NPPES file of Aug 9, 2026

Ryan Michael Cassidy, M.D., PH.D.

Psychiatry Physician · Houston, TX

Ryan Michael Cassidy, M.D., PH.D. is a psychiatry physician with a practice address in Houston, Texas, and NPI 1811517618, issued on Apr 21, 2020. Check the license (Texas U9488, as entered in NPPES) on the Texas Medical Board; the Medicare figures below come from public CMS files.

Record from CMS NPPES, file of Aug 9, 2026 · Medicare files 2024 · method · Verify with CMS →

NPPES recordNPPES file of Aug 9, 2026
1811517618
Name
Ryan Michael Cassidy
Credential
M.D., PH.D.
Primary taxonomy
Psychiatry Physician 2084P0800X
License numbers
U9488 TX
64423 TN
Self-reported in NPPES; status is on the state search
Practice location
5615 H Mark Crosswell JR St, Houston, TX 77021
Phone
(713) 500-1500
Enumerated
Apr 21, 2020
Record last updated
Jun 10, 2024
Fax
(713) 500-2714
Medicare enrollment
Enrolled (PECOS I20240617000985); accepts Medicare assignment
Medical or professional school
University Of Texas Medical School At Houston, 2020
Entity
Type 1 · individual
Public record from CMS NPPES (open it on the CMS NPI Registry). Enrollment, assignment, school and telehealth: CMS Doctors and Clinicians file, Aug 2026. A record is not a license: verify it with the state board.
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Also registered at 5615 H Mark Crosswell JR St

A shared address usually means a shared clinic or building; it does not show who employs whom.

  1. Saima AkbarStudent in an Organized Health Care Education/Training Program1366270993
  2. Selina Akhter, MDPsychiatry Physician1407342785
  3. Katelynn Alcorn, MDPsychiatry Physician1124695267
  4. Bailey Brinkman, NPPsychiatric/Mental Health Nurse Practitioner1114644366
  5. Brandon Brown, MDPsychiatry Physician1396204228
  6. Ashundra Castle, MDPsychiatry Physician1467081927

Verify Ryan Michael Cassidy in five checks

  1. 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
  2. 2LicenseActive license and public ordersTexas Medical Board
    Search for license U9488    Check the board
  3. 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
  4. 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
  5. 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
Open the Texas license search

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90% fewer Medicare Part D claims than the average psychiatry physician in 2024

104 Medicare Part D claims for 22 beneficiaries, against an average of 1,000 among the 35,054 providers of this specialty who prescribed in Part D. Brand-name drugs were 0% of claims.

  1. Ryan Cassidy104
  2. Specialty average1,000

Most prescribed

  1. Buprenorphine-Naloxone16 claims
  2. Fluoxetine Hcl12 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.

Bills Medicare through one group practice

  1. UT PhysiciansHouston, TX

Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (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 →

Other psychiatry physician records in Texas

  1. Jeffrey AbassHouston, TX1851897730
  2. Arqam AbdaliHouston, TX1730615337
  3. Deana Abdel-Reheim, MDLufkin, TX1467696591
  4. Omar Abdelaziz, MDGalveston, TX1962140871
  5. Olumuyiwa Abdul, MDRichmond, TX1285898940
  6. Amina AbdullaHouston, TX1811906480
  7. Firas Abdulla, MDPlano, TX1356964621
  8. Akeel AbdullahHouston, TX1619473832
  9. Aurif Abedi, MDMcKinney, TX1922064922
  10. Nathalie Abenoza, MDDallas, TX1518543495

Common questions

What is Ryan Michael Cassidy, M.D., PH.D.'s NPI number?

Ryan Michael Cassidy, M.D., PH.D.'s National Provider Identifier (NPI) is 1811517618, issued on Apr 21, 2020. An NPI identifies a provider in billing; it is not a license.

Where is Ryan Michael Cassidy, M.D., PH.D. located?

The NPPES record lists a practice address at 5615 H Mark Crosswell JR St, Houston, TX, 77021. Phone: (713) 500-1500. Providers update this record themselves, so call before visiting.

How can I verify Ryan Michael Cassidy, M.D., PH.D.'s license?

NPPES lists Texas license number U9488, 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 Ryan Michael Cassidy, M.D., PH.D. prescribe under Medicare Part D?

In 2024, Ryan Michael Cassidy, M.D., PH.D. had 104 Medicare Part D claims for 22 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.

Written with AI tools from the named public files; every figure is computed from those files (how it is made).

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.