Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Marissa Williams, PA-C

Physician Assistant in Zephyrhills, FL · enumerated 2011 · practices at Zephyrhills Family Practice and Geriatric Care, LLC.

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

National Provider Identifier

1851688873

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Registry record

Entity type Individual (Type 1)

Name Marissa Williams

Credential PA-C

Sex Female

Practice address 7213 Green Slope Dr, Zephyrhills, FL, 33541

Phone (813) 355-4914

Fax (855) 547-5415

Enumeration date Jun 29, 2011

Last updated in NPPES Jun 16, 2026

Taxonomy & licenses

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers Secondary

363A00000X Physician Assistant Physician Assistants & Advanced Practice Nursing Providers · License PA9106109 (FL) Primary

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 Marissa Williams practice?

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

What is the NPI number for Marissa Williams?

The National Provider Identifier (NPI) for Marissa Williams is 1851688873, a Type 1 (individual) record in the CMS NPPES registry.

Other providers at this practice address

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Harry Blackstone Family Medicine Physician · Zephyrhills, FL NPI 1720016496 Joseph Nystrom Family Medicine Physician · Zephyrhills, FL NPI 1629006127 Roland Mckendree Family Nurse Practitioner · Zephyrhills, FL NPI 1841639945 Zephyrhills Family Practice and Geriatric Care, LLC Family Medicine Physician · Zephyrhills, FL NPI 1154825677 Calvin Zhang Physician Assistant · Zephyrhills, FL NPI 1013744051

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2026-06-16.