Yosef Karo, Shulchan Aruch — Orach Chaim 286
“ And if one forgot and did not pray past its entire time, it (Mussaf) does not have tashlumin (another prayer to make up for it) . And (Mussaf) has the raising of the hands (Birkat Kohanim) . RAMA: And if one prayed it before the Shacharit prayer he fulfilled his obligation. (Ohel Moed in the name of the Rashba; the R"i, perek Tefilot HaShachar) 2. Every individual is obligated to pray the mussaf prayer, regardless of whether there is a congregation in the city or not. RAMA: And afterwards, the shaliach tzibbur repeats the prayer similar to the rest of the prayers. ”
