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ICD-10-CM 2027 diagnosis code

Z91.83Wandering in diseases classified elsewhere

✓ Billable / specificPOA exemptManifestation — not principal

Z91.83 is a valid, billable ICD-10-CM code for wandering in diseases classified elsewhere. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About Z91.83

Z91.83 is the ICD-10-CM diagnosis code for Wandering in diseases classified elsewhere. It belongs to category Z91 (personal risk factors, not elsewhere classified), block Z77-Z99 (persons with potential health hazards related to family and personal history and certain conditions influencing health status) 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 Z91.8 (other specified personal risk factors, not elsewhere classified), Z91.83 is specifically for Wandering in diseases classified elsewhere. Related codes cover history of falling (Z91.81), personal history of military deployment (Z91.82), oral health risk factors (Z91.84), personal history of military service (Z91.85) and other specified personal risk factors, not elsewhere classified (Z91.89).

Code first underlying disorder such as: Alzheimer's disease (G30.-), autism or pervasive developmental disorder (F84.-), intellectual disabilities (F70-F79) and unspecified dementia with behavioral disturbance (F03.9-, F03.A-, F03.B-, F03.C-).

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 a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

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

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as V40.31 (Wandering in diseases classified elsewhere).

Coding notes

Code firstSequence the underlying condition first
  • underlying disorder such as:
  • Alzheimer's disease (G30.-)
  • autism or pervasive developmental disorder (F84.-)
  • intellectual disabilities (F70-F79)
  • unspecified dementia with behavioral disturbance (F03.9-, F03.A-, F03.B-, F03.C-)

Notes that apply from higher levels

Instructions written at a parent level also apply to Z91.83.

› From Z91 Personal risk factors, not elsewhere classified
Excludes2
  • contact with and (suspected) exposures hazardous to health (Z77.-)
  • exposure to pollution and other problems related to physical environment (Z77.1-)
  • female genital mutilation status (N90.81-)
  • occupational exposure to risk factors (Z57.-)
  • personal history of physical injury and trauma (Z87.81, Z87.82-)

Broader instructions also apply from Z77-Z99 Persons with potential health hazards related to family and personal history and certain conditions influencing health status and Chapter 21: Factors influencing health status and contact with health services.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to Z91.83.

Codes whose notes reference Z91.83

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 23 · Factors Influencing Health Status and Other Contacts with Health Services

ICD-9-CM equivalent

Converter →
  • V40.31Wandering in diseases classified elsewhereexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about Z91.83

Is Z91.83 billable?

Yes. Z91.83 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can Z91.83 be used as a principal diagnosis?

No. It is a manifestation code, so it describes the effect of an underlying disease and can't be the principal diagnosis. Code the underlying condition first.

Is Z91.83 a CC or MCC?

No. Z91.83 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does Z91.83 group to?

Z91.83 is used in the MS-DRG v44.0 logic for MS-DRG 951 (Other Factors Influencing Health Status). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for Z91.83?

The CMS General Equivalence Mappings map Z91.83 to ICD-9-CM V40.31.