SAS: Unable to resolve "Invalid symbolic variable name ,." error...

First let me start by stating that I'm not a SAS programmer but was assigned to write a small program in SAS.  (The existing SAS programmer resigned.)

I'm trying to call from a DATA statement a macro that will be called recursively.  But when I run the code I receive the following message "Invalid symbolic variable name ,."  I believe this error message pertains to the macro code that I wrote.  Below is snippet of my code.  

Can someone assist me with this issue?  Thank you.

%macro ICD9Map(icd10code);
	%global cnt_ICD9, icd9_list;

	proc sql;
		select numICD9s
		into :cnt_ICD9
		from sbhs.pxlookup
		where icd10 = "&icd10code";

		%let cnt = &cnt_ICD9;

		%do i = 1 %to &cnt;
			select icd9_&i
			into :icd9_list
			separated by "~"
			from sbhs.pxlookup
			where icd10 = "&icd10code";
		%end;
	quit;

%mend ICD9Map;

data icd9Mapping;
	set sbhs.Pxreorder (obs=1);

	array Px{*} PROC1-PROC13;

	*do i = 1 to npx;
	do i = 1 to 1;
		call execute('%ICD9Map('||Px(i)||')');
	end;

	drop i;
run;

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