Hypercapnia - A clinical manifestation of abnormal increase in the amount of carbon dioxide in arterial blood.
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 be sequenced first 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.
- Codes from category Z3A are for use, only on the maternal record, to indicate the weeks of gestation of the pregnancy, if known.