Tomball Location

Houston Location



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Family Diagnostic Clinic

Dr. Muhammad Irfan MD

We Are Your Comprehensive Medical Care Of Choice.

Dr. Imran Nathani

Dr. Imran Nathani is a graduate of Dow Medical College in Pakistan and completed his residency in Chicago at the Illinois Masonic Medical Center, affiliated with Rush Presbyterian Hospital.

Board-certified in internal medicine, Dr. Nathani has practiced in Houston since 1997. He treats patients 16 years and older. His clinical interests include chronic medical conditions, diabetes, hypertension, high cholesterol, dementia, assisting patients in identifying their needs, and decisions regarding end-of-life care. He has served as chief of staff at Kindred Hospital for four years and Chief of Medicine at Tomball Hospital for several years, currently serving at Tomball as Chief of Staff elect.

Dr. Nathani’s practice philosophy is to help his patients any way he can, treating them as family. Friendship, he feels, is an important aspect of the doctor-patient relationship.

A resident of Spring, Dr. Nathani is married and the father of three children. Outside of his practice, he enjoys volunteering in a community free clinic, organizing community education programs, traveling with family and sports.

Dr. Muhammad Irfan

Dr. Muhammad Irfan is a graduate of Dow Medical College in Pakistan and completed his residency at the Baylor College of Medicine in Houston. He began practicing in South Texas in 1996 and has practiced in Houston since 2001.

Board-certified in internal medicine and palliative medicine, Dr. Irfan’s clinical interests include diabetes, high blood pressure, and patients with complex, multiple medical problems. He treats patients 16 years old and up and speaks Urdu.

Dr. Irfan enjoys working with his patients, seeing himself as a friend who helps them with their medical problems and coordinates care with other physicians when referral to specialists is appropriate. Patients appreciate his honesty, trustworthiness, ready availability, and the fact that he sees patients in the hospital.

A resident of Spring, Dr. Irfan is married and the father of two. He enjoys running and spending time with his family, including playing with his two daughters.


Passion Bryant

Passion Bryant is board certified Adult-Gerontology Primary Care Nurse practitioner and has been practicing at Family Diagnostic Clinic since 2018. She received her Bachelor of Science in Health Education and Promotion from the University of Florida in Gainesville, Florida and later received her Bachelor of Science in Nursing from Jacksonville University. She was employed in Jacksonville, Fl as a Registered Nurse (RN)with licensure since 2011. She has worked as a RN in Medical-Surgical, Orthopedics, and Recovery care units before later pursuing her Master of Science in Nursing from the University of South Alabama. She has a strong and diverse clinical background in health education and promotion, chronic disease and acute care management. Her focus is on patient-centered care driven, from a comprehensive approach with a focus in health education, disease prevention, and management.

In her spare she enjoys spending time with her husband of 9 years and 3-year old daughter while taking trips to Disney World.

Verna Casey

Verna Casey is a board-certified family nurse practitioner practicing at the Family Diagnostic Clinic since 2021. Before her nurse practitioner career, she served in the United States Navy and retired after 20 years of service in 2022. While in the service, she pursued her nursing career. She received her Bachelor of Science in Nursing from the University of Texas Medical Branch in Galveston in 2014 and worked in the Emergency Department and Interventional Radiology. She later pursued her Master of Science in Nursing from Chamberlain University in 2019.

Casey understands that caring for patients goes beyond providing physical care. She believes in respecting every patient and encouraging their involvement in their care. She focuses on patient-centered care, emphasizing health education, prevention, and management.

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