Billable / Specific Code
ICD-10-CM S66.390 is the diagnosis code for Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level. This code falls under the section "Injuries to the wrist, hand and fingers" 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 S66.390 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, S66.390 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
S66.390 is the ICD-10-CM diagnosis code for "Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of S66.390 is S66.39 ("Other injury of extensor muscle, fascia and tendon of other and unspecified finger at wrist and hand level"). S66.390 provides a more specific classification within this category.
S66.390 is located in Section S60-S69 — "Injuries to the wrist, hand and fingers" within Chapter 19 of the ICD-10-CM Tabular List.
S66.390 has 1918 sub-code(s) that provide more specific detail: A00, A01, A02, A03, A04 and more.
Use S66.390 when the patients documented diagnosis matches "Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level" 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 Other injury of extensor muscle, fascia and tendon of right index finger at wrist and hand level is S66.390.
Yes, S66.390 can be used as a primary diagnosis code since it is billable and specific.
S66.390 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, S66.390 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.