The objective of this study is to investigate the safety and the effect on reduction of serum phosphate of long-term administration of lanthanum carbonate (BAY77-1931) 750 to 2250 mg in patients with hyperphosphatemia who completed the 8 week double-blind treatment period of Study 14817 and are judged to be eligible for the long-term extension study.

Inclusion Criteria:

• Patients who have completed the 8-week double-blind treatment period of Study 14817 and are judged to be eligible for the long-term extension study by the investigator (including those who plan to be on dialysis during the long-term extension study).

Exclusion Criteria:

• Patients with any other conditions that the investigator defines as not appropriate to be enrolled in the study