DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

C31 Malignant neoplasm of accessory sinuses

  • Header · not billable

C31 is not billable. The category heads 6 billable codes in FY2027: the 6 codes directly below it.

Where it sits

  1. Chapter 2 Neoplasms (C00-D49)
  2. C30-C39 Malignant neoplasms of respiratory and intrathoracic organs (C30-C39)
  3. C31 Malignant neoplasm of accessory sinuses
Billable codes
6
Subdivisions
6
CC / MCC codes
0 / 0
HCC V28 codes
6
New FY2027
0
Index entries
0

Codes in C31

  1. C31.0
    Malignant neoplasm of maxillary sinus
    Billable21
    Inclusion terms 1

    Inclusion terms

    • Malignant neoplasm of antrum (Highmore) (maxillary)
  2. C31.1
    Malignant neoplasm of ethmoidal sinus
    Billable21
  3. C31.2
    Malignant neoplasm of frontal sinus
    Billable21
  4. C31.3
    Malignant neoplasm of sphenoid sinus
    Billable21
  5. C31.8
    Malignant neoplasm of overlapping sites of accessory sinuses
    Billable21
  6. C31.9
    Malignant neoplasm of accessory sinus, unspecified
    Billable21

Sources of each column.

Instructions

Notes that also apply

Block C30-C39 instructions (Includes 1, Excludes1 1): printed on the block page.

Chapter 2 instructions (Notes 8): printed on the chapter 2 page.

Hierarchy