# Revision

A *revision procedure* may or may not be a subtype of the original procedure. Revision procedure concepts should be in the 118635009 |Revision (procedure)| subhierarchy.

* For example,
  * 171839006 |Re-release of carpal tunnel (procedure)| is modeled as follows:

<figure><img src="https://4060284305-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FuoSxuN6wQMDYcvuq2wNX%2Fuploads%2FzIqlm1PxYEVfC8EiaSWt%2Fimage.png?alt=media&#x26;token=7e177023-0861-4faa-af9c-d75e13567531" alt=""><figcaption><p>Stated view of 171839006 |Re-release of carpal tunnel (procedure)|</p></figcaption></figure>

<figure><img src="https://github.com/SNOMED-Documents/snomed-editorial-guide/blob/main/authoring/procedure/images/174691290.png" alt=""><figcaption></figcaption></figure>

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