Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Margaret C Mack, RN, MSN, FNP

Family Nurse Practitioner in Carmichael, CA · enumerated 2014.

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

National Provider Identifier

1851714448

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Registry record

Entity type Individual (Type 1)

Name Margaret C Mack

Credential RN, MSN, FNP

Sex Female

Practice address 6501 Coyle Ave, Carmichael, CA, 95608

Phone (916) 864-5584

Enumeration date Feb 2, 2014

Last updated in NPPES Feb 2, 2014

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License 23158 (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

How do I verify Margaret Mack's NPI record?

Cross-check NPI 1851714448 against the official CMS registry at npiregistry.cms.hhs.gov. This page mirrors the same public NPPES data with a monthly snapshot.

Is NPI 1851714448 active?

Yes, as of the latest NPPES snapshot, NPI 1851714448 is active (record last updated 2014-02-02).

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-02.