Billable / Specific Code
ICD-10-CM K35.209 is the diagnosis code for Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation. This code falls under the section "Diseases of appendix" within Chapter 11 — Diseases of the digestive system (K00-K95). It is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes. Medical coders and healthcare providers use this code to document and classify diagnoses in electronic health records, insurance claims, and clinical databases.
Understanding where K35.209 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, K35.209 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
K35.209 is the ICD-10-CM diagnosis code for "Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of K35.209 is K35.20 ("Acute appendicitis with generalized peritonitis, without abscess"). K35.209 provides a more specific classification within this category.
K35.209 is located in Section K35-K38 — "Diseases of appendix" within Chapter 11 of the ICD-10-CM Tabular List.
Use K35.209 when the patients documented diagnosis matches "Acute appendicitis with generalized peritonitis, without abscess, unspecified as to perforation" 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 with generalized peritonitis, without abscess, unspecified as to perforation is K35.209.
Yes, K35.209 can be used as a primary diagnosis code since it is billable and specific.
K35.209 is in Chapter 11 of the ICD-10-CM Tabular List.
Yes, K35.209 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.