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Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Dr. Michael Mackenzie Johnson, M.D.

Internal Medicine Physician in Sun City, AZ · enumerated 2005 · practices at Maxwell Group.

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

National Provider Identifier

1609869643

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Registry record

Entity type Individual (Type 1)
Name Dr. Michael Mackenzie Johnson
Credential M.D.
Sex Male
Practice address 14678 N Del Webb Blvd, Sun City, AZ, 85351
Phone (623) 933-8289
Fax (623) 933-2596
Enumeration date Aug 24, 2005
Last updated in NPPES Sep 9, 2016

Taxonomy & licenses

207R00000X Internal Medicine Physician Allopathic & Osteopathic Physicians · License 12960 (AZ) Primary
MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier Type State Issuer
AZ0054230 Other AZ BLUE CROSS BLUE SHIELD
110061076 Other AZ RAILROAD MEDICARE

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

Is NPI 1609869643 active?
Yes, as of the latest NPPES snapshot, NPI 1609869643 is active (record last updated 2016-09-09).
How do I verify Michael Johnson's NPI record?
Cross-check NPI 1609869643 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 2016-09-09.