Help on best to approach SQL coding of ICD-9s

I'm sure this is familiar to anyone having various health codes that have a mixture of alphanumeric characters.

For the simplest ones (skipping the ones that begin with "V"), I *thought* I was ok when converting the '001 - 999.99' range that is currently stored as a VARCHAR into an INT with a series of CASE statements for each grouping of ranges (although I realize these are actually decimal values but I haven't figured out how to add precision and scale in an applicable way)

For ex.

CASE WHEN CAST(mcd.LINE_DIAG1 AS INT) BETWEEN 001 AND 139.99 --convert STRING TO INTEGER FOR EASIER SEARCHING
      THEN 'Infectious and Parasitic Diseases'

But some of the data is not converting and I'm getting errors such as:

"Conversion failed when converting the varchar value '250.00' to data type int"

Maybe someone has been in this situation and could offer suggestions?

Many thanks in advance!
britpopfan74Asked:
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OCDanCommented:
convert(decimal(18,2),@test) instead of the cast as INT, seems to work ok for me.

declare @test varchar(10)
set @test = '129.99'

select CASE WHEN convert(DECIMAL(18,2),@test) BETWEEN 001 AND 139.99
      THEN 'Infectious and Parasitic Diseases'
     ELSE 'failed'
     END

Returns 'Infectious and Parasitic Diseases'
If is set @test to 140.00 it returns 'failed'

ALSO as you said you are dealing with some that have letters in front this may help:

declare @test varchar(10)
set @test = 'ABC129.99'

SELECT
CASE WHEN
convert(DECIMAL(18,2),substring(@test, PATINDEX ('%[0-9]%',@test) ,len(@test)))
BETWEEN 001 and 139.99
THEN 'Infectious and Parasitic Diseases'
ELSE 'failed'
END
--returns 'Infectious and Parasitic Diseases'

What this does is looks for the first number within the string and then trims everything before that point.

Hope it helps.
britpopfan74Author Commented:
Thank you so much for help with the conversion...

If I want the @test variable to be dynamic -- the mcd.LINE_DIAG1 is pulling the literal diagnosis from the claim at runtime -- how may I make this occur?
OCDanCommented:
just replace every occurence of @test with mcd.LINE_DIAG1 and it will work perfectly fine.

e.g.
select CASE WHEN convert(DECIMAL(18,2),mcd.LINE_DIAG1) BETWEEN 001 AND 139.99
      THEN 'Infectious and Parasitic Diseases'
     ELSE 'failed'
     END

and

SELECT
CASE WHEN
convert(DECIMAL(18,2),substring(mcd.LINE_DIAG1, PATINDEX ('%[0-9]%',mcd.LINE_DIAG1) ,len(mcd.LINE_DIAG1)))
BETWEEN 001 and 139.99
THEN 'Infectious and Parasitic Diseases'
ELSE 'failed'
END

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britpopfan74Author Commented:
Thank you very much!
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Microsoft SQL Server 2005

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