Quick answers
- Which hospitals does John R. Williams work at?
- Medicare's official clinician data lists John R. Williams at 4 hospitals: Memorial Hermann - Texas Medical Center, Memorial Hermann Katy Hospital, Memorial Hermann Memorial City Hospital and Memorial Hermann Sugar Land Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does John R. Williams see patients?
- Medicare's clinician data lists 1 practice location in Houston, TX. Call before your visit to confirm the address.
- What is John R. Williams's specialty?
- Medicare lists Neurosurgery as the primary specialty.
- Does John R. Williams accept Medicare assignment?
- Yes. Medicare's clinician data says John R. Williams accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- Does John R. Williams offer telehealth?
- Medicare's clinician data says John R. Williams offers telehealth services. Ask the office which visits can be done by video or phone.
- What is the phone number for John R. Williams?
- (713) 486-8100, as listed in official Medicare / NPI Registry data.
- What is John R. Williams's NPI number?
- 1336536200. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where John R. Williams works
Medicare's Facility Affiliation Data lists John R. Williams at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Memorial Hermann - Texas Medical CenterHouston, TX · Acute Care Hospital · CCN 450068
- Memorial Hermann Katy HospitalKaty, TX · Acute Care Hospital · CCN 450847
- Memorial Hermann Memorial City HospitalHouston, TX · Acute Care Hospital · CCN 450610
- Memorial Hermann Sugar Land HospitalSugar Land, TX · Acute Care Hospital · CCN 450848
Practice locations
Addresses where John R. Williams is enrolled with Medicare (CMS data updated 2026-10-02).
- 6400 Fannin St, Suite 2150Houston, TX 77030 (713) 486‑8100
Group practices
Medicare enrollment lists John R. Williams as a member of this group (CMS data updated 2026-10-02).
- UT Physicians213 clinicians in the group
Specialties
- Neurosurgeryprimary
Other neurosurgeons in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Graduation year | 2015 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| Telehealth | Offers telehealth services |
| NPI (National Provider Identifier) | 1336536200 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- Facility Affiliation Data — Centers for Medicare & Medicaid Services (CMS), data updated 2026-10-02, retrieved 2026-10-29
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians