Robert Samuel Diaz, MD
Psychiatry Physician · Houston, TX
Robert Samuel Diaz, MD is a psychiatry physician with a practice address in Houston, Texas, and NPI 1245816727, issued on Mar 23, 2021. Check the license (Texas V7498, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert Samuel Diaz
- Credential
- MD
- Primary taxonomy
- Psychiatry Physician 2084P0800X
- License number
- V7498 TX
Self-reported in NPPES; status is on the state search - Practice location
- 2800 S Macgregor Way, Houston, TX 77021
- Phone
- (971) 322-6771
- Enumerated
- Mar 23, 2021
- Record last updated
- Mar 19, 2026
- Medicare enrollment
- Enrolled (PECOS I20250620003283); may accept Medicare assignment
- Medical or professional school
- Medical College Of Wisconsin, 2021
- Entity
- Type 1 · individual
8 nearest psychiatry physician records → All 3,318 in Texas → Look up another NPI →
Also registered at 2800 S Macgregor Way
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Zargham Abbas, MDChild & Adolescent Psychiatry Physician1689135303
- Myreb AkaninworCommunity Health/Public Health Clinical Nurse Specialist1134970387
- Wualu AltamiraStudent in an Organized Health Care Education/Training Program1902766678
- Elaheh Ashtari, PSY.DPsychologist1952773335
- Annie Benjamin, PMHNP-BCPsychiatric/Mental Health Nurse Practitioner1770829749
- Dyna Benson, APRN, PMHNPPsychiatric/Mental Health Nurse Practitioner1104536655
Verify Robert Samuel Diaz in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersTexas Medical Board
Search for license V7498Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
90% fewer Medicare Part D claims than the average psychiatry physician in 2024
96 Medicare Part D claims, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 13% of claims.
Most prescribed
- Clonazepam24 claims
- Invega Sustenna12 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.
Robert Samuel Diaz among 3,318 psychiatry physician records in Texas
Robert Samuel Diaz, MD is one of 3,318 psychiatry physician records with a practice address in Texas. 72% 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 89% of them.
- NPI issued2021 · 89% of these records are older, 8% newer
- In a Medicare fileYes · 72% of these records are
- In the CMS Doctors and Clinicians fileYes · 45% of these records are
- Graduated2021 · median 2006 among the 1,481 with a school on file
- Record last updated2026 · 49% 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 Texas practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Psychiatry Physician providers in Texas
There are 3,318 psychiatry physician records in Texas.
All 3,318 in Texas → Every provider in Houston → Psychiatry Physician nationwide →
The 8 psychiatry physician records with the nearest ZIP codes
- Katherine Cowan, M.D.Houston, TX 770211114908464
- Jose Fernandez, M.D.Houston, TX 770211437130788
- Jonathan Findley, M.D.Houston, TX 770211720213135
- Nelson Gruber, M.D.Houston, TX 770211679554158
- Pushpa Gummattira, M.D.Houston, TX 770211316928815
- Nesreen Ibrahim, MDHouston, TX 770211134384860
- Svetlana Malkina, M.D.Houston, TX 770211972585057
- Ann Saunders, M.D.Houston, TX 770211891777819
Common questions
What is Robert Samuel Diaz, MD's NPI number?
Robert Samuel Diaz, MD's National Provider Identifier (NPI) is 1245816727, issued on Mar 23, 2021. An NPI identifies a provider in billing; it is not a license.
Where is Robert Samuel Diaz, MD located?
The NPPES record lists a practice address at 2800 S Macgregor Way, Houston, TX, 77021. Phone: (971) 322-6771. Providers update this record themselves, so call before visiting.
How can I verify Robert Samuel Diaz, MD's license?
NPPES lists Texas license number V7498, as entered by the provider. Search the Texas Medical Board at https://profile.tmb.state.tx.us/Search.aspx. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert Samuel Diaz, MD prescribe under Medicare Part D?
In 2024, Robert Samuel Diaz, MD had 96 Medicare Part D claims; 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.