Quick answers
- Which hospitals does John M. Halphen work at?
- Medicare's official clinician data lists John M. Halphen at 2 hospitals: 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 John M. Halphen see patients?
- Medicare's clinician data lists 3 practice locations, including Houston, TX. Call before your visit to confirm the address.
- What is John M. Halphen's specialty?
- Medicare lists Geriatric Medicine as the primary specialty, and also Internal Medicine.
- Does John M. Halphen accept Medicare assignment?
- Yes. Medicare's clinician data says John M. Halphen 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 John M. Halphen?
- (713) 566-5656, as listed in official Medicare / NPI Registry data.
- What is John M. Halphen's NPI number?
- 1639289978. 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 M. Halphen works
Medicare's Facility Affiliation Data lists John M. Halphen 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 Memorial City HospitalHouston, TX · Acute Care Hospital · CCN 450610
Practice locations
Addresses where John M. Halphen is enrolled with Medicare (CMS data updated 2026-10-02).
- 5656 Kelley StHouston, TX 77026
- 5656 Kelley St, Fl 2Houston, TX 77026 (713) 566‑5656
- 6410 Fannin StHouston, TX 77030
Group practices
Medicare enrollment lists John M. Halphen as a member of this group (CMS data updated 2026-10-02).
- UT Physicians1,765 clinicians in the group
Specialties
- Geriatric Medicineprimary
- Internal Medicinealso
Other geriatricians in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | University Of Texas Medical School At San Antonio |
| Graduation year | 1995 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1639289978 |
| 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