ICD-10-CM K35 is the diagnosis code for Acute appendicitis. This code falls under the section "Diseases of appendix" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a non-billable/non-specific ICD-10-CM code that should not be used for reimbursement. A more specific sub-code is required for billing. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Always refer to the official ICD-10-CM Tabular List for complete coding guidelines. Ensure documentation supports the specificity of the code selected. When in doubt, consult a certified medical coder or the latest CMS guidelines.
Understanding where K35 sits in the ICD-10-CM classification helps ensure proper coding:
No, K35 is a non-billable/non-specific code. You should use a more specific sub-code for billing and reimbursement.
K35 is the ICD-10-CM diagnosis code for "Acute appendicitis". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
K35 is located in Section K35-K38 — "Diseases of appendix" within Chapter 11 of the ICD-10-CM Tabular List.
K35 has 3 sub-code(s) that provide more specific detail: K35.2, K35.3, K35.8.
Use K35 when the patients documented diagnosis matches "Acute appendicitis" and the clinical documentation supports this level of specificity. Always verify with the latest ICD-10-CM guidelines and payer requirements.
The ICD-10-CM code for Acute appendicitis is K35.
No, K35 is non-billable. Use a more specific sub-code for primary diagnosis billing.
K35 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K35 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.