Guillermo Diaz, NP-P
Psychiatric/Mental Health Nurse Practitioner · Hicksville, NY
Guillermo Diaz, NP-P is a psychiatric/mental health nurse practitioner with a practice address in Hicksville, New York, and NPI 1164975801, issued on Jul 29, 2016. Check the license (New York 402068, as entered in NPPES) with the New York board that licenses this profession; the Medicare figures below come from public CMS files.
- Name
- Guillermo Diaz
- Credential
- NP-P
- Primary taxonomy
- Psychiatric/Mental Health Nurse Practitioner 363LP0808X
- License number
- 402068 NY
Self-reported in NPPES; status is on the state search - Practice location
- 185 W John St # 113, Hicksville, NY 11801
- Phone
- (646) 856-9971
- Enumerated
- Jul 29, 2016
- Record last updated
- Sep 5, 2025
- Fax
- (516) 531-8539
- Medicare enrollment
- Enrolled (PECOS I20260604002306); accepts Medicare assignment
- Telehealth
- Offers telehealth (CMS)
- Entity
- Type 1 · individual
8 nearest psychiatric/mental health nurse practitioner records → All 4,129 in New York → Look up another NPI →
Also registered at 185 W John St # 113
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Norma Ramirez, NPPsychiatric/Mental Health Nurse Practitioner1366391922
Verify Guillermo Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersWhich New York board licenses this profession
Search for license 402068Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
77% fewer Medicare Part D claims than the average psychiatric/mental health nurse practitioner in 2024
210 Medicare Part D claims for 52 beneficiaries, against an average of 906 among the 30,717 providers of this specialty who prescribed in Part D.
Most prescribed
- Quetiapine Fumarate58 claims
- Alprazolam22 claims
- Sertraline Hcl22 claims
- Citalopram Hbr17 claims
- Duloxetine Hcl14 claims
- Mirtazapine14 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.
Guillermo Diaz among 4,129 psychiatric/mental health nurse practitioner records in New York
Guillermo Diaz, NP-P is one of 4,129 psychiatric/mental health nurse practitioner records with a practice address in New York. 68% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2016, is newer than 38% of them.
- NPI issued2016 · 38% of these records are older, 57% newer
- In a Medicare fileYes · 68% of these records are
- In the CMS Doctors and Clinicians fileYes · 46% of these records are
- Graduated2016 · median 2021 among the 1,914 with a school on file
- Record last updated2025 · 34% 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 New York practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
22 psychiatric/mental health nurse practitioner records list a practice address in Hicksville
They are 22 of the 1,444 NPPES records with a practice address in Hicksville, and 4,129 psychiatric/mental health nurse practitioner records in New York.
All 4,129 in New York → Every provider in Hicksville → Psychiatric/Mental Health Nurse Practitioner nationwide →
The 8 psychiatric/mental health nurse practitioner records with the nearest ZIP codes
- Sandra Agenor-Alexandre, PMHNPHicksville, NY 118011871252205
- Stacyann Cox, NURSE PRACTITIONERHicksville, NY 118011114323821
- Dijon Drummond, PMHNP-BCHicksville, NY 118011639908866
- Eileen HeiseHicksville, NY 118011538643200
- Christina Hughes, RNHicksville, NY 118011679059802
- Jean Jackson, PMHNP-BC, RNHicksville, NY 118011407530579
- Marie JeanHicksville, NY 118011679854970
- Fahimir Jean-BaptisteHicksville, NY 118011760885016
Common questions
What is Guillermo Diaz, NP-P's NPI number?
Guillermo Diaz, NP-P's National Provider Identifier (NPI) is 1164975801, issued on Jul 29, 2016. An NPI identifies a provider in billing; it is not a license.
Where is Guillermo Diaz, NP-P located?
The NPPES record lists a practice address at 185 W John St # 113, Hicksville, NY, 11801. Phone: (646) 856-9971. Providers update this record themselves, so call before visiting.
How can I verify Guillermo Diaz, NP-P's license?
NPPES lists New York license number 402068, as entered by the provider. Search the New York board that licenses this profession; the NPPES record confirms identity only.
How much does Guillermo Diaz, NP-P prescribe under Medicare Part D?
In 2024, Guillermo Diaz, NP-P had 210 Medicare Part D claims for 52 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.