Preferred Provider Organization. A health care organization composed of physicians, hospitals, or other providers which provides health care services at a reduced fee. A PPO is similar to an HMO, but care is paid for as it is received instead of in advance in the form of a scheduled fee.
MARK L BING, MD â NPI #1386642882. Internal Medicine. A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly.
Hours of Operation. 1  Dr. Leo Jeng has been identified as specializing in endocrinology and has been in practice for more than 11 years. 2  Taxonomy: 207RE0101X. 3  Speciality: Endocrinology, Diabetes & Metabolism. 4  Type: Internal Medicine. 5  Licence Number: N8797 (Texas)