2023 ICD-10-CM Diagnosis Code Y99.9

Unspecified external cause status

    2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code POA Exempt
  • Y99.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
  • The 2023 edition of ICD-10-CM Y99.9 became effective on October 1, 2022.
  • This is the American ICD-10-CM version of Y99.9 - other international versions of ICD-10 Y99.9 may differ.
ICD-10-CM Coding Rules
  • Y99.9 describes the circumstance causing an injury, not the nature of the injury.
The following code(s) above Y99.9 contain annotation back-references
Annotation Back-References
In this context, annotation back-references refer to codes that contain:
  • Applicable To annotations, or
  • Code Also annotations, or
  • Code First annotations, or
  • Excludes1 annotations, or
  • Excludes2 annotations, or
  • Includes annotations, or
  • Note annotations, or
  • Use Additional annotations
that may be applicable to Y99.9:
  • V00-Y99
    2023 ICD-10-CM Range V00-Y99

    External causes of morbidity

    • This chapter permits the classification of environmental events and circumstances as the cause of injury, and other adverse effects. Where a code from this section is applicable, it is intended that it shall be used secondary to a code from another chapter of the Classification indicating the nature of the condition. Most often, the condition will be classifiable to Chapter 19, Injury, poisoning and certain other consequences of external causes (S00-T88). Other conditions that may be stated to be due to external causes are classified in Chapters I to XVIII. For these conditions, codes from Chapter 20 should be used to provide additional information as to the cause of the condition.
    External causes of morbidity
  • Y90-Y99
    2023 ICD-10-CM Range Y90-Y99

    Supplementary factors related to causes of morbidity classified elsewhere

    • These categories may be used to provide supplementary information concerning causes of morbidity. They are not to be used for single-condition coding.
    Supplementary factors related to causes of morbidity classified elsewhere
  • Y99
    ICD-10-CM Diagnosis Code Y99

    External cause status

      2016 2017 2018 2019 2020 2021 2022 2023 Non-Billable/Non-Specific Code
    • 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.
    External cause status
Present On Admission
POA Help
"Present On Admission" is defined as present at the time the order for inpatient admission occurs — conditions that develop during an outpatient encounter, including emergency department, observation, or outpatient surgery, are considered POA.
  • Y99.9 is considered exempt from POA reporting.

Convert Y99.9 to ICD-9-CM

Code History
  • 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
  • 2017 (effective 10/1/2016): No change
  • 2018 (effective 10/1/2017): No change
  • 2019 (effective 10/1/2018): No change
  • 2020 (effective 10/1/2019): No change
  • 2021 (effective 10/1/2020): No change
  • 2022 (effective 10/1/2021): No change
  • 2023 (effective 10/1/2022): No change

External Cause Index entries containing back-references to Y99.9:

ICD-10-CM Codes Adjacent To Y99.9
Y93.84 Activity, sleeping
Y93.85 Activity, choking game
Y93.89 Activity, other specified
Y93.9 Activity, unspecified
Y95 Nosocomial condition
Y99 External cause status
Y99.0 Civilian activity done for income or pay
Y99.1 Military activity
Y99.2 Volunteer activity
Y99.8 Other external cause status
Y99.9 Unspecified external cause status
Z00 Encounter for general examination without complaint, suspected or reported diagnosis
Z00.0 Encounter for general adult medical examination
Z00.00 …… without abnormal findings
Z00.01 …… with abnormal findings
Z00.1 Encounter for newborn, infant and child health examinations
Z00.11 Newborn health examination
Z00.110 Health examination for newborn under 8 days old
Z00.111 Health examination for newborn 8 to 28 days old
Z00.12 Encounter for routine child health examination
Z00.121 …… with abnormal findings

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.