John Cassidy, M.D.
John Cassidy, M.D. is a Brain Injury Medicine (Psychiatry & Neurology) Physician in Houston, TX, registered under NPI 1114097748. This provider registers 5 separate taxonomy codes, which usually means they practise across more than one recognised specialty.
Getting there
The practice address on file is 1 RIVERWAY SUITE 600, Houston, TX 77056. We have not yet mapped what surrounds this office — parking, transit, and nearby pharmacies are added as our data collection reaches each location.
Credentials and Medicare
| Licence | State | Specialty |
|---|---|---|
| H3450 | TX | Brain Injury Medicine (Psychiatry &… primary |
| H3450 | TX | Behavioral Neurology & Neuropsychiatry… |
| H3450 | TX | Neurology Physician |
| H3450 | TX | Neurodevelopmental Disabilities Physician |
| H3450 | TX | Psychiatry Physician |
This provider holds licence H3450 issued in TX. A licence number in NPPES reflects what was filed at registration — it does not confirm the licence is still active today.
- Status
- Approved
- Provider type
- Practitioner - Psychiatry
- PAC ID
- 9931017019
Medicare enrolment is recorded as approved under the provider type Practitioner - Psychiatry. This means the provider is enrolled to bill Medicare, though it does not tell you whether they are currently accepting new Medicare patients. Call the office to confirm.
What Brain Injury Medicine covers
A Brain Injury Medicine physician specializes in disorders of brain function due to injury and disease. These disorders encompass a range of medical, physical, neurologic, cognitive, sensory, and behavioral disorders that result in psychosocial, educational, and vocational consequences. NUCC Health Care Provider Taxonomy, code 2084P0301X
All registered taxonomy codes
This provider registers 5 taxonomy codes. The primary code is what appears on most claims; the others record additional recognised specialties.
| Code | Specialty | Licence | State | |
|---|---|---|---|---|
| 2084P0301X | Brain Injury Medicine (Psychiatry & Neurology) Physician Brain Injury Medicine | H3450 | TX | primary |
| 2084B0040X | Behavioral Neurology & Neuropsychiatry Physician Behavioral Neurology & Neuropsychiatry | H3450 | TX | |
| 2084N0400X | Neurology Physician Neurology | H3450 | TX | |
| 2084P0005X | Neurodevelopmental Disabilities Physician Neurodevelopmental Disabilities | H3450 | TX | |
| 2084P0800X | Psychiatry Physician Psychiatry | H3450 | TX |
The taxonomy records how the provider classifies their own practice. It does not confirm which conditions they currently treat, whether they are accepting new patients, or which insurance they take — call the office for that.
Full NPPES record
An NPI-1 identifies a single person. It stays with the clinician for life, even if they move practice or change state, which is why the address on file can lag behind where they actually work today.
| NPI | 1114097748 valid check digit |
|---|---|
| Entity type | Individual (NPI-1) |
| Enumeration date | Nov 9, 2006 |
| Last updated | Sep 19, 2022 |
| Status | Active |
| Sole proprietor | No |
| Credential | M.D. |
| Practice address |
1 RIVERWAY SUITE 600 Houston, TX 77056 (713) 355-6111 Fax (713) 355-6822 |
| Mailing address |
1 RIVERWAY STE 700 Houston, TX 77056 |
Number check
How the check works, step by step
Every NPI carries a Luhn check digit — the same scheme used on credit cards. CMS prefixes the number with 80840 before computing it, which marks it as a US health identifier.
| Digit | 8 | 0 | 8 | 4 | 0 | 1 | 1 | 1 | 4 | 0 | 9 | 7 | 7 | 4 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubled? | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 | — | ×2 |
| Value | 8 | 0 | 8 | 8 | 0 | 2 | 1 | 2 | 4 | 0 | 9 | 5 | 7 | 8 |
Sum = 62 · next multiple of 10 = 70 · check digit = 8 · actual last digit = 8
A valid check digit only means the number is well-formed. It does not mean the provider is licensed, active, or in good standing — those are separate questions answered by the sections above.