The reading was 0.1 percentage point higher than forecast by economists polled by Poland’s PAP news agency.
In April, the prices of consumer goods and services in Poland were 12.4 percent higher than in the same month a year earlier, according to the Central Statistical Office.
In March, Poland's consumer price index stood at 11 percent, the statistics agency has said.
The Polish central bank’s Monetary Policy Council this month raised key interest rates for the eighth consecutive time in a bid to tame inflation.
The government last week unveiled details of a plan to issue new high-yield savings bonds that will be available to the public from next month in an effort to protect savers from inflation.