Public Health Ministry spokesman Wahid Majroh confirmed the toll.
No one immediately claimed the attack, but the Taliban and a militant Islamic State group affiliate regularly strike government targets in the capital and elsewhere.
The Taliban have agreed to a ceasefire coinciding with Eidul Fitr set to begin later this week. The IS affiliate is not included in the ceasefire.
Elsewhere in Afghanistan, a roadside bomb struck a microbus in eastern the eastern Ghazni province on Monday, killing six people.
Arif Noori, a spokesman for the governor of Ghazni province, said women and children were among those killed in the blast, which also wounded three people.
He said the bomb was planted by the Taliban. The insurgents mostly target security forces and government officials, but their roadside bombs often kill civilians.
Elsewhere in Ghazni, at least three local police and 10 Taliban fighters were killed in clashes, Noori said.