Thank you for your inquiry regarding CMS826v4, Hospital Harm - Pressure Injury. Please find responses to your two questions below.   1. Yes. A stage 1 pressure injury present on admission is not a qualifying diagnosis for the measure's denominator exclusions criteria. So, if a patient has a stage 1 pressure injury diagnosis with a Present on Admission (POA) indicator of “Y” or "W", this inpatient hospitalization will remain in the denominator population and eligible for the numerator population. Therefore, if the pressure injury advances to a stage 2 pressure injury, and a provider documents findings of this stage 2 pressure injury from a skin exam after the first 24 hours of the hospitalization, or if the hospital assigns a POA indicator of "N" or "U" to the stage 2 pressure injury diagnosis, then the inpatient hospitalization for this patient would meet the measure's numerator criteria.   2. No. An inpatient hospitalization for a patient with a stage 2 pressure injury present on admission meets the measure's denominator exclusions criteria and is therefore removed from the measure's denominator and not considered for the measure's numerator. So, the patient's later development of an unstageable pressure injury would not qualify the hospitalization for the measure's numerator. [For follow-up questions submitted more than 30 days after the "Solution Posted On" date, please submit a new Jira ticket.]