Specific code 2010 ICD-9-CM Diagnosis Code 542
Other appendicitis
  • ICD-9-CM 542 is a billable medical code that can be used to indicate a diagnosis on a reimbursement claim, however, 542 should only be used for claims with a date of service on or before September 30, 2015. For claims with a date of service on or after October 1, 2015, use an equivalent ICD-10-CM code (or codes).
  • You are viewing the 2010 version of ICD-9-CM 542.
  • More recent version(s) of ICD-9-CM 542: 2011 2012 2013 2014 2015.
Convert to ICD-10-CM: 542 converts directly to:
  • 2015/16 ICD-10-CM K36 Other appendicitis
Approximate Synonyms
  • Appendicitis of a pelvic appendix
  • Appendicitis, chronic
  • Atypical appendicitis
  • Catarrhal appendicitis
  • Chronic appendicitis
  • Healed appendicitis
  • Recurrent appendicitis
  • Relapsing appendicitis
  • Retrocecal appendicitis
  • Retroileal appendicitis
  • Subacute appendicitis
542 Excludes
  • hyperplasia (lymphoid) of appendix (543.0)
Applies To
  • Appendicitis:
    • chronic
    • recurrent
    • relapsing
    • subacute
ICD-9-CM Volume 2 Index entries containing back-references to 542:
  • Appendicitis 541
    • chronic (recurrent) 542
    • healed (obliterative) 542
    • interval 542
    • neurogenic 542
    • obstructive 542
    • recurrent 542
    • relapsing 542
    • subacute (adhesive) 542
    • subsiding 542
  • Subsiding appendicitis 542
ICD-9-CM codes are used in medical billing and coding to describe diseases, injuries, symptoms and conditions. ICD-9-CM 542 is one of thousands of ICD-9-CM codes used in healthcare. Although ICD-9-CM and CPT codes are largely numeric, they differ in that CPT codes describe medical procedures and services. Can't find a code? Start at the root of ICD-9-CM, check the 2010 ICD-9-CM Index or use the search engine at the top of this page to lookup any code.