Y = Condition present at the time of inpatient admission.

N = Condition not present at the time of inpatient admission.

U = Documentation is insufficient to determine if condition was present on admission.

W = Provider is unable to clinically determine whether condition was present on admission or not.

1 = Unreported/not used -- exempt from POA reporting -- this code is the equivalent code of a blank, however, it was determined that blanks were undesirable when submitting the data.

Z = Denotes the end of the POA indicators

X = Denotes the end of the POA indicators in special data processing situations that may be identified by CMS in the future.