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 the etiology/manifestation convention. The code title indicates that it is a manifestation code. "In diseases classified elsewhere" codes are never permitted to be used as first listed or principleprincipal [sic] diagnosis codes. They must be used in conjunction with an underlying condition code and they must be listed following the underlying condition.

A code also note instructs that 2 codes may be required to fully describe a condition but the sequencing of the two codes is discretionary, depending on the severity of the conditions and the reason for the encounter.

'''For codes less than 6 characters that require a 7th character a placeholder X should be assigned for all characters less than 6. The 7th character must always be the 7th character of a code''' 



This chapter contains the following blocks:

ICD 10 CM Tabular