Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Ms. Annmarie Massimo, OGNP

Obstetrics & Gynecology Nurse Practitioner in Prescott, AZ · enumerated 2007.

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

National Provider Identifier

1407994809

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Registry record

Entity type Individual (Type 1)

Name Ms. Annmarie Massimo

Credential OGNP

Sex Female

Practice address 919 12th Pl, #1, Prescott, AZ, 86305

Phone (928) 778-4300

Fax (928) 771-0920

Enumeration date Feb 1, 2007

Last updated in NPPES Mar 21, 2012

Taxonomy & licenses

363LX0001X Obstetrics & Gynecology Nurse Practitioner Physician Assistants & Advanced Practice Nursing Providers · License RN034359 (AZ) Primary

Other identifiers

Identifier	Type	State	Issuer
557291	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.

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Frequently asked questions

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

What specialty is Annmarie Massimo?

Annmarie Massimo is registered in NPPES with the primary taxonomy of Obstetrics & Gynecology Nurse Practitioner. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

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Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2012-03-21.