His records seem somewhat disjointed and from two sources. This is the best I could piece together.
Samuel Parker, Surgeon in Charge, Ward I, Macon, June 15, 1862, Assistant Surgeon, Field & Staff, 3rd Regiment Arkansas Cavalry, appointed September 4, 1862, assigned to duty with regiment, September 24, 1862, stationed at West Point, Miss. March 8, 1863, died July 14, 1863, [?]. H. Fowler filed claim for the settlement of his accounts September 16, 1864, no other records
Compiled Service Records of Confederate Soldiers Who Served in Organizations from the State of Arkansas
Compiled Service Records of Confederate General and Staff Officers, and Nonregimental Enlisted Men
Samuel Parker, Mississippi, Assistant Surgeon, Medical Department, Provisional Confederate Army
By Arthur Wyllie