Flood Insurance Rate Map Interagency Technology Act of 2019 or the FIRM IT Act of 2019 This bill modifies technical requirements for National Flood Insurance Program (NFIP) rate maps. Specifically, the Federal Emergency Management Agency (FEMA) must consult with the Department of Defense, the U.S. Geological Survey, and the National Oceanic and Atmospheric Administration to obtain information relevant to NFIP rate maps. FEMA may include this data, as well as specified property survey information, in NFIP rate maps. The format of NFIP rate maps must conform to specified data and protocols.