2026 ICD-10-CM Diagnosis Code Z59.812Housing instability, housed, homelessness in past 12 months

ICD-10-CM Codes›Z00–Z99›Z55-Z65›Z59

ICD-10-CM Z59.812
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

Z59.812 is a billable ICD-10-CM diagnosis code for housing instability, housed, homelessness in past 12 months. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026). The code is not accepted as a principal diagnosis by the Medicare Code Editor and exempt from POA reporting. Coders also document this condition as housing instability. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Socioeconomic/psychosocial factors.

Code Identity

ICD-10-CM Code
Z59.812
Billable Status
Yes — Valid for Submission
Code Describes
Housing instability, housed, homelessness in past 12 months
Short Description
Housing instability, housed, homelessness in past 12 months
Same as the full description in the CMS dataset.
Parent Code
Z59.81
Housing instability, housed

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ55-Z65Persons with potential health hazards related to socioeconomic and psychosocial circumstances
CategoryZ59Problems related to housing and economic circumstances
This CodeZ59.812Housing instability, housed, homelessness in past 12 months

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z59.812.

Unacceptable principal diagnosis
There are selected codes that describe a circumstance which influences an individual's health status but not a current illness or injury, or codes that are not specific manifestations but may be due to an underlying cause. These codes are considered unacceptable as a principal diagnosis.

Present on Admission (POA)Billing

Z59.812 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review other POA exempt codes.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Housing instability
  • Housing instability following recent homelessness

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Instability
      • housing
        • housed
          • homelessness in past 12 months

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR FAC019
Socioeconomic/psychosocial factors
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Housing Instability

    this encompasses a number of challenges, such as having trouble paying rent, living in overcrowded conditions, moving frequently, living with friends or relatives out of necessity, being unhoused, or spending the bulk of household income (>50%) on housing. (https://www.healthypeople.gov/2020/topics-objectives/topic/social-determinants-health/interventions-resources/housing-instability)

Code History & ChangesHistory

Replacement Z59.812 replaces the following previously assigned code(s):

  • Z59.8 - Other problems related to housing and economic circumstances
FY 2022AddedAdded to the ICD-10-CM code setEffective October 1, 2021.
FY 2023–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About Z59.812Overview

Is Z59.812 (Housing instability, housed) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report housing instability, housed, homelessness in past 12 months on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Can Z59.812 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because housing instability, housed, homelessness in past 12 months describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z59.812 exempt from POA reporting?

Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for housing instability, housed, homelessness in past 12 months on inpatient claims.