Billable / Specific Code
ICD-10-CM T40.416 is the diagnosis code for Underdosing of fentanyl or fentanyl analogs. This code falls under the section "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" 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 T40.416 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, T40.416 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
T40.416 is the ICD-10-CM diagnosis code for "Underdosing of fentanyl or fentanyl analogs". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of T40.416 is T40.41 ("Poisoning by, adverse effect of and underdosing of fentanyl or fentanyl analogs"). T40.416 provides a more specific classification within this category.
T40.416 is located in Section T36-T50 — "Poisoning by, adverse effect of and underdosing of drugs, medicaments and biological substances" within Chapter 19 of the ICD-10-CM Tabular List.
Use T40.416 when the patients documented diagnosis matches "Underdosing of fentanyl or fentanyl analogs" 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 Underdosing of fentanyl or fentanyl analogs is T40.416.
Yes, T40.416 can be used as a primary diagnosis code since it is billable and specific.
T40.416 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, T40.416 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.