Appendicitis (540-543) ICD-9-CM
The 540-543 section covered appendicitis with 7 legacy diagnosis codes across 4 code blocks. The info icons preview the first codes of each block, and every code page carries its ICD-10-CM crosswalk.
Retired Code Set
ICD-9-CM stopped being valid for U.S. claims with dates of service on or after October 1, 2015, when ICD-10-CM replaced it. Use this index for historical lookups and crosswalking; for current coding, start from the ICD-10-CM codes list or the ICD-9 / ICD-10 converter.
Code Blocks in This Section 4 blocks · 7 codes
| Range | Block | Codes |
|---|---|---|
| 540.0-540.9 | 540 Acute appendicitis | 3 |
| 541 | 541 Appendicitis, unqualified | 1 |
| 542 | 542 Other appendicitis | 1 |
| 543.0-543.9 | 543 Other diseases of appendix | 2 |
The info icon previews what each row contains.
Questions About This Page
How many codes are in the 540-543 section?
The 540-543 section contains 7 legacy diagnosis codes across 4 code blocks in the final ICD-9-CM release.
Can I still use these codes on claims?
No. ICD-9-CM was retired on October 1, 2015. To code appendicitis today, use the current ICD-10-CM codes: every legacy code page in this range links its official replacement, and the ICD-9 / ICD-10 converter translates codes in both directions.
Related References
Source: final CMS ICD-9-CM release (version date October 1, 2014). Retired from U.S. claims after September 30, 2015.
