RFC 1700 contains the possible values for each ICMP type and code; 

Type 	Name 				Code(s)
0 	Echo reply 			0 - none
1 	Unassigned 	 
2 	Unassigned 	 
3 	Destination unreachable 	
					0 - Net unreachable
  	  				1 - Host unreachable
  	  				2 - Protocol unreachable
  	  				3 - Port unreachable
  	  				4 - Fragmentation needed and DF bit set
  	  				5 - Source route failed
  	  				6 - Destination network unknown
  	  				7 - Destination host unknown
  	  				8 - Source host isolated
  	  				9 - Communication with destination network is administratively prohibited
  	  				10 - Communication with destination host is administratively prohibited
  	  				11 - Destination network unreachable for TOS
  	  				12 - Destination host unreachable for TOS
4 	Source quench 			
					0 - none
5 	Redirect 	
					0 - Redirect datagram for the network
  	  				1 - Redirect datagram for the host
  	  				2 - Redirect datagram for the TOS and network
  	  				3 - Redirect datagram for the TOS and host
6 	Alternate host address 	
					0 - Alternate address for host
7 	Unassigned 	 
8 	Echo 				0 - None
9 	Router advertisement 		0 - None
10 	Router selection 		0 - None
11 	Time Exceeded 			
					0 - Time to live exceeded in transit
  	  				1 - Fragment reassembly time exceeded
12 	Parameter problem 		
					0 - Pointer indicates the error
  	  				1 - Missing a required option
  	  				2 - Bad length
13 	Timestamp 			0 - None
14 	Timestamp reply 		0 - None
15 	Information request 		0 - None
16 	Information reply 		0 - None
17 	Address mask request 		0 - None
18 	Address mask reply 		0 - None
19 	Reserved (for security) 	 
20-29 	Reserved (for robustness experiment) 	 
30 	Traceroute 	 
31 	Datagram conversion error 	 
32 	Mobile host redirect 	 
33 	IPv6 where-are-you 	 
34 	IPv6 I-am-here 	 
35 	Mobile registration request 	 
36 	Mobile registration reply 	 
37-255 	Reserved