Kelsey-Seybold Clinic is Houston's premier multispecialty group practice, founded in 1949 by Dr. Mavis Kelsey in Houston's renowned Texas Medical Center. More than 1,000 physicians and allied health professionals practice at 45 locations in the Greater Houston area. Kelsey-Seybold offers quality medical care in 65+ medical specialties. The organization operates the largest freestanding Ambulatory Surgery Center in the state of Texas and offers state-of-the-art Varian TrueBeam and Varian Edge radiation therapy technology at a nationally accredited Cancer Center. An accredited Sleep Center, comprehensive laboratory services, advanced imaging and diagnostics, 24 onsite Kelsey pharmacies and one specialty pharmacy, and MyKelseyOnline, a secure web portal, are part of its comprehensive offerings. Kelsey-Seybold partners with major insurers to offer value-based commercial health plans. KelseyCare Advantage, a Medicare Advantage plan offered to Houston-area beneficiaries and affiliated with Kelsey-Seybold Clinic, has achieved the coveted 5-out-of-5-star rating from the Centers for Medicare and Medicaid for eight consecutive years.

Kelsey-Seybold has been recognized by the National Committee for Quality Assurance (NCQA) as the nation’s first accredited Accountable Care Organization and is home to a nationally accredited Breast Diagnostic Center and Endoscopy Center.

Kelsey-Seybold Clinic achieved a Net Promoter Score (NPS) of 91. NPS is the global standard for measuring customer loyalty and satisfaction. An NPS score of 70 or higher is considered by industry experts to be "world class" and an indicator of overwhelming customer loyalty.