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Is Class of Case just a random number?
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By Julie Bell, CTR, Quality Data Coordinator

When it comes to Class of Case, those numbers aren’t just random. Those two-digit codes actually relate two pieces of important information that determine if a case is analytic or non-analytic. For the purposes of this article, we will be looking at analytic cases, which are cases that are diagnosed at the reporting facility or staff physician office or receive at least some of their first-course treatment at the reporting facility.

Here are some key details to note when looking at these codes:

  • The first digit of the code describes where the patient is diagnosed with cancer.
    • If the code starts with a 0 or a 1, then the patient was diagnosed at the reporting facility or a staff physician’s office.
    • If the code starts with a 2, the patient was diagnosed at an outside facility and had some or all of their treatment at the reporting facility.
  • The second digit of the code describes where the patient received the first-course treatment for cancer or where the decision was made not to treat.
    • If the second code is a 0, then no treatment was given at the reporting facility, or the patient left the system prior to establishing a treatment plan.
    • If the second digit is a 1 or 3, then some of the first-course treatment was given at the reporting facility and some were given elsewhere.
    • If the second digit is a 2 or 4, all of the first-course treatment was given at the reporting facility.

To provide further examples, below is a list of the analytic Class of Case codes with their description. You can see how the codes follow the above descriptions.

  • 00 — Initial diagnosis at the reporting facility AND all treatment or a decision not to treat was done elsewhere.
  • 10 — Initial diagnosis at the reporting facility and it is unknown if or where they were treated for their cancer.
  • 11 — Initial diagnosis in a staff physician office AND part of the first course of treatment was done at the reporting facility
  • 12 — Initial diagnosis in a staff physician office AND all first-course treatment or a decision not to treat was done at the reporting facility
  • 13 — Initial diagnosis at the reporting facility AND part of the first-course treatment was done at the reporting facility; part of the first-course treatment was done elsewhere.
  • 14 — Initial diagnosis at the reporting facility AND all first-course treatment or a decision not to treat was done at the reporting facility.
  • 20 — Initial diagnosis elsewhere AND all or part of the first-course treatment was done at the reporting facility, Not Otherwise Specified
  • 21 — Initial diagnosis elsewhere AND part of the first-course treatment was done at the reporting facility; part of the first-course treatment was done elsewhere.
  • 22 — Initial diagnosis elsewhere AND all first-course treatment or a decision not to treat was done at the reporting facility.

So now you know, Class of Case is not just a random number. Each digit has a meaning and, together, the two digits give a quick snapshot of diagnosis and treatment. Visit us again for more insights into the Cancer Registry and click here to learn about non-analytic cases.

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