There's no "MD" mint mark on any US coin. The mint mark on a Peace dollar is near the word ONE on the back:
No mint mark = Philadelphia
D = Denver
S = San Francisco
Please see the Related Question for more.
About $27.
A 1922-D Peace Dollar in very good condition (VG8) is worth: $20; if its mint state is MS60, its value increases to: $35.00
The 1922 Peace dollar is the most common of them all in any grade. Typical Mint State coins are in the $41.00-$55.00 range.
Please check your coin again. The Carson City Mint closed in 1893.
1922 is the most common year for Peace dollars, Mint State coins in the grade range of MS-60 to MS-63 are $22.00-$33.00 retail.
1922 silver dollar with closed eagle wings
About $27.
A 1922-D Peace Dollar in very good condition (VG8) is worth: $20; if its mint state is MS60, its value increases to: $35.00
The 1922 Peace dollar is the most common of them all in any grade. Typical Mint State coins are in the $41.00-$55.00 range.
The 1922 Peace dollar is very common. Circulated examples are $30.00-$36.00. Typical Mint State coins are $38.00-$43.00
If there's no mint mark, then it was minted in Philadelphia.
Please check your coin again. The Carson City Mint closed in 1893.
Assuming the coin is circulated, the 1922-D Peace dollar is a very common coin with retail values of $16.00-$22.00 depending on the grade of the coin.
A very common coin, circulated examples are $32.00-$37.00 Typical Mint State coins are $40.00-$43.00
The mintmark is above the tail, below O of ONE
Please see the Related Question
1922 Peace dollars were minted in Philadelphia, Denver, and San Francisco.