A COMMERCIAL FIXED WING MLG ON ROLLOUT AFTER LNDG DURING REVERSER OP WAS GIVEN TAXI DIRECTIONS NOT CLRLY UNDERSTOOD DUE TO NOISE.

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FLT XXX (ACR XXX) WAS CLRED FOR A VISUAL APCH TO RWY 22R AT ORD. MY FO WAS FLYING WHILE I WORKED COM AS PER SOP. AFTER A NORMAL TOUCHDOWN; THE FO STILL HAD CTL OF THE ACFT INTO THE ROLLOUT. AS WE DECELERATED BELOW 80 KTS; I BEGAN PLACING MY HANDS AND FEET ON THE CTLS FOR THE XFER OF ACFT CTL. AT THIS TIME THE TWR SAID 'XXX; TURN L TXWY C; CROSS RWY 27R; THEN GND POINT 9.' WITH THE NOISE FROM THE REVERSERS AND THE XFER OF CTL TAKING PLACE; IT WAS HARD TO HEAR CLRLY AND I WAS BUSY. I QUICKLY ACKNOWLEDGED THE INSTRUCTION AND WE PROCEEDED TO THE GATE IN SHORT ORDER. AS WE APCHED THE GATE I BEGAN TO QUESTION MYSELF AS TO WHETHER I ACTUALLY HEARD THE 'CROSS RWY 27R' PART SINCE THIS IS A COMMON CLRNC FOR ORD. THERE WAS NO APPARENT CONFLICT WITH ANOTHER ACFT AND THE RWY WAS VISUALLY CHKED BEFORE XING. THE INCIDENT BOTHERED ME FOR SOME TIME FOLLOWING THE INCIDENT SINCE I TAKE PRIDE IN BEING A SAFETY CONSCIOUS PLT. I THINK I WILL QUESTION CLRNCS IN SIMILAR SITS. HAVING SAID THAT; I THINK ATC WAS A CONTRIBUTING FACTOR IN THE POTENTIAL PROB. IT IS NOT UNCOMMON FOR ATC TO ISSUE INSTRUCTIONS DURING LNDG ROLLOUT WHEN PLTS ARE VERY BUSY AND IT'S OFTEN VERY NOISY FROM REVERSING. I WOULD LIKE TO SEE A CHANGE IN ATC POLICY IN THAT ONLY MINIMUM INSTRUCTIONS BE ISSUED DURING ROLLOUT; IE; 'TURN L ON TXWY C.'