Z59.811 ICD-10-CM Code: Housing instability, housed, with risk of homelessness
HCC Buddy Code Card
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FY 2026 Apr update / Factors influencing health status and contact with health services (Z00-Z99) / Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65)
Z59.811
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceHousing instability, housed, with risk of homelessness
A person currently has housing but faces significant risk of becoming homeless in the near future.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Imminent risk of homelessness
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for Z59.811 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for Z59.811 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for Z59.811 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for Z59.811 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for Z59.811 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for Z59.811 in this effective period.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is Z59.811 an HCC code?
No. Z59.811 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
- Code
- Z59.811
- Description
- Housing instability, housed, with risk of homelessness
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
Z59.811 is the ICD-10-CM diagnosis code for housing instability, housed, with risk of homelessness. A person currently has housing but faces significant risk of becoming homeless in the near future. Z59.811 sits in the ICD-10-CM chapter for factors influencing health status and contact with health services (z00-z99), within the section covering persons with potential health hazards related to socioeconomic and psychosocial circumstances (z55-z65).
Z59.811 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Document specific risk factors such as eviction notices, inability to pay rent, or unstable living situations.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for Z59.811 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Document specific risk factors such as eviction notices, inability to pay rent, or unstable living situations
- •This code indicates current housing with future homelessness risk; do not use if person is already homeless