Collaborative Stage

Note 1: Code exact tumor measurements when available. Use codes 990-997 only if a specific measurement is not available.
Note 2: The assignment of T categories for gastrointestinal stromal tumors (GIST) is based on tumor size. A physician's statement of the T category may be used to code CS Tumor Size and/or CS Extension if this is the only information in the medical record regarding one or both of these fields. However the two fields are coded independently: for example the record may document size but not extension, other than the physician's statement of the T category. Use codes 992, 995, 996, and 997 as appropriate to code CS Tumor Size based on a statement of T when no other size information is available.
Note 3: Codes 992-995 were obsolete in CS Version 2, V0201 and V0202. They are made active in V0203. Codes 996-997 are new for V0203. Tumors that now fall into one of these categories would have been coded as 011, 021, 051, 101, or 999 in V0201/V0202.

Code	Description
000	No mass/tumor found
001-988	001 - 988 millimeters (mm) (Exact size to nearest mm)
989	989 mm or larger
990	Microscopic focus or foci only and no size of focus given
991	Described as "less than 1 centimeter (cm)"
992	Described as "less than 2 cm," or "greater than 1 cm," or "between 1 cm and 2 cm" Stated as T1 with no other information on size
993	Described as "less than 3 cm," or "greater than 2 cm," or "between 2 cm and 3 cm"
994	Described as "less than 4 cm," or "greater than 3 cm," or "between 3 cm and 4 cm"
995	Described as "less than 5 cm," or "greater than 4 cm," or "between 4 cm and 5 cm" Stated as T2 with no other information on size Note: "Stated as T2 with no other information on size" moved from code 993 to code 995 in V0204
996	Described as "less than 10 cm," or "greater than 5 cm" or "between 5 cm and 10 cm" Stated as T3 with no other information on tumor size
997	Described as "greater than 10 cm" Stated as T4 with no other information on tumor size
999	Unknown; size not stated Size of tumor cannot be assessed Not documented in patient record

CS Tumor Size