2027 ICD-10-CM Diagnosis Code Z65.5Exposure to disaster, war and other hostilities

ICD-10-CM Codes›Z00–Z99›Z55-Z65›Z65

ICD-10-CM Z65.5
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

Z65.5 is a billable ICD-10-CM diagnosis code for exposure to disaster, war and other hostilities. 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Socioeconomic/psychosocial factors.

Code Identity

ICD-10-CM Code
Z65.5
Billable Status
Yes — Valid for Submission
Code Describes
Exposure to disaster, war and other hostilities
Short Description
Exposure to disaster, war and other hostilities
Same as the full description in the CMS dataset.
Parent Code
Z65
Problems related to other psychosocial circumstances

Code Classification

ChapterZ00–Z99Factors influencing health status and contact with health services
SectionZ55-Z65Persons with potential health hazards related to socioeconomic and psychosocial circumstances
CategoryZ65Problems related to other psychosocial circumstances
This CodeZ65.5Exposure to disaster, war and other hostilities

Code EditsBilling

Medicare Code Editor checks that affect claim validity for Z65.5.

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

Z65.5 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.

  • Exposure to combat
  • Operations of war
  • Prisoner of war
  • Prisoner of war in Germany
  • Prisoner of war in Japan
  • Saw war service
  • Victim of aerial warfare
  • Victim of armed conflict
  • Victim of civil insurrection
  • Victim of civil warfare
  • Victim of guerrilla warfare
  • Victim of international warfare
  • Victim of land warfare
  • Victim of military action
  • Victim of naval warfare
  • Victim of peacekeeping action

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to Z65.5: its own notes plus those printed at Chapter 21. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • target of perceived discrimination or persecution (Z60.5)

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.

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

Convert Z65.5 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
V62.22 Hx retrn military deploy
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About Z65.5Overview

What is the ICD-10 code for exposure to disaster, war and other hostilities?

The ICD-10-CM code for exposure to disaster, war and other hostilities is Z65.5 (sometimes written as Z655). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is Z65.5 (Problems related to other psychosocial circumstances) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report exposure to disaster, war and other hostilities on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does Z65.5 group to?

On inpatient claims, exposure to disaster, war and other hostilities 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 Z65.5 be a principal diagnosis?

No. The Medicare Code Editor rejects this code as a principal diagnosis because exposure to disaster, war and other hostilities describes a circumstance that influences health status rather than a current illness. Report it as a secondary diagnosis.

Is Z65.5 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 exposure to disaster, war and other hostilities 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.