Billable / Specific Code
ICD-10-CM S86.309 is the diagnosis code for Unspecified injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, unspecified leg. This code falls under the section "Injuries to the knee and lower leg" 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 S86.309 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, S86.309 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
S86.309 is the ICD-10-CM diagnosis code for "Unspecified injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, unspecified leg". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of S86.309 is S86.30 ("Unspecified injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level"). S86.309 provides a more specific classification within this category.
S86.309 is located in Section S80-S89 — "Injuries to the knee and lower leg" within Chapter 19 of the ICD-10-CM Tabular List.
Use S86.309 when the patients documented diagnosis matches "Unspecified injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, unspecified leg" 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 Unspecified injury of muscle(s) and tendon(s) of peroneal muscle group at lower leg level, unspecified leg is S86.309.
Yes, S86.309 can be used as a primary diagnosis code since it is billable and specific.
S86.309 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, S86.309 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.