EMS ROTARY WINGED OP FLIES IFR DIRECT TO DEST ARPT'S NDB AND IS INVOLVED IN AN UNAUTH PENETRATION OF AIRSPACE.

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IFR FLT PLAN WAS FILED BY OPS TO DEPART A HOSPITAL HELIPAD AND PROCEED IFR TO MY DEST. I CALLED XYZ FSS TO PICK UP MY IFR CLRNC. XYZ FSS RADIO REQUESTED A CLARIFICATION ON MY DEP LOCATION. I INFORMED XYZ RADIO THAT I WOULD BE DEPARTING FROM A HOSPITAL HELIPAD LOCATED IN ZZZ; AND THE GEOGRAPHICAL LOCATION WAS FILED IN THE FORM OF LATITUDE/LONGITUDE COORDINATES IN THE FLT PLAN. ALSO; I GAVE AN ESTIMATE OF DME AND DIRECTION FROM AB COUNTY ARPT; XXX; US. XYZ FSS RELAYED THE FOLLOWING SHORT RANGE CLRNC; 'ATC CLRS EMS HELI DIRECT TO XXX NDB; CLB AND MAINTAIN 4000 FT; CONTACT XXZ APCH ON 119.2; SQUAWK XXXX; CLRNC VOID IF NOT OFF BY AB40.' TIME NOW AB16. I REPEATED THE CLRNC TO XYZ RADIO. I CONTACTED XXZ APCH ON DEP AND WAS IMMEDIATELY QUERIED ON MY DEP POINT. IFR FLT WAS COMPLETED WITHOUT INCIDENT. UPON LNDG; I RECEIVED PHONE CALLS FROM XYZ RADIO AND XXZ APCH CONCERNING THE CONFUSION OVER MY DEP POINT. EVIDENTLY; THE CLRNC WAS OBTAINED AND ISSUED BASED ON AN IFR DEP FROM AB COUNTY ARPT WHICH IS CTLED BY XXZ APCH. THE ACTUAL DEP POINT WAS ZZZ; WHICH IS CTLED BY CTR. MY CLRNC NEVER MENTIONED A DEP LOCATION. I SHOULD HAVE CLARIFIED THE MISSING DEP POINT IN MY READBACK. THE ABILITY OF HELIS TO DEPART FROM LOCATIONS OTHER THAN ARPTS SEEMS TO HAVE CREATED A SOURCE OF CONFUSION AMONG VARIOUS ATC FACILITIES. WITH AN INCREASING NUMBER OF GPS APCHS BEING APPROVED INTO HOSPITAL HELIPADS AND THE ABILITY OF HELIS TO DEPART REMOTE LOCATIONS WOULD INDICATE A STRONG NEED FOR THE AVIATION COMMUNITY TO ADDRESS THIS ISSUE.