Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Maria E Johnston, FNP

Family Nurse Practitioner in Tucson, AZ · enumerated 2006.

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

National Provider Identifier

1083693444

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Registry record

Entity type Individual (Type 1)

Name Maria E Johnston

Credential FNP

Sex Female

Practice address 3939 S Park Ave, #150, Tucson, AZ, 85714

Phone (520) 746-5001

Fax (520) 573-9607

Enumeration date Jan 13, 2006

Last updated in NPPES Aug 15, 2011

Taxonomy & licenses

363LF0000X Family Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN048006 (AZ) Primary

FNP · Family Nurse Practitioner: A nurse practitioner certified in family practice across the lifespan. About the FNP credential

Other identifiers

Identifier	Type	State	Issuer
364414	Medicaid	AZ	-

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

What is the NPI number for Maria Johnston?

The National Provider Identifier (NPI) for Maria Johnston is 1083693444, a Type 1 (individual) record in the CMS NPPES registry.

Where does Maria Johnston practice?

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

Other providers at this practice address

Browse all →

Rosalia Kame Family Medicine Physician · Tucson, AZ NPI 1902881766 Silvia Rouzaud Family Medicine Physician · Tucson, AZ NPI 1821077470 Diana Comaduran Family Nurse Practitioner · Tucson, AZ NPI 1528047958 Christopher Wintzer Family Medicine Physician · Tucson, AZ NPI 1104805464 Tonilyn Skater Addiction (Substance Use Disorder) Counselor · Tucson, AZ NPI 1770519308 Camelia Gembala Family Nurse Practitioner · Tucson, AZ NPI 1104004191 Kristine Moran Family Medicine Physician · Tucson, AZ NPI 1437327640 Ana Araiza Rojas Registered Dietitian · Tucson, AZ NPI 1780904805

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2011-08-15.