Quick answers
- Which hospitals does Mary E. Hienaman work at?
- Medicare's official clinician data lists Mary E. Hienaman at 4 hospitals: Houston Methodist West Hospital, Memorial Hermann - Texas Medical Center, Memorial Hermann Katy Hospital and Memorial Hermann Memorial City Hospital. This is where the clinician works or has privileges; call the hospital to confirm.
- Where does Mary E. Hienaman see patients?
- Medicare's clinician data lists 2 practice locations, including Houston, TX. Call before your visit to confirm the address.
- What is Mary E. Hienaman's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Mary E. Hienaman accept Medicare assignment?
- Yes. Medicare's clinician data says Mary E. Hienaman 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 Mary E. Hienaman?
- (713) 365-2900, as listed in official Medicare / NPI Registry data.
- What is Mary E. Hienaman's NPI number?
- 1841291721. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Hospitals where Mary E. Hienaman works
Medicare's Facility Affiliation Data lists Mary E. Hienaman at these hospitals (updated 2026-10-02). Each hospital page shows its address, phone, emergency services, Medicare rating and all its clinicians.
- Houston Methodist West HospitalHouston, TX · Acute Care Hospital · CCN 670077
- 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
Practice locations
Addresses where Mary E. Hienaman is enrolled with Medicare (CMS data updated 2026-10-02).
- 18300 Katy Fwy, Suite 315Houston, TX 77094 (713) 365‑2900
- 929 Gessner Rd, Suite 2225Houston, TX 77024 (713) 365‑2900
Group practices
Medicare enrollment lists Mary E. Hienaman as a member of this group (CMS data updated 2026-10-02).
- Byron B Holt MD PA3 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in Houston
Clinicians with the same Medicare primary specialty in Houston, TX — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Texas Tech University Health Science Center School Of Medicine |
| Graduation year | 1990 |
| Gender (as listed) | Female |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1841291721 |
| 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