V.3.5.3 Variation in Terms for Degree of Differentiation

Use the higher grade when different terms are used for the degree of differentiation as follows:

Term

Grade

Code

Low grade

I-II

2

Medium grade; intermediate grade

II-III

3

High grade

III-IV

4

Partially well differentiated

I-II

2

Moderately undifferentiated

III

3

Relatively undifferentiated

III

3

Occasionally a grade is written as "2/3" or "2/4" meaning this is grade 2 of a 3-grade system or grade 2 of a 4-grade system, respectively.

To code in a three grade system, refer to the following codes:

Histological Grade

Nuclear Grade

Description

Code

1/3, or I/III

1/2, 1/3

Low Grade

2

2/3, or II/III

2/3

Medium Grade

3

3/3, or III/III

2/2, 3/3

High Grade

4

 

To code in a two-grade system, refer to the following codes:

Histological Grade

Nuclear Grade

Code

1/2, or I/II

Low Grade

2

2/2, or II/II

High Grade

4

 

See Section V.3.5.11 Grade Path Value

See Section V.3.5.12 Grade Path System

 

 

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