Let me guess - you're doing a report on all patients that had a diagnosis of type yadayadayada and they want to exclude the diagnosis for blahblahblah. You were also told that this was a one-off report and they'd never want to do the same thing, but with the code for something else excluded.

Do yourself a favor and put this into a database. I'm going to assume that each line is a patient. So, create a patient table and a diagnosis table. Then, you can do something like:

SELECT patient.id
  FROM patient, diagnosis
 WHERE diagnosis.patient = patient.id
   AND diagnosis.code BETWEEN (296.1 AND 314.0)
   AND NOT EXISTS (
        SELECT patient
          FROM diagnosis d_int
         WHERE d_int.patient = patient.id
           AND d_int.code = 305.1
       )
[download]

Or something like that. The benefit here is that you have the data in a database for the next stupid question you get asked.