SEER Logo

SEER Training Modules

Coding M Equivalent

See the slide that shows how the registrar codes in CS to obtain the "M" in "TNM".

CS Metastasis at Diagnosis

This data field identifies the distant site(s) of metastatic involvement at diagnosis.

Code Description
00 No; none
10 Distant lymph node(s)
40 Distant metastases except code 10
Distant metastasis, NOS
Carcinomatosis
Site-specific codes where needed
50 (40) + (10)
99 Unknown; distant metastasis cannot be assessed; not stated in patient record

Click here to see the General Rules for Coding M Equivalent.