Billable / Specific Code
ICD-10-CM S90.549 is the diagnosis code for External constriction, unspecified ankle. This code falls under the section "Injuries to the ankle and foot" 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 S90.549 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, S90.549 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
S90.549 is the ICD-10-CM diagnosis code for "External constriction, unspecified ankle". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of S90.549 is S90.54 ("External constriction of ankle"). S90.549 provides a more specific classification within this category.
S90.549 is located in Section S90-S99 — "Injuries to the ankle and foot" within Chapter 19 of the ICD-10-CM Tabular List.
Use S90.549 when the patients documented diagnosis matches "External constriction, unspecified ankle" 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 External constriction, unspecified ankle is S90.549.
Yes, S90.549 can be used as a primary diagnosis code since it is billable and specific.
S90.549 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, S90.549 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.