Convert from short to decimal forms of ICD codes.
short_to_decimal(x)# S3 method for default
short_to_decimal(x)
# S3 method for icd9
short_to_decimal(x)
# S3 method for icd10
short_to_decimal(x)
# S3 method for icd10cm
short_to_decimal(x)
ICD codes
default: convert ICD codes of unknown type from short
to decimal format
icd9: convert ICD-9 codes from short to decimal
format
icd10: convert ICD-10 codes from short to decimal
format
icd10cm: convert ICD-10-CM code from short to decimal
format
Other ICD data conversion: comorbid_df_to_mat,
  comorbid_mat_to_df, convert,
  decimal_to_short,
  long_to_wide, wide_to_long