2006 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Appendicitis 540-543 > 2006 ICD-9-CM Diagnosis 541 Appendicitis unqualified View the most recent version of ICD-9-CM 541 Acute inflammation of the APPENDIX. Acute appendicitis is classified as simple, gangrenous, or perforated. 541 is a specific code that can be used to specify a diagnosis 541 contains 10 index entries  Index entries containing 541: Appendicitis 541 with perforation, peritonitis (generalized), or rupture 540.0 with peritoneal abscess 540.1 peritoneal abscess 540.1 acute (catarrhal) (fulminating) (gangrenous) (inflammatory) (obstructive) (retrocecal) (suppurative) 540.9 with perforation, peritonitis, or rupture 540.0 with peritoneal abscess 540.1 peritoneal abscess 540.1 amebic 006.8 chronic (recurrent) 542 exacerbation - see Appendicitis, acute fulminating - see Appendicitis, acute gangrenous - see Appendicitis, acute healed (obliterative) 542 interval 542 neurogenic 542 obstructive 542 pneumococcal 541 recurrent 542 relapsing 542 retrocecal 541 subacute (adhesive) 542 subsiding 542 suppurative - see Appendicitis, acute tuberculous (see also Tuberculosis) 014.8 Inflammation, inflamed, inflammatory (with exudation) appendix (see also Appendicitis) 541 cecum (see also Appendicitis) 541 retrocecal (see also Appendicitis) 541 Paratyphilitis (see also Appendicitis) 541 Periappendicitis (acute) (see also Appendicitis) 541 Perityphlitis (see also Appendicitis) 541 Typhlitis (see also Appendicitis) 541