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2007 ICD-9-CM Volume 1 Diagnosis Codes Home > Diseases Of The Digestive System 520-579 > Appendicitis 540-543 > ICD-9-CM Diagnosis 543 Other diseases of appendix 543 is a non-specific code that cannot be used to specify a diagnosis ICD-9-CM Diagnosis 543.0 Hyperplasia of appendix (lymphoid) 543.0 is a specific code that can be used to specify a diagnosis 543.0 contains 2 index entries ICD-9-CM Diagnosis 543.9 Other and unspecified diseases of appendix 543.9 is a specific code that can be used to specify a diagnosis 543.9 contains 25 index entries