Any reason why the MIC920 op amp should not be used in SINGLE SUPPLY mode?
Look at the Maximum Output Voltage Swing.
With \$\pm\$5V supply voltage, the output range is \$\pm\$3V. So your output will not got to ground in a single supply, but will be stuck at a minimum voltage of at least 2V.
With \$\pm\$9V the datasheet is even more conservative and specifies a headroom of -2.8V.
These values are given for a load resisitance of 2k\$\Omega\$, so if your load will be high impedance, then the minimum output voltage will probably be a bit higher.
But the OpAmp is clearly not designed as a single supply device, as the output is not nearly R2R.

Figure 2-12 shows you the negative output voltage for \$\pm\$9V supply rails vs. output current - and even at 0mA the output will not go below -8V. So even with a really high impedance load your output would not be able to go lower than 1V above ground.