Z59.819Housing instability, housed unspecified

Z59.819 is the ICD-10-CM diagnosis code for housing instability, housed unspecified. It belongs to category Z59 (problems related to housing and economic circumstances), block Z55-Z65 (persons with potential health hazards related to socioeconomic and psychosocial circumstances) and chapter 21 (factors influencing health status and contact with health services). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within Z59.81, choose Z59.819 (unspecified) only when documentation doesn't support a more specific option: with risk of homelessness (Z59.811) and homelessness in past 12 months (Z59.812).

The conditions in its Excludes2 note aren't part of Z59.819, but may be coded alongside it if the patient has both: extreme poverty (Z59.5), financial insecurity (Z59.86-), low income (Z59.6) and material hardship due to limited financial resources, not elsewhere classified (Z59.87).

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

In MS-DRG v44.0, it is part of the grouping logic for DRG 951 (Other Factors Influencing Health Status, relative weight 0.5577), in MDC 23 (Factors Influencing Health Status and Other Contacts with Health Services), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It is not acceptable as the principal diagnosis for an inpatient stay; it may be reported as a secondary diagnosis.

It is exempt from present-on-admission (POA) reporting, so no POA indicator is required.

It was added in FY2022, effective October 1, 2021.