UB04 Condition Codes Code P1: Do Not Resuscitate Order (DNR)

I cannot fulfill this request because the provided source documents do not contain any information about condition code P1 ("Do Not Resuscitate Order (DNR)"). The Noridian Condition Codes list (URL: https://med.noridianmedicare.com/web/jea/topics/claim-submission/condition-codes) includes only numeric codes 01–77 and does not reference P1. The MassHealth UB-04 Billing Guide (URL: https://www.mass.gov/doc/ub-04-billing-guide-0/download) does not list individual condition codes or mention P1. Without source content that mentions code P1 or DNR, I am unable to write the required sections (Overview, When to Use, Step-by-Step Claim Example, Common Mistakes & Audit Red Flags, Related Codes/Fields) in compliance with the absolute rules to trace every claim to the provided sources and cite every sentence. To create a valid article, please provide a source that explicitly documents condition code P1 and its meaning.