Mr. Mark X. Williams

Mr. Mark X. Williams is a Ambulance provider (Ambulance) practicing in Memphis, TN, registered in the NPPES registry with NPI 1144455684 since 2009.

✓ Active NPI ✓ Valid NPI checksum Sole proprietor

NPI	1144455684
Entity type	Individual (Type 1)
Name	Mr. Mark X. Williams
Sex	Male
Practice address	Memphis, TN, 38141
Phone	9016198800
Fax	9017956861
Enumeration date	2009-05-28
Last updated in NPPES	2009-05-28

Street address withheld — NPPES sole-proprietor addresses can be home addresses. See our data policy.

Taxonomy & licenses

Taxonomy code	Specialty	Primary	License	State
341600000X	Ambulance	Primary	341600000X	TN

Copy-ready billing details

Provider: Mark Williams
NPI: 1144455684
Taxonomy: 341600000X (Ambulance)
Address: Memphis, TN, 38141

Verify this record

Cross-check NPI 1144455684 against the authoritative CMS record: view Mr. Mark X. Williams on the official NPPES registry .

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 or validate an NPI number.

Frequently asked questions

What is the NPI number for Mark Williams?

The National Provider Identifier (NPI) for Mark Williams is 1144455684, a Type 1 (individual) record in the CMS NPPES registry.

Where does Mark Williams practice?

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

Source: CMS NPPES (public data). Snapshot 2026-07-11. Provider record last updated 2009-05-28.