Skin chicken, if desired. Sprinkle chicken with 1 tablespoon curry powder and salt. Brown chicken pieces, half at a time if necessary, in 4-quart Dutch oven in hot oil over medium-high heat. Remove from pan. Add ginger, leeks, orange wedges, and remaining curry powder. Cook and stir 2 to 3 minutes or until leeks are tender.
Stir in lentils, broth, and wine. Return chicken pieces to pan. Bring to boiling; reduce heat. Cook, covered, for 55 to 60 minutes or until chicken is tender and no longer pink (170 degrees F).
Remove chicken; stir bok choy into lentil mixture. Use slotted spoon to serve. Makes 4 to 6 servings.