Active NPI
Mary Elizabeth Hienaman, MD
- Obstetrics & Gynecology Physician
- Houston, TX
National Provider Identifier
1841291721
On this page
Key facts
NPPES NPI Registry- Primary specialty
- Obstetrics & Gynecology Physician
- License
- H9993
- Practice address
- 18300 Katy Fwy Ste 315
Houston, TX 77094-1386 - Phone
- (713) 365-2900
- Fax
- (832) 408-8573
- NPI assigned
- Aug 2, 2005
- Sex
- Female
- Sole proprietor
- No
NPPES NPI Registry
Registry information is reported by the provider to CMS and is not verified. About this source
Specialties & licenses 1
| Specialty (taxonomy) | Code | License | State | Primary |
|---|---|---|---|---|
| Obstetrics & Gynecology Physician | 207V00000X | H9993 | TX | Primary |
Addresses
Primary practice location
18300 Katy Fwy Ste 315
Houston, TX 77094-1386
Mailing address
18300 Katy Fwy Ste 315
Houston, TX 77094-1386
Phone (713) 365-2900
Medicare participation
Medicare enrollment files- Medicare fee-for-service enrollment
- Enrolled in TX
- Eligible to order & refer
- Part B services: Yes
- Medical equipment: Yes
- Home health: Yes
- Power mobility devices: Yes
- Hospice: Yes
Enrollment records 1
Care Compare profile
Medicare Care Compare- Specialty
- Obstetrics/Gynecology
- Education
- Texas Tech University Health Science Center School of Medicine, 1990
- Medicare assignment
- Accepts the Medicare-approved amount as payment in full
- Group practices
Practice addresses (Care Compare)
929 Gessner Rd
Suite 2225
Houston, TX 77024-2501
Phone (713) 365-2900
Hospital & facility affiliations
- Memorial Hermann Memorial City Hospital
- Houston Methodist West Hospital
- Memorial Hermann Katy Hospital
- Memorial Hermann - Texas Medical Center
Procedures performed for Medicare patients
| Procedure | Number of procedures |
|---|---|
| Removal or shaving of skin growth | 1-10 |
National Provider Directory
National Provider Directory- Medicare enrollment (NPD)
- Enrolled
- Credentials
- Doctor of Medicine
Practice roles
| Organization | Specialty | Status | New patients |
|---|---|---|---|
| Byron B. Holt, MD, PA, | Obstetrics & Gynecology | Current | Accepting new patients |
Locations
929 Gessner Rd
Ste 2225
Houston, TX 77024
Phone (713) 365-2900
18300 Katy Fwy
Ste 315
Houston, TX 77094
Phone (713) 464-2100
Interoperability endpoints
- mhienaman27086@directhoustonmethodist.org
Organizations & group practices 1
Organizations this provider is connected to: Medicare benefit reassignments (the organization bills Medicare for this provider’s services), Care Compare group memberships and National Provider Directory roles.
-
- Obstetrics & Gynecology Physician
- Houston, TX
- NPI 1730210501
Hospital & facility affiliations 12
Hospitals and other facilities this clinician is affiliated with according to Medicare Care Compare.
-
- Portable X-ray and/or Other Portable Diagnostic Imaging Supplier
- Houston, TX
- NPI 1437189115
Hospital
-
- General Acute Care Hospital
- Houston, TX
- NPI 1740233782
-
- General Acute Care Hospital
- Katy, TX
- NPI 1932152337
-
- General Acute Care Hospital
- Houston, TX
- NPI 1982666111
-
- General Acute Care Hospital
- Houston, TX
- NPI 1083937593
NPI Registry JSON
The complete NPPES record for this NPI in the NPI Registry API format.
{
"created_epoch": "1122940800000",
"enumeration_type": "NPI-1",
"last_updated_epoch": "1789084800000",
"number": "1841291721",
"addresses": [
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "MAILING",
"address_type": "DOM",
"address_1": "18300 KATY FWY STE 315",
"city": "HOUSTON",
"state": "TX",
"postal_code": "770941386",
"telephone_number": "713-365-2900",
"fax_number": "832-408-8573"
},
{
"country_code": "US",
"country_name": "United States",
"address_purpose": "LOCATION",
"address_type": "DOM",
"address_1": "18300 KATY FWY STE 315",
"city": "HOUSTON",
"state": "TX",
"postal_code": "770941386",
"telephone_number": "713-365-2900",
"fax_number": "832-408-8573"
}
],
"practiceLocations": [],
"basic": {
"last_name": "HIENAMAN",
"first_name": "MARY",
"middle_name": "ELIZABETH",
"name_prefix": "Dr.",
"credential": "MD",
"sole_proprietor": "NO",
"sex": "F",
"enumeration_date": "2005-08-02",
"last_updated": "2026-09-11",
"certification_date": "2026-09-11",
"status": "A"
},
"taxonomies": [
{
"code": "207V00000X",
"taxonomy_group": "",
"desc": "Obstetrics & Gynecology",
"state": "TX",
"license": "H9993",
"primary": true
}
],
"identifiers": [],
"endpoints": [],
"other_names": []
}Other providers in Houston, TX
Sources for this page
- NPPES NPI Registry (CMS): identity, addresses, specialties, licenses, identifiers and endpoints. Last updated by the provider on Sep 11, 2026; self-reported and not verified by CMS. Specialty names from the NUCC taxonomy.
- Medicare enrollment (CMS PECOS): enrollments, PAC IDs and benefit reassignments; Order and Referring.
- Medicare Care Compare (CMS): clinician profile, group practices, facility affiliations, MIPS scores and star ratings.
- National Provider Directory (CMS): practice roles, locations, licenses, networks and endpoints.