Like many of the Ramesside tombs, that of Rameses IX Neferkare Setepenre has been open since antiquity, attested by the Greek and Roman graffiti on its walls. It is situated opposite the tomb of Rameses II (KV7) near the entrance to the main part of the Valley.

Architecturally the tomb continues the Ramesside style although some of the decoration is not completely traditional. Even though the king reigned for 18 years only the first corridor was completely decorated by the time of the pharaoh's death and the corridor beyond the pillared hall was hastily enlarged to house the king's sarcophagus.

A staircase ramp descends to the entrance of the tomb and the first corridor. On the outer lintel is a depiction of a sundisc with scarab, adored by the king with Isis and Nephthys. The north wall of the first corridor shows the king offering before Re-Horakhty and Osiris, scenes from the 'Book of the Dead' and an Iun-Mutef priest before Osiris. The south wall shows the king in a kiosk, in an unconventional scene offering to a form of Amun-Re-Horakhty with four rams heads and to Meretseger, the goddess of the Western Mountain. The first division of the 'Book of Caverns' is illustrated on this wall. There are four niches off the first corridor which show the king's names on the jambs and the first one of these on the right may have been cut short because it ran into KV55 next to it. The ceiling is decorated with vultures and the king's names.

The second corridor depicts scenes from the 'Litanies of Re', (depicting the sun in its 75 forms throughout its nightly journey), the 'Book of the Dead' and the 'Book of Caverns'. An astronomical ceiling shows constellations and decans lists.

The outer lintel to the third corridor shows a sundisc containing a ram-headed god and a baboon with the king adoring and followed by 5 goddesses on either side. The south wall has scenes from the 'Amduat' with representations of Underworld deities and some hieratic graffiti. On the opposite wall are scenes of the king offering to Ma'at, Ptah and the king as Osiris, with more hieratic graffiti. The astronomical ceiling shows pictures of divine barques and processions of gods in yellow on a dark blue background.

The vestibule or well-room illustrates Iun-Mutef priests officiating in the ritual of the 'Opening of the Mouth' with a ram-standard on the left of the doorway and an ibis-standard in the right.

There is a winged disc and the king's names on the outer lintel of the four-pillared hall, but it was otherwise left undecorated.

The tomb extends beyond the pillared hall with a corridor which was turned into the burial chamber at the king's death. In the entrance to the burial chamber, on the soffit, a disc depicts a ram-headed god adored by four baboons. On the inside of the doorway is a goddess with standards on the right and a mummiform Geb on the left. The south and north walls depict scenes from the 'Book of Caverns', 'Book of the Earth' and the 'Amduat'. The ceiling is similar to that in the burial chamber of Rameses VI, showing Nut swallowing the sun in a double scene of the 'Book of the Night'. The divine barque is pulled by jackals.

The floor of the burial chamber was cut to contain the king's coffin though no traces of a lid has been found. The mummy of Rameses IX was found in the Deir el-Bahri cache (DB320) in 1881, still with its floral garlands, in a coffin originally belonging to Lady Neskhons the wife of Pinudjem II, after its reburial in year 7 of Siamun.