Y99.8 – Other external cause status
ICD-10-CM 2027 diagnosis code · Supplementary factors related to causes of morbidity classified elsewhere
ICD-10-CM code
Y99.8
- Code
Y99.8(claims format:Y998)- Description
- Other external cause status
- Billable
- Yes – valid for HIPAA-covered transactions
- Valid for
- Dates of service October 1, 2026 – September 30, 2027 (FY2027)
- Chapter
- 20. External causes of morbidity (V00-Y99)
- Block
- Y90-Y99 Supplementary factors related to causes of morbidity classified elsewhere
- Parent codes
- Y99
Notes for Y99.8
Applicable to:
- 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
Notes inherited from parent codes
Instructional notes at a category or block level apply to every code below it.
Y99 – External cause status
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.
Block Y90-Y99
Notes:
- These categories may be used to provide supplementary information concerning causes of morbidity. They are not to be used for single-condition coding.
Related codes in Y99
Frequently asked questions
What is ICD-10 code Y99.8?
Y99.8 is the ICD-10-CM code for other external cause status, in the block Y90-Y99 (Supplementary factors related to causes of morbidity classified elsewhere).
Is Y99.8 a billable code?
Yes. Y99.8 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.
What category does Y99.8 belong to?
It belongs to category Y99 – External cause status.
Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.