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For each code, return TRUE if numeric or FALSE if a V or E code.
TRUE
FALSE
icd9_is_n(x)icd9_is_v(x)icd9_is_e(x)
icd9_is_v(x)
icd9_is_e(x)
vector of strings or factor to test
logical vector
icd9_is_v: are the given codes V type?
icd9_is_v
icd9_is_e: are the given codes E type?
icd9_is_e