C18.1
BillableMalignant neoplasm of appendix
Malignant neoplasm of appendix
Coding Notes
Excludes 1
Codes that cannot be used together with this code (mutual exclusion)
- •Kaposi's sarcoma of gastrointestinal sitesC46.4
- malignant carcinoid tumors of the colon (C7A.02-)
Excludes 2
Conditions not included here, but the patient may have both
Related Codes(9)
C18.0Malignant neoplasm of cecum
C18.2Malignant neoplasm of ascending colon
C18.3Malignant neoplasm of hepatic flexure
C18.4Malignant neoplasm of transverse colon
C18.5Malignant neoplasm of splenic flexure
C18.6Malignant neoplasm of descending colon
C18.7Malignant neoplasm of sigmoid colon
C18.8Malignant neoplasm of overlapping sites of colon
C18.9Malignant neoplasm of colon, unspecified
ICD-11 Equivalents(1)
ICD-11 Equivalents
View full mappingCorresponding ICD-11 codes from the WHO crosswalk mapping
Also Known As / Clinical Terms(70)
SNOMED CT
- Primary malignant neoplasm of appendix93679002
- Appendiceal cancer363411007
- Malignant neoplasm of appendix363411007
- Malignant tumor of appendix363411007
- Malignant tumour of appendix363411007
- Adenocarcinoma of appendix413445002
- Carcinoma of appendix448992002
- Malignant epithelial neoplasm of appendix448992002
- Primary mucinous adenocarcinoma of appendix721672004
- Primary mucinous adenocarcinoma of digestive organ733356003
- Primary mucinous carcinoma of digestive organ733356003
- Lymphoma of appendix1153357001
- Malignant mesenchymal neoplasm of appendix1156812007
- Primary malignant mesenchymal neoplasm of appendix1254847003
- Primary mucinous adenocarcinoma of gastrointestinal tract1259448000
- Mucinous adenocarcinoma of gastrointestinal tract94291000119103
UMLS
- Appendiceal CancerC0496779
- Appendiceal cancerC0496779
- Appendix CancerC0496779
- Appendix cancerC0496779
- Cancer of AppendixC0496779
- Cancer of the AppendixC0496779
- Cancer, AppendicealC0496779
- Cancer, AppendixC0496779
- Malignant Appendix NeoplasmC0496779
- Malignant Appendix TumorC0496779
- Malignant Neoplasm of AppendixC0496779
- Malignant Neoplasm of Appendix VermiformisC0496779
- Malignant Neoplasm of the AppendixC0496779
- Malignant Tumor of AppendixC0496779
- Malignant Tumor of the AppendixC0496779
- Malignant neoplasm of appendixC0496779
- Malignant neoplasm of appendix (disorder)C0496779
- Malignant neoplasm of appendix vermiformisC0496779
- Malignant tumor of appendixC0496779
- Malignant tumour of appendixC0496779
- appendiceal cancerC0496779
- appendix cancerC0496779
- appendix tumor malignantC0496779
- cancer appendixC0496779
- cancer of appendixC0496779
- cancer of the appendixC0496779
Clinical Terms
- Malignant neoplasm of appendix (disorder)
- Primary mucinous adenocarcinoma of appendix
- cancer of appendix
- Cancer, Appendix
- Primary mucinous adenocarcinoma of digestive organ
- Malignant Appendix Neoplasm
- Malignant Appendix Tumor
- appendiceal cancer
- Appendix Cancer
- Carcinoma of appendix
- Malignant neoplasm of appendix vermiformis
- Malignant epithelial neoplasm of appendix
- Primary malignant mesenchymal neoplasm of appendix
- Cancer, Appendiceal
- Primary malignant neoplasm of appendix
- Malignant tumour of appendix
- Malignant Tumor of Appendix
- cancer of the appendix
- Malignant mesenchymal neoplasm of appendix
- Primary mucinous carcinoma of digestive organ
- Malignant Tumor of the Appendix
- Lymphoma of appendix
- Mucinous adenocarcinoma of gastrointestinal tract
- Primary mucinous adenocarcinoma of gastrointestinal tract
- cancer appendix
- Malignant Neoplasm of the Appendix
- appendix tumor malignant
- Adenocarcinoma of appendix
Frequently Asked Questions
What is the ICD-10 code for malignant neoplasm of appendix?
The ICD-10-CM code for malignant neoplasm of appendix is C18.1. The full clinical description is "Malignant neoplasm of appendix". C18.1 is a billable/specific code that can be used on insurance claims and medical billing.
What does ICD-10 code C18.1 mean?
ICD-10-CM code C18.1 represents “Malignant neoplasm of appendix”. It is classified under Chapter 2: Neoplasms and is a billable/specific code that can be used on a claim.
Is C18.1 a billable code?
Yes, C18.1 is a billable/specific ICD-10-CM code and can be used to indicate a diagnosis on a medical claim.
What chapter is C18.1 in?
C18.1 is in Chapter 2: Neoplasms (codes C00-D49).
What codes cannot be used with C18.1?
C18.1 has Excludes1 notes indicating codes that cannot be used together with it, including: Kaposi's sarcoma of gastrointestinal sites (C46.4); malignant carcinoid tumors of the colon (C7A.02-).
What SNOMED CT codes does C18.1 map to?
C18.1 maps to 11 SNOMED CT concepts: 413445002, 363411007, 448992002, 1153357001, 1156812007, and 6 more. SNOMED CT is a clinical terminology used in electronic health records.
What are the UMLS CUIs for C18.1?
C18.1 is linked to 1 UMLS Concept Unique Identifier: C0496779. The UMLS (Unified Medical Language System) integrates multiple biomedical vocabularies maintained by the U.S. National Library of Medicine.
How does C18.1 relate to ICF functioning codes?
ICF (International Classification of Functioning, Disability and Health) codes describe how conditions like malignant neoplasm of appendix affect a person's functioning: body functions, activities, participation, and environmental factors. AutoICD provides ICF Core Sets for 12+ conditions and can map clinical text to ICF categories automatically. Browse the ICF directory to explore functioning codes.
What is the ICD-11 equivalent of C18.1?
C18.1 maps to the ICD-11 code: 2B81.Z (Malignant neoplasms of appendix, unspecified).
Automate ICD-10 Coding With AI
Send clinical text to the AutoICD API and get back structured ICD-10 codes with confidence scores. Integrates into any EHR or billing system in minutes.
Includes SNOMED Clinical Terms® (SNOMED CT®) used by permission of SNOMED International. Includes content from the UMLS Metathesaurus, courtesy of the U.S. National Library of Medicine.