Billable / Specific Code
ICD-10-CM S40.842 is the diagnosis code for External constriction of left upper arm. This code falls under the section "Injuries to the shoulder and upper arm" 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 S40.842 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, S40.842 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
S40.842 is the ICD-10-CM diagnosis code for "External constriction of left upper arm". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of S40.842 is S40.84 ("External constriction of upper arm"). S40.842 provides a more specific classification within this category.
S40.842 is located in Section S40-S49 — "Injuries to the shoulder and upper arm" within Chapter 19 of the ICD-10-CM Tabular List.
Use S40.842 when the patients documented diagnosis matches "External constriction of left upper arm" 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 of left upper arm is S40.842.
Yes, S40.842 can be used as a primary diagnosis code since it is billable and specific.
S40.842 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, S40.842 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.