I agree with the previous responce. Depends upon your age. However, I disagree with the notion that nothing can be done after maturity has been reached. There are medications that can mimic growth ("Discat" etc.)In addition, some surgical procedures can be performed to extend the length of your femurs and/or tib/fibs wih titanium rod/plates. I be it would cost o the order of $20000 including the postop care.
But ther are some more suddle ways to increase your height after maturity. One of the reasons for the decrease in height is the inability of certian back muscules to hold proper posture (in addition to calcification of i/v discs and weakening of vertebrae and fracturing). Therefore, some physical excersises can help you increase the strength of those muscules and in turn help you maitain the posture and look taller and feel better.
However, I would discourage any interventions unless "life and death" situation arises. Nature/G-d has given you the perfect package including your optimal size for your organs, hence any additions to original configuration may cause malfunctions in other body systems.
Be happy,
Hope it helps,
Peace.