Y99 ICD-10-CM Code: External cause status
A clear reference for the official code description, hierarchy, and related coding information from the FY 2027 U.S. release.
Code definition
Official description
Y99External cause status
ICD-10-CM diagnosis code · United States clinical modification
Classification
Where Y99 sits
- 1
Chapter 20
External causes of morbidity (V00-Y99)
- 2
Section
Supplementary factors related to causes of morbidity classified elsewhere (Y90-Y99)
- 3
Category Y99
External cause status
- 4
Code Y99
External cause status
More specific choices
Codes under Y99
Y99 is a non-billable category. Choose the child code that best matches the documented diagnosis.
Documentation details
Notes for this code
Inclusion terms
No inclusion terms are listed for Y99.
Code first
No “code first” instruction is listed for Y99.
Use additional code
No “use additional code” instruction is listed for Y99.
Excludes1
Conditions that should not be reported together with this code.
No Excludes1 note is listed for Y99.
Excludes2
Conditions not included here that may be reported separately when present.
No Excludes2 note is listed for Y99.
Transparency
Source and release
This reference is generated from Vero’s ICD-10-CM description, hierarchy, and code-note dataset. The visible content and structured data share that source.
Review the CDC/NCHS ICD-10-CM sourceCode-specific guidance
Frequently asked questions
What does ICD-10-CM code Y99 mean?
Y99 is the FY 2027 U.S. ICD-10-CM code for “External cause status.”
Is Y99 a billable or specific ICD-10-CM code?
No. Y99 has more specific child codes in the FY 2027 reference data. Select the code that matches the documentation and confirm the active code set and payer requirements.
Where is Y99 located in ICD-10-CM?
Y99 is listed in Chapter 20, External causes of morbidity (V00-Y99), within Supplementary factors related to causes of morbidity classified elsewhere (Y90-Y99) (Y90–Y99), under category Y99, External cause status.
What coding notes are listed for Y99?
No inclusion terms are listed for Y99 in this reference record. No code-first instruction is listed. No Excludes1 note is listed. No Excludes2 note is listed.
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