Records show he died at the General Hospital No 5, Louisville, Ky, died Nov. 23, 1862 of Dysentery. Hospital Admittance not shown.

His Compiled Service Record file could possibly provide the information you seek. These are located at the U. S. National Archives in Washington, D. C. and may also be procured by a service provided by these message boards, contact the Webmaster:
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U.S., Registers of Deaths of Volunteers, 1861-1865

Name: C W Doremuss
Death Date: 23 Nov 1862
Death Place: G H No 5 Louisville, Kentucky
Enlistment State: Indiana
Rank: Private
Company: B
Regiment: 87 Ind V
Box Number: 11

Ancestry.com. U.S., Registers of Deaths of Volunteers, 1861-1865 [database on-line]. Provo, UT, USA: Ancestry.com Operations, Inc., 2012.