Quick answers
- Which hospitals does Ryan N. Armstrong work at?
- Medicare's official clinician data lists Ryan N. Armstrong at 1 hospital: HCA Houston Healthcare Clear Lake. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Ryan N. Armstrong see patients?
- Medicare's clinician data lists 2 practice locations, including Friendswood, TX and Shenandoah, TX. Call before your visit to confirm the address.
- What is Ryan N. Armstrong's specialty?
- Medicare lists Interventional Radiology as the primary specialty, and also Diagnostic Radiology.
- Does Ryan N. Armstrong accept Medicare assignment?
- Yes. Medicare's clinician data says Ryan N. Armstrong 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.
- What is the phone number for Ryan N. Armstrong?
- (281) 778-1802, as listed in official Medicare / NPI Registry data.
- What is Ryan N. Armstrong's NPI number?
- 1154453355. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Ryan N. Armstrong works
Medicare's Facility Affiliation Data lists Ryan N. Armstrong at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- HCA Houston Healthcare Clear LakeWebster, TX · Acute Care Hospital · CCN 450617
Practice locations
Addresses where Ryan N. Armstrong is enrolled with Medicare (CMS data updated 2026-10-02).
- 8780 Hwy 6 B, Mh Conv Care Sienna PlantationFriendswood, TX 77549 (281) 778‑1802
- 8850 Six Pines Dr, Suite 280Shenandoah, TX 77380 (713) 575‑3986
Group practices
Medicare enrollment lists Ryan N. Armstrong as a member of these groups (CMS data updated 2026-10-02).
- Singleton Associates PA838 clinicians in the group
- Texas Endovascular Associates PLLC12 clinicians in the group
Specialties
- Interventional Radiologyprimary
- Diagnostic Radiologyalso
Other interventional radiologists in Texas
Clinicians with the same Medicare primary specialty in Texas — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 2003 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1154453355 |
| 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