Rainier J. Diaz, M.D.
Psychiatry Physician · Tucson, AZ
Rainier J. Diaz, M.D. is a psychiatry physician with a practice address in Tucson, Arizona, and NPI 1942256482, issued on May 26, 2006. Check the license (Arizona 26841, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Rainier J. Diaz
- Credential
- M.D.
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- 26841 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 8050 E Lakeside Pkwy, Tucson, AZ 85730
- Phone
- (520) 584-5820
- Enumerated
- May 26, 2006
- Record last updated
- Jul 13, 2026
- Fax
- (520) 514-1514
- Medicaid ID
- 452045 AZ
- Medicare enrollment
- Enrolled (PECOS I20040812001075); accepts Medicare assignment
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 942 in Arizona → Look up another NPI →
Also registered at 8050 E Lakeside Pkwy
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michael Depalma, D.O.Psychiatry Physician1801193867
- Joanne Ellis, LPCMental Health Counselor1083935605
- Michelle Giblin, FNP-CFamily Nurse Practitioner1174966782
- Mikaela Haley, LPC, NCCProfessional Counselor1467177964
- Judy May Hileman, NPPsychiatric/Mental Health Nurse Practitioner1003983560
- David Jendusa, M.D.Psychiatry Physician1730257874
Verify Rainier J. Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 26841Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
2% more Medicare Part D claims than the average psychiatry physician in 2024
1,024 Medicare Part D claims for 116 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 4% of claims.
Most prescribed
- Hydroxyzine Pamoate97 claims
- Trazodone Hcl65 claims
- Haloperidol46 claims
- Duloxetine Hcl45 claims
- Benztropine Mesylate44 claims
- Venlafaxine Hcl Er42 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: $170.46
9 payments; by number, the most common kind was food and beverage; the largest payer was Otsuka America Pharmaceutical, Inc. The 13,693 providers of this specialty with any payment received $4,954.93 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
- Sonora Behavioral Health Hospital LLCTucson, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Rainier J. Diaz among 942 psychiatry physician records in Arizona
Rainier J. Diaz, M.D. is one of 942 psychiatry physician records with a practice address in Arizona. 67% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 6% of them.
- NPI issued2006 · 6% of these records are older, 61% newer
- In a Medicare fileYes · 67% of these records are
- In the CMS Doctors and Clinicians fileYes · 41% of these records are
- Graduated1989 · median 2007 among the 382 with a school on file
- Record last updated2026 · 55% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 2084P0800X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
266 psychiatry physician records list a practice address in Tucson
They are 266 of the 18,788 NPPES records with a practice address in Tucson, and 942 psychiatry physician records in Arizona.
All 942 in Arizona → Every provider in Tucson → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Michael Depalma, D.O.Tucson, AZ 857301801193867
- Thomas Emel, D.O.Tucson, AZ 857301215264924
- Francisco Garcia, M.D.Tucson, AZ 857301033239942
- David Jendusa, M.D.Tucson, AZ 857301730257874
- Lisa Thom, MDTucson, AZ 857301699903807
- Priya Asthana, D.OTucson, AZ 857241679988463
- Nikhil Borra, M.D.Tucson, AZ 857241437685963
- Matthew DinovitzTucson, AZ 857241265896005
Common questions
What is Rainier J. Diaz, M.D.'s NPI number?
Rainier J. Diaz, M.D.'s National Provider Identifier (NPI) is 1942256482, issued on May 26, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Rainier J. Diaz, M.D. located?
The NPPES record lists a practice address at 8050 E Lakeside Pkwy, Tucson, AZ, 85730. Phone: (520) 584-5820. Providers update this record themselves, so call before visiting.
How can I verify Rainier J. Diaz, M.D.'s license?
NPPES lists Arizona license number 26841, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Rainier J. Diaz, M.D. prescribe under Medicare Part D?
In 2024, Rainier J. Diaz, M.D. had 1,024 Medicare Part D claims for 116 beneficiaries; the average among psychiatry physician prescribers was 1,000. 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.