Mark Allen Williams, PMHNP-BC
Psychiatric/Mental Health Nurse Practitioner · Mesa, AZ
Mark Allen Williams, PMHNP-BC is a psychiatric/mental health nurse practitioner with a practice address in Mesa, Arizona, and NPI 1023786225, issued on Sep 1, 2021. Check the license (Arizona AP-263407, as entered in NPPES) with the Arizona board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Mark Allen Williams
- Credential
- PMHNP-BC
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License numbers
- AP-263407 AZ
RNP263407 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 2120 W Guadalupe RD Ste 6, Mesa, AZ 85202
- Phone
- (602) 230-7373
- Enumerated
- Sep 1, 2021
- Record last updated
- Dec 12, 2025
- Fax
- (480) 628-8577
- Medicare enrollment
- Enrolled (PECOS I20211020003103); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 1,887 in Arizona → Look up another NPI →
Also registered at 2120 W Guadalupe RD Ste 6
A shared address usually means a shared clinic or building; it does not show who employs whom.
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- Jessica Capps, DNPPsychiatric/Mental Health Nurse Practitioner1508529421
- Marcus Fossmeyer, DNP, PMHNPPsychiatric/Mental Health Nurse Practitioner1447773478
- Mollie Glovinsky, DNP, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1902527336
- Branden Haws, LPCProfessional Counselor1730944463
Verify Mark Allen Williams in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich Arizona board licenses this profession
Search for license AP-263407Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
49% more Medicare Part D claims than the average psychiatric/mental health nurse practitioner in 2024
1,346 Medicare Part D claims for 80 beneficiaries, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Clonazepam121 claims
- Quetiapine Fumarate92 claims
- Trazodone Hcl84 claims
- Alprazolam82 claims
- Lamotrigine82 claims
- Aripiprazole64 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $573.60
24 payments; by number, the most common kind was food and beverage; the largest payer was Iti, Inc. (d/b/a Intra-Cellular Therapies, Inc.). The 23,362 providers of this specialty with any payment received $1,027.77 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Denova Collaborative Health, LLCPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Mark Allen Williams among 1,887 psychiatric/mental health nurse practitioner records in Arizona
Mark Allen Williams, PMHNP-BC is one of 1,887 psychiatric/mental health nurse practitioner records with a practice address in Arizona. 73% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2021, is newer than 53% of them.
- NPI issued2021 · 53% of these records are older, 38% newer
- In a Medicare fileYes · 73% of these records are
- In the CMS Doctors and Clinicians fileYes · 57% of these records are
- Graduated2021 · median 2020 among the 1,079 with a school on file
- Record last updated2025 · 23% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 363LP0808X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
154 psychiatric/mental health nurse practitioner records list a practice address in Mesa
They are 154 of the 9,151 NPPES records with a practice address in Mesa, and 1,887 psychiatric/mental health nurse practitioner records in Arizona.
All 1,887 in Arizona → Every provider in Mesa → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Marianne Barker, ARNPMesa, AZ 852021710930987
- Catherine Bradway, MSN, APRN, BCMesa, AZ 852021831128016
- Princess Darko-Amoako, PMHNPMesa, AZ 852021043775547
- Marcus Fossmeyer, DNP, PMHNPMesa, AZ 852021447773478
- Michelle Gilreath, PMHNP-BCMesa, AZ 852021679025944
- Rebecca Green, N.P.Mesa, AZ 852021982714416
- Francis KahigaMesa, AZ 852021477185759
- Amanda Keenhold, DNP, PMHNPMesa, AZ 852021013248699
Common questions
What is Mark Allen Williams, PMHNP-BC's NPI number?
Mark Allen Williams, PMHNP-BC's National Provider Identifier (NPI) is 1023786225, issued on Sep 1, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Mark Allen Williams, PMHNP-BC located?
The NPPES record lists a practice address at 2120 W Guadalupe RD Ste 6, Mesa, AZ, 85202. Phone: (602) 230-7373. Providers update this record themselves, so call before visiting.
How can I verify Mark Allen Williams, PMHNP-BC's license?
NPPES lists Arizona license number AP-263407, as entered by the provider. Search the Arizona board that licenses this profession; the NPPES record confirms identity only.
How much does Mark Allen Williams, PMHNP-BC prescribe under Medicare Part D?
In 2024, Mark Allen Williams, PMHNP-BC had 1,346 Medicare Part D claims for 80 beneficiaries; the average among psychiatric/mental health nurse practitioner prescribers was 906. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.