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Report Produced: 01/17/2026 10:34 AM

Report Question ID Question Discussion Answer Year
20031094 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Breast: How many primaries are coded and what code(s) is/are used to represent the histology "invasive ductal carcinoma with extensive spindle metaplastic change [metaplastic carcinoma] with a second, separate, tumor "invasive ductal carcinoma, moderately differentiated with extensive associated DCIS"? See Description. The comment on the pathology report states, "due to the associated DCIS this smaller lesion is felt to most likely represent a synchronous second primary." Is this two primaries, one coded 8575/33 and the other coded 8500/32 or is this a single primary with a combination code -- 8523/33?

For tumors diagnosed prior to 2007:

Abstract as two breast primaries. Code to 8575/33 (metaplastic carcinoma) and 8500/32 (infiltrating duct carcinoma). There are two lesions with different histologic types.

Do not use code 8523 to combine separate tumors with different histologies.

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.

 2003
20061138 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Breast: How many primaries are to be abstracted and how is the histology field(s) coded when a nipple biopsy demonstrates Paget disease and a separate biopsy in the same breast demonstrates inflammatory breast carcinoma? See Discussion. Should Paget disease be coded as the histology because it has a higher histology code than inflammatory carcinoma?

For tumors diagnosed prior to 2007:

Abstract the inflammatory carcinoma as one primary and the Paget disease as a separate primary. The first three digits of the histology codes for these histologies are different (8530 and 8540). Therefore, these are separate primaries.

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.

 2006
20031127 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Breast: Would the simultaneously occurring histologies of "high grade ductal carcinoma in situ with micro invasion" and "keratinizing squamous cell carcinoma" be coded as two primaries or as a single primary when the pathologist is not clear whether two separate tumor masses exist?

For tumors diagnosed prior to 2007:

Code as two primaries, assuming the tumors are separate and the margins are clear/negative. Code 8071/3 [Invasive squamous cell ca, keratinizing] and 8500/3 [Ductal carcinoma, "microinvasive"].

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.

 2003
20041042 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Kidney: How many primaries, with what histology(ies) should be coded when nephrectomy pathology specimen shows separate tumors of "renal cell carcinoma [clear cell type]" and "renal cell carcinoma [granular cell type]"?

For tumors diagnosed prior to 2007:

Abstract two primaries. This is an example of two tumors with different histologic types in the same site. The right kidney has two separate tumors.

8310/3 [renal cell carcinoma (clear cell type)]

8320/3 [renal cell carcinoma (granular cell type)]

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.

 2004
20051001 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Lung: How is histology coded for the tumor(s) that exist if a left upper lobe of lung resection final diagnosis states the patient has a moderately differentiated adenocarcinoma and the path indicates there are "multiple carcinoid tumorlets"?

For tumors diagnosed prior to 2007:

Histology is coded 8140/3 [adenocarcinoma]. This is one reportable tumor of the left lung. According to our pathologist consultant, the tumorlets are collections of cells which appear to be of neuroendocrine origin, but are not malignant.

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.

 2005
20010161 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?

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.

 2001
20061142 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Skin: How many cases are to be abstracted and how is the histology field(s) coded for cases in which a fibrosarcoma arises in or transforms from a dermatofibrosarcoma protuberans? See Discussion.

1. If the fibrosarcoma occurs after DFP, and is called metastatic, is it a recurrence or is it a new primary? Example: Pt diagnosed in 7/05 with a high grade fibrosarcoma arising in a dermatofibrosarcoma protuberans. The path indicated "The presence of high grade fibrosarcoma, the extent of the tumor necrosis and the mitotic rate are all adverse prognostic findings that indicate a significant risk for mets." The patient had a recurrence in 8/06 called a low grade fibrosarcoma mets from prev." The DFP code is 8832/3 and a fibrosarcoma code is 8810/3. Our pathologist feels that the fibrosarcoma is a more aggressive tumor so should the case be coded to the 8810/3.

2. If DFSP has areas of fibrosarcoma, should it be coded to the latter because it is more aggressive? Example: Skin and subcutaneous tissue reads: Low grade sarcoma - tumor extends to margin. Comment: "Although the predominant pattern of this tumor is consistent with dermatofibrosarcoma protuberans, focal presence of hypercellularity and increased mitotic figures suggest transformation to Grade I fibrosarcoma. This progression, although focal, carries an increased risk of mets over classic DFSP. Code to 8810/31?

For tumors diagnosed prior to 2007:

Code histology to 8832/3 [Dermatofibrosarcoma protuberans] for both cases. DFSP with transformation to fibrosarcoma and DFSP with areas of fibrosarcoma are coded to 8832/3.

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.

 2006
20061006 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Testis: If an orchiectomy specimen contains non-seminomatous mixed germ cell tumor and a separate satellite of seminoma, how many tumors should be abstracted and how should the histology field(s) be coded? Pathology: R Orchiectomy: 2.1 cm non-seminomatous mixed germ cell tumor (50% teratoma primarily mature, 50% embryonal CA and yolk sac tumor). Located 3cm from the main tumor is a 2mm satellite pure seminoma.

For tumors diagnosed prior to 2007:

This is a single primary because the first three digits of the ICD-O-3 histology codes are the same, according to Rule 3a on page 11 of the 2004 SEER manual. Code the histology 9065 [Germ cell tumor, nonseminomatous]. Code 9065 is preferred over the less-specific code of 9061 [Seminoma, NOS].

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.

 2006
20051006 Multiple Primaries (Pre-2007)/Histology (Pre-2007)--Thyroid: How is histology coded for the tumor(s) that exist when the thyroidectomy addendum diagnosis is "Morphologic and IHC evaluations reveal two tumors: papillary thyroid carcinoma and squamous cell carcinoma." See Discussion. The original final diagnosis after a thyroidectomy is "papillary carcinoma of the thyroid with an adjacent invasive squamous cell carcinoma, moderately differentiated." Per the additional addendum comment: "The findings can be interpreted in one of 2 different ways. Either there is a collision tumor of papillary thyroid and squamous cell carcinoma (with the squamous cell ca originating at a site other than the thyroid gland.) Or, less likely, there is a malignant squamous differentiation in the papillary thyroid carcinoma." A university hospital consultation report states the diagnosis as: "Spindle cell squamous cell carcinoma arising in association and from papillary carcinoma, predominantly tall cell variant..." Is this 2 thyroid primaries: 8344/3 [papillary carcinoma, tall cell] and 8074/3 [squamous cell carcinoma, spindle cell]?

For tumors diagnosed prior to 2007:

Our pathologist consultant agrees with the consultant's diagnosis. Therefore, abstract this as one primary of the thyroid. Code the histology as 8344 [Papillary tall cell]. This is the most appropriate histology code available for this complex case.

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.

 2005
20041037 Multiple Primaries (Pre-2007)/Histology (Pre-2007)/Grade, Differentiation--Thyroid: How many primaries, with what histologies should be coded when a thyroidectomy reveals "anaplastic carcinoma" and "papillary carcinoma" occurring as two separate tumors? See Discussion. Example: Thyroidectomy revealed anaplastic carcinoma of the thyroid with mets to lymph nodes. The path report stated that the thyroid specimen also contained a small papillary carcinoma. Differentiation for the papillary carcinoma was not stated.

For tumors diagnosed prior to 2007:

Accession and code as two thyroid primaries:

Anaplastic carcinoma [8021/34]

Papillary carcinoma [8260/39]

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.

 2004