EMS FLT DSNDS TO WRONG ALT. CTLR CORRECTS.

Narrative

I WAS AT 11000 MSL INBOUND ON THE FOSSL 2 ARR INTO PHX. THE CTLR TOLD ME TO DSND TO 9000 FT AFTER XING TONTO INTXN. DUE TO DISTRS IN THE ACFT WITH THE MEDICAL CREW; I WAS TOO BUSY TO WRITE DOWN THE 9000 ASSIGNED ALT. AFTER HEARING THE APCH CTLR ASSIGNING (10000 FT AFTER XING TONTO INTXN) TO OTHER ACFT FOLLOWING ME; I THOUGHT THAT I TOO MUST HAVE BEEN ASSIGNED 10000 FT. I DSNDED TO 10000 FT; LEVELED OFF; AND THEN WAS TOLD THAT I SHOULD HAVE DSNDED TO 9000 FT MSL. IN ORDER TO PREVENT THIS PROBLEM FROM OCCURRING IN THE FUTURE I WILL BE MORE VIGILANT ABOUT IGNORING CREW REQUESTS AND DISTRS. I NORMALLY WRITE DOWN ASSIGNED ALTS OR INSERT THE NUMBERS INTO THE ALT ALERT SYS. THIS WAS THE RARE OCCURRENCE THAT I DID NOT. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO. CALLBACK DONE FOR EMS STUDY. RPTR STATES PATIENT CONDITION IS ALWAYS A CONSIDERATION. HE WAS DISTR DUE MEDICAL PERSONNEL QUESTIONING ABOUT FLT PROGRESS. ANNOYED WITH HIMSELF THAT HE WAS NOT MORE ALERT IN USING HIS NORMAL PROCS.