icd9ShortToDecimal: Convert ICD-9 codes between short and decimal forms
In jackwasey/icd9: Tools for Working with ICD-9 Codes, and Finding Comorbidities

Convert ICD-9 codes between short and decimal forms

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icd9ShortToDecimal(icd9Short)

icd9DecimalToShortOld(icd9Decimal)

`icd9Short`	is a character vector of ICD-9 codes. If fewer than five characters is given in a code, then the digits are greedily assigned to hundreds, then tens, then units, before the decimal parts. E.g. "10" becomes "010", not "0010"
`icd9Decimal`	character vector of ICD-9 codes. If fewer than five characters is given in a code, then the digits are greedily assigned to hundreds, then tens, then units, before the decimal parts. E.g. "10" becomes "010", not "0010"