Billable / Specific Code
ICD-10-CM T65.824 is the diagnosis code for Toxic effect of harmful algae and algae toxins, undetermined. This code falls under the section "Toxic effects of substances chiefly nonmedicinal as to source" within Chapter 19 — Injury, poisoning and certain other consequences of external causes (S00-T88). 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.
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 T65.824 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T65.824 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T65.824 is the ICD-10-CM diagnosis code for "Toxic effect of harmful algae and algae toxins, undetermined". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T65.824 is T65.82 ("Toxic effect of harmful algae and algae toxins"). T65.824 provides a more specific classification within this category.
T65.824 is located in Section T51-T65 — "Toxic effects of substances chiefly nonmedicinal as to source" within Chapter 19 of the ICD-10-CM Tabular List.
Use T65.824 when the patients documented diagnosis matches "Toxic effect of harmful algae and algae toxins, undetermined" 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 Toxic effect of harmful algae and algae toxins, undetermined is T65.824.
Yes, T65.824 can be used as a primary diagnosis code since it is billable and specific.
T65.824 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T65.824 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.