Entity type Individual (Type 1)

Name Mr. Michael Anthony Clark

Credential R.N.

Sex Male

Practice address 10535 Hospital Way, Mather, CA, 95655

Phone (916) 366-5410

Enumeration date Jan 31, 2007

Last updated in NPPES Jun 29, 2012

Taxonomy & licenses

163WC0400X Case Management Registered Nurse Nursing Service Providers · License RN 199634 (OH) Secondary

163WE0003X Emergency Registered Nurse Nursing Service Providers · License 741297 (CA) Secondary

163WC0200X Critical Care Medicine Registered Nurse Nursing Service Providers · License 741297 (CA) Secondary

163WG0000X General Practice Registered Nurse Nursing Service Providers · License 741297 (CA) Primary

RN · Registered Nurse: A nurse who completed an accredited nursing program and passed the NCLEX-RN licensure exam. About the RN 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

Where does Michael Clark practice?

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

What is the NPI number for Michael Clark?

The National Provider Identifier (NPI) for Michael Clark is 1255478111, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Harold Burger Infectious Disease Physician · Mather, CA NPI 1447251681 Aliya Akbar Family Medicine Physician · Mather, CA NPI 1467454934 Barbara Weiser Infectious Disease Physician · Mather, CA NPI 1164419784 Patricia Dalton Specialist · Mather, CA NPI 1003898750 Raymond Byun Infectious Disease Physician · Mather, CA NPI 1578545950 Randall Goethals Geriatric Medicine (Internal Medicine) Physician · Mather, CA NPI 1316920713 Edwin Horgan Otolaryngology Physician · Mather, CA NPI 1881677177 Martin Hoffman Physical Medicine & Rehabilitation Physician · Mather, CA NPI 1245213503

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-06-29.