SEER Inquiry System - Question 20010161 Details

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Produced: 01/16/2026 3:10 PM

Question 20010161

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Inquiry Details

References:

#1: Coding Complex Morph Dx's, 2. Revised August 2002

#2: SEER Program Code Man, 3rd Ed, 97. Rule 2

Question:

Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Prostate: Radical prostatectomy reveals two distinct tumors. One is "adenocarcinoma with ductal differentiation" and the other is "adenocarcinoma with acinar differentiation." What code is used to represent the histology and how many primaries does the patient have?

Discussion:

Answer:

For tumors diagnosed 2001-2006:

This is one primary. Code the Histology field to 8255/3 [adenocarcinoma with mixed subtypes] based on rule A of the Coding Complex Morphologic Diagnoses. This is code was added in the ICD-O-3.

For tumors diagnosed 2007 or later, refer to the MP/H rules. If there are still questions about how this type of tumor should be coded, submit a new question to SINQ and include the difficulties you are encountering in applying the MP/H rules.

History:

This is coded as one primary. For cases diagnosed before 1/1/01: Code the Histology field to 8550/3 [acinar adenocarcinoma]. Acinar and ductal are considered subtypes of adenocarcinoma. When there are two histologies, ductal adenocarcinoma [8500/3] and acinar adenocarcinoma [8550/3], code to the higher histology code, per rule 2 of the SEER Program Code Manual because an applicable combination code did not exist prior to 2001.

Cancer Site Category:

Prostate

Data Item Category:

Histology

Other Category:

Multiple primaries

Year:

2001