In SNOMED CT, the verb form describing the clinical action within a fully specified name and a preferred term should be the ending -ion, not -ing.
The -ing ending may be used when there is not an -ion or other appropriate verb form and when the -ing form is in common usage.
A past tense verbal phrase should not be used to name a procedure, since it indicates that the procedure was done in the past.
However, the following is an acceptable example using a noun phrase,
Existing descriptions containing past tense verbs should be moved to the Situation with explicit context hierarchy.