Clinical Trial Number

SAS Name

The number used to identify all items and line item services provided to a beneficiary during their participation in a clinical trial.


CMS is requesting the clinical trial number be voluntarily reported. The number is assigned by the National Library of Medicine (NLM) Clinical Trials Data Bank when a new study is registered.

Effective September 1, 2008 with the implementation of CR#3.

Source: NCH

ResDAC Comment: Prior to January 2014, this field was optional. Beginning in January 2014, the field is mandatory for claims for services provided in clinical trials, studies or registries, or under coverage with evidence development (CED). This field is populated with the National Clinical Trial number (NCT), if known, or the value 99999999 if the NCT is not known to the provider. Clinical trial numbers on claims are not validated.