New Hampshire (state wide):
Death: 10-54 (S = suicide, A = Accidental, N = Natural, D = Drowning)
Also heard as "subject threatening 10-54S"...
As described for other departments, the code for "out of service" is often used as in "We have two subjects who are 10-2", though this usage is most often heard with regards to animals ("a 10-2 deer in the road...")
Peter
K1PGV
(this whole thread points to the wisdom of using plain speech and no codes in public safety)