Billable / Specific Code
ICD-10-CM S00.542 is the diagnosis code for External constriction of oral cavity. This code falls under the section "Injuries to the head" 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 S00.542 sits in the ICD-10-CM classification helps ensure proper coding:
Yes, S00.542 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
S00.542 is the ICD-10-CM diagnosis code for "External constriction of oral cavity". It is used by healthcare providers to classify and document this condition in medical records and insurance claims.
The parent code of S00.542 is S00.54 ("External constriction of lip and oral cavity"). S00.542 provides a more specific classification within this category.
S00.542 is located in Section S00-S09 — "Injuries to the head" within Chapter 19 of the ICD-10-CM Tabular List.
Use S00.542 when the patients documented diagnosis matches "External constriction of oral cavity" 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 oral cavity is S00.542.
Yes, S00.542 can be used as a primary diagnosis code since it is billable and specific.
S00.542 is in Chapter 19 of the ICD-10-CM Tabular List.
Yes, S00.542 is a valid ICD-10-CM code for the 2026 fiscal year, subject to official CMS updates.