MARK ALLEN WILLIAMS PMHNP-BC
NPI 1023786225
Nurse Practitioner - Psychiatric/Mental Health in Mesa, AZ

Q: What is Mark Williams's NPI number?

The NPI number for Mark Williams is 1023786225. It was assigned to this individual provider in the NPPES registry on September 1, 2021.

Q: What is Mark Williams's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Psychiatric/Mental Health, with taxonomy code 363LP0808X.

Q: When was this NPI record last updated?

The NPPES record for Mark Williams was last updated on December 12, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since September 01, 2021PECOS EnrolledAccepts Medicare Assignment

2120 W GUADALUPE RD STE 6, MESA, AZ 85202(602) 230-7373(480) 628-8577 Get Directions Write a Review

NPPES record last updated: December 12, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

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About Mark Allen Williams Pmhnp-bc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

MARK ALLEN WILLIAMS PMHNP-BC (NPI 1023786225) is an individual psychiatric/mental health provider in Mesa, Arizona, licensed in Arizona (AP-263407) and active in the NPI registry since September 2021. He is enrolled in Medicare PECOS, maintains a secondary practice location in Phoenix, and is a graduate of Other (2021).

NPPES Registry Identity

NPI1023786225

Entity TypeIndividualMale

Primary Taxonomy363LP0808X

Provider Legal NameMARK ALLEN WILLIAMSCredential: PMHNP-BC

Location Address2120 W GUADALUPE RD STE 6Mesa, AZ 85202-7366

Mailing Address3101 N Central Ave Ste 550Phoenix, AZ 85012-2635 · (602) 230-7373 · Fax (602) 682-7455

Phone(602) 230-7373

Fax(480) 628-8577

Sole ProprietorNo

Medical School CMSOtherGraduated 2021

Enumeration DateSeptember 1, 2021

Last NPPES UpdateDecember 12, 2025

NPPES CertifiedDecember 12, 2025

✔ NPI 1023786225 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · Psychiatric/Mental HealthPhysician Assistants & Advanced Practice Nursing Providers

Taxonomy Code363LP0808X

Licenses✔ Licensed in AZ · AP-263407✔ Licensed in AZ · RNP263407

2120 W GUADALUPE RD STE 6, Mesa, AZ 85202

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Secondary Practice Location 1

Location 13033 N Central Ave Ste 700Phoenix, AZ 85012-2806 · Phone (602) 230-7373 · Fax (602) 257-8029

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Arizona Complete Health, Ambetter Health, Antidote Health Plan of Arizona, Inc. and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Mark Allen Williams Pmhnp-bc is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID547658775

PECOS Enrollment IDI20211020003103

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Mark Williams reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Denova Collaborative Health, LLC

Same address

Multi-Specialty

2120 W GUADALUPE RD STE 6
Mesa, AZ 85202

Reassigned Medicare billing, Arizona enrollment
282 clinicians in this Medicare group

NPI 1124549043 (602) 230-7373

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214

This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.

81 services19 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 85202 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$85.89 typical visit price

range $55.44 – $168.60

Typical copayment $21.47 (range $13.86 – $42.15)

Most-billed visit code 99203

Established Patient

$98.00 typical visit price

range $17.72 – $137.41

Typical copayment $24.50 (range $4.43 – $34.35)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 15

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. JESUS PRADO DNP, PMHNP-BC

Nurse Practitioner (Psychiatric/Mental Health)