Quick answers
- Which hospitals does Sumiko I. Armstead work at?
- Medicare's official clinician data lists Sumiko I. Armstead at 4 hospitals: Houston Methodist Cypress Hospital, Houston Methodist West Hospital, Memorial Hermann - Texas Medical Center and Memorial Hermann Memorial City Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Sumiko I. Armstead see patients?
- Medicare's clinician data lists 3 practice locations, including Cypress, TX and Houston, TX. Call before your visit to confirm the address.
- What is Sumiko I. Armstead's specialty?
- Medicare lists Nephrology as the primary specialty, and also Hospitalist and Internal Medicine.
- Does Sumiko I. Armstead accept Medicare assignment?
- Medicare's clinician data says Sumiko I. Armstead may accept Medicare assignment (as of 2026-10-02). Ask the office whether they accept it for your visit.
- What is the phone number for Sumiko I. Armstead?
- (281) 908-8047, as listed in official Medicare / NPI Registry data.
- What is Sumiko I. Armstead's NPI number?
- 1528267812. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Sumiko I. Armstead works
Medicare's Facility Affiliation Data lists Sumiko I. Armstead at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Houston Methodist Cypress HospitalCypress, TX · Acute Care Hospital · CCN 670342
- Houston Methodist West HospitalHouston, TX · Acute Care Hospital · CCN 670077
- Memorial Hermann - Texas Medical CenterHouston, TX · Acute Care Hospital · CCN 450068
- Memorial Hermann Memorial City HospitalHouston, TX · Acute Care Hospital · CCN 450610
Practice locations
Addresses where Sumiko I. Armstead is enrolled with Medicare (CMS data updated 2026-10-02).
- 27700 Northwest Fwy, Suite 330Cypress, TX 77433 (281) 908‑8047
- 7600 Beechnut StHouston, TX 77074
- 915 Gessner Rd, Suite 100Houston, TX 77024 (713) 242‑2222
Group practices
Medicare enrollment lists Sumiko I. Armstead as a member of this group (CMS data updated 2026-10-02).
- Memorial Hermann Medical Group762 clinicians in the group
Specialties
- Nephrologyprimary
- Hospitalistalso
- Internal Medicinealso
Other nephrologists in Cypress
Clinicians with the same Medicare primary specialty in Cypress, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Baylor College Of Medicine |
| Graduation year | 2007 |
| Gender (as listed) | Female |
| Medicare assignment | May accept for some services |
| NPI (National Provider Identifier) | 1528267812 |
| 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