California Cancer Reporting System Standards Volume I: Abstracting and Coding Procedures for Hospitals
Beginning with cases diagnosed January 1, 2007 forward, the 2007 Multiple Primary and Histology Rules must be used to determine the number of primaries.
When determining multiple primaries for solid malignant tumors, do not use a physician's statement to decide whether the patient has a recurrence of a previous cancer or a new primary. Use the multiple primary rules as written unless a pathologist compares (slide review) the present tumor to the "original" tumor and states that this tumor is a recurrence of a cancer from the previous primary.
Do not apply these rules to cases diagnosed prior to January 1, 2007. Refer to the 2007 Multiple Primary and Histology Coding Rules Manual for details and instructions.
This does not apply to metastatic tumors.
In applying MP/H rules, tumor recurrences only relate to the organ of origin. Metastatic tumors in regional and distant site are not considered tumor recurrences when applying the MP/H rules.
See Section VII.2.12
For historic coding instructions, please click here.