Yes, substitution for one member is acceptable only if the organization cannot collect the chart because a practitioner is unable or unwilling to release it. The auditor has two options: he can select an original sample of 17 members (16 plus 1 oversample), and use the replacement member if the organization was unable to obtain a chart for one of the first 16 members, or he can send a 17th member when he is notified that one of the original 16 charts was unobtainable.
The auditors work papers should note which members chart was refused. If possible, the auditor should get a copy of the providers refusal letter or e-mail.
HEDIS 2013