2027 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 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

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 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 951. 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 the other POA exempt codes in Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Housing instability
  • Housing instability following recent homelessness

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z59.812: its own notes plus those printed at Z59 and Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Z59 Problems related to housing and economic circumstances applies to 25 codes
  • problems related to upbringing (Z62.-)

Notes

General instructions on how these codes are used.

From Chapter 21 (Z00-Z99) Factors influencing health status and contact with health services applies to 1,425 codes
  • Z codes represent reasons for encounters. A corresponding procedure code must accompany a Z code if a procedure is performed. Categories Z00-Z99 are provided for occasions when circumstances other than a disease, injury or external cause classifiable to categories A00-Y89 are recorded as 'diagnoses' or 'problems'. This can arise in two main ways:
  • (a) When a person who may or may not be sick encounters the health services for some specific purpose, such as to receive limited care or service for a current condition, to donate an organ or tissue, to receive prophylactic vaccination (immunization), or to discuss a problem which is in itself not a disease or injury.
  • (b) When some circumstance or problem is present which influences the person's health status but is not in itself a current illness or injury.

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name Z59.812, its category, or a range that includes it.

Excludes2 3

These codes carry an Excludes2 note naming Z59.812: its condition is not part of those codes, and both may be reported when the patient has both.

  • Z56 Problems related to employment and unemployment
    problems related to housing and economic circumstances (Z59.-) names Z59.-, which includes this code
  • Z59.12 Inadequate housing utilities
    other problems related to housing and economic circumstances (Z59.8-) names Z59.8-, which includes this code
  • Z62 Problems related to upbringing
    problems related to housing and economic circumstances (Z59.-) names Z59.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

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

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

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 2023–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z59.812Overview

What is the ICD-10 code for housing instability, housed, homelessness in past 12 months?

The ICD-10-CM code for housing instability, housed, homelessness in past 12 months is Z59.812 (sometimes written as Z59812). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does Z59.812 group to?

On inpatient claims, housing instability, housed, homelessness in past 12 months maps to MS-DRG 951 (other Factors Influencing Health Status), which carries a relative weight of 0.5574. Higher weights mean higher Medicare reimbursement.

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. The code appears in the Persons with potential health hazards related to socioeconomic and psychosocial circumstances (Z55-Z65) range of the CMS exempt list.