Continuation of PART 2 Etiology/Manifestation Convention Certain conditions have both an underlying etiology and multiple body system manifestations due to the underlying etiology. For such conditions, the ICD-10-CM has a coding convention that requires the underlying condition to be sequenced first , if applicable, followed by the manifestation. Wherever such a combination exists, there is a “use additional code” note at the etiology code, and a “code first” note at the manifestation code. These instructional notes indicate the proper sequencing order of the codes, etiology followed by manifestation. In most cases, the manifestation codes will have in the code title, “in diseases classified elsewhere.” Codes with this title are components of the etiology/ manifestation convention. There are manifestation codes that do not have “in diseases classified elsewhere” in the title. For such codes, there is a “use additional code” note at the etiology code and a “code fi
The Codepedia for Medical Coding