A quick look provides the following information:

BOOTH, RECORDS OF CONFEDERATE SOLDIERS (1920) VOL III, P. 1185
Young, Warren, Pvt. Co. D, 9th La. Inf. En. March 1, 1862, Bossier Par., La. Roll May and June, 1862, Present or absent not stated. Rolls June 30, 1862. to Dec., 1862, Absent on wounded furlough. Roll Jan. and Feb., 1863, Present. Roll March and April, 1863, Absent, sick. Roll May and June, 1863, Present or absent not stated. Rolls July, 1863, to Oct., 1863, Absent, sick, in Hospl. at Lynchburg, Va. Roll Nov. and Dec., 1863, Absent, sick, in La. Roll Jan. and Feb., 1864, Absent without leave since Jan. 20, 1864. Roll of Prisoners of War of furloughed and detailed men, C. S. A., Paroled Shreveport, La., June 13, 1865. Res. Bossier Par., La. Record copied from Memorial Hall, New Orleans, La., by the War Dept., Washington, D. C., June, 1903, born Alabama, occupation farmer, Res. Rocky Mt., age when enlisted 19, single. Remarks: Deserted to La.

NPS-CWSS - (HTTP://WWW.ITD.NPS.GOV/CWSS/)
Warren Young, Co. D, 9th LA Infantry (Film M378, Roll 31)

NARA-CSR M320 - 9TH LA INFANTRY
Young PW (1 page) and Young, P Warren (21 pages) – Co. D, 9th LA Infantry
Roll dated April 25, 1862 - Mustered in March 1, 1862, Gordonsville, VA, Enrolled in Bellevue, Bossier Parish, LA by RT Cranford for the war.
Roll May-June, 1862 – Not Stated
Roll June 31 to Oct 31, 1862 – Absent wounded
Register CSA Genl Hosp, Charlottesville, VA – furloughed Oct 12, 1862
Roll Nov & Dec, 1862 – Absent on furlough, wounded
Roll Jan-Feb, 1863 – Present
Roll March-April, 1863 – Absent sick
Register Louisiana Hospital, Richmond, VA, Mar-Apr, 1863 - Present
Register Wayside Hospital, Richmond, VA, Transferred to LA Hospital Apr 26, 1863
Roll May-June, 1863 – Not Stated
Roll July-Aug, 1863 – Absent, sick in Lynchburg, VA
Roll Sept-Oct, 1863 – Absent sick at Lynchburg Hospital
Roll Nov-Dec – Absent, sick in Louisiana
Roll Jan-Feb, 1864 – Absent without leave since Jan 20, 1864
Roll not dated – Deserted to LA
2nd Manassas – Severely wounded Aug 28, 1862
Roll of POW – Paroled at Shreveport, LA on June 13, 1865

1860 US CENSUS, BOSSIER PARISH, LA (NARA M653, P. 47)
19 year old “hand on farm” of William Young (58 yo Planter, assets of $9,500)

Hope this is helpful.

Don Parker