DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

Y99 External cause status

  • Header · not billable

Y99 is not billable. The category heads 5 billable codes in FY2027: the 5 codes directly below it.

Where it sits

  1. Chapter 20 External causes of morbidity (V00-Y99)
  2. Y90-Y99 Supplementary factors related to causes of morbidity classified elsewhere (Y90-Y99)
  3. Y99 External cause status
Billable codes
5
Subdivisions
5
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
0

Codes in Y99

  1. Y99.0
    Civilian activity done for income or pay
    BillableExempt
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    • Civilian activity done for financial or other compensation

    Excludes1

    • military activity (Y99.1) Y99.1
    • volunteer activity (Y99.2) Y99.2
  2. Y99.1
    Military activity
    BillableExempt
    Excludes1 1

    Excludes1

    • activity of off duty military personnel (Y99.8) Y99.8
  3. Y99.2
    Volunteer activity
    BillableExempt
    Excludes1 1

    Excludes1

    • activity of child or other family member assisting in compensated work of other family member (Y99.8) Y99.8
  4. Y99.8
    Other external cause status
    BillableExempt
    Inclusion terms 7, Excludes1 2

    Inclusion terms

    • Activity NEC
    • Activity of child or other family member assisting in compensated work of other family member
    • Hobby not done for income
    • Leisure activity
    • Off-duty activity of military personnel
    • Recreation or sport not for income or while a student
    • Student activity

    Excludes1

    • civilian activity done for income or compensation (Y99.0) Y99.0
    • military activity (Y99.1) Y99.1
  5. Y99.9
    Unspecified external cause status
    BillableExempt

Sources of each column.

Instructions

At Y99

Notes

  • A single code from category Y99 should be used in conjunction with the external cause code(s) assigned to a record to indicate the status of the person at the time the event occurred. Y99

Notes that also apply

Block Y90-Y99 instructions (Notes 1): printed on the block page.

Chapter 20 instructions (Notes 1): printed on the chapter 20 page.

Hierarchy