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Office
6500 W Loop South
Houston, TX 77026Phone+1 713-486-5150
Education & Training
- University of Texas Medical Branch HospitalsFellowship, Geriatric Medicine (Internal Medicine), 2006 - 2007
- Methodist Hospital (Houston) San JacintoResidency, Family Medicine, 1995 - 1998
- The University of Texas Health Science Center at San AntonioClass of 1995
Certifications & Licensure
- TX State Medical License 1997 - 2025
- American Board of Family Medicine Family Medicine
- American Board of Family Medicine Geriatric Medicine
- American Board of Family Medicine Hospice and Palliative Medicine
Publications & Presentations
PubMed
- Victimization in Unethical Unlicensed Small Residential Care Homes in the United States: The Case for Whole System Disruption.Darcy Jones Dj McMaughan, John M Halphen, Patricia Velky, Jason Burnett, Stacy A Drake
Journal of Aging & Social Policy. 2024-01-02 - Immunoassay Urine Drug Testing among Patients Receiving Opioids at a Safety-Net Palliative Medicine Clinic.John M Halphen, Joseph A Arthur, Soraira Pacheco, Linh M T Nguyen, Nikitha N Samy
Cancers. 2023-11-30 - Adherence to Opioid Patient Prescriber Agreements at a Safety Net Hospital.Soraira Pacheco, Linh M T Nguyen, John M Halphen, Nikitha N Samy, Nathaniel R Wilson
Cancers. 2023-05-27
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