Sequence number – central

Source of standard: North American Association of Central Cancer Registriesexternal icon

Source item name: Sequence Number – Central

Source item number: 380external icon

This variable indicates the sequence of all reportable neoplasms over the patient’s lifetime.

Considerations for Use

  • The sequence number may change over the patient’s lifetime. If the patient was diagnosed with a single reportable neoplasm, and later diagnosed with a second reportable neoplasm, the sequence code for the first neoplasm changes from 00 to 01. A central registry may find that a patient with one or more known neoplasms had an earlier reportable neoplasm that had been unknown to the registry. Typically, a re-evaluation of all related sequence numbers is required whenever an additional neoplasm is identified.
  • Standards define which neoplasmsexternal icon are reportable. It is assumed that these standards are the minimum definition of reportability. Individual central cancer registries may define additional neoplasms as reportable. Variability of assigning sequence numbers over time may exist for different registries, which may impact the coding of this variable.
  • Because the time period of Sequence Number is a person’s lifetime, reportable neoplasms not included in the central registry (those that occur outside the registry catchment area or before the reference date) also are allotted a sequence number. For example, a registry may contain a single record for a patient with a sequence number of 02 because the first reportable neoplasm preceded the central registry’s reference date.
  • If two or more reportable neoplasms are diagnosed at the same time, the lowest sequence number is assigned to the diagnosis with the worst prognosis. If no difference in prognosis is evident, the decision is arbitrary.
  • Reportable non-malignant tumors diagnosed on or after January 1, 2004 are represented by sequence numbers labeled as “…state registry-defined neoplasm”. Timing rules for sequencing these neoplasms are the same as timing rules for sequencing required in situ or invasive neoplasms.
  • The 2007 Multiple Primary and Histology Coding Rules pdf icon[PDF-552KB]external icon may also affect the sequence number.
data/seq-num-us.json

1 Values are not reported due to the need for complementary cell suppression.
2 Subsequent primaries (7 or higher) were collapsed into this category.
3 Counts of fewer than 16 cases and the corresponding percentages are suppressed.

data/seq-num-uspr.json

1 Values are not reported due to the need for complementary cell suppression.
2 Subsequent primaries (7 or higher) were collapsed into this category.
3 Counts of fewer than 16 cases and the corresponding percentages are suppressed.