2027 ICD-10-CM Diagnosis Code Z91.83Wandering in diseases classified elsewhere
Z91.83 is a billable ICD-10-CM diagnosis code for wandering in diseases classified elsewhere. 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 a manifestation code that cannot be reported as the principal diagnosis and exempt from POA reporting. Coders also document this condition as tendency to wander. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified status.
Code Identity
Code Classification
Code EditsBilling
Medicare Code Editor checks that affect claim validity for Z91.83.
Present on Admission (POA)Billing
Z91.83 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 family and personal history and certain conditions influencing health status (Z77-Z99).
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Tendency to wander
- Wandering
- Wandering due to dementia
- Wanders at night
- Wanders during day and at night
- Wanders during the day
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Z91.83: its own notes plus those printed at Z91, block Z77-Z99, 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.
Code First
The underlying condition named in the note is sequenced before this code.
Code Also
A second code may be needed to fully describe the condition; the note gives no sequencing direction.
Notes
General instructions on how these codes are used.
- 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 Z91.83, its category, or a range that includes it.
Use Additional Code 12
These codes say to use an additional code from the note, and Z91.83 is one of the codes named.
- F01.518 Vascular dementia, unspecified severity, with other behavioral disturbancecode, if applicable, to identify wandering in vascular dementia (Z91.83)
- F01.A18 Vascular dementia, mild, with other behavioral disturbancecode, if applicable, to identify wandering in vascular dementia (Z91.83)
- F01.B18 Vascular dementia, moderate, with other behavioral disturbancecode, if applicable, to identify wandering in vascular dementia (Z91.83)
- F01.C18 Vascular dementia, severe, with other behavioral disturbancecode, if applicable, to identify wandering in vascular dementia (Z91.83)
- F02.818 Dementia in other diseases classified elsewhere, unspecified severity, with other behavioral disturbancecode, if applicable, to identify wandering in dementia in conditions classified elsewhere (Z91.83)
- F02.A18 Dementia in other diseases classified elsewhere, mild, with other behavioral disturbancecode, if applicable, to identify wandering in dementia in conditions classified elsewhere (Z91.83)
- F02.B18 Dementia in other diseases classified elsewhere, moderate, with other behavioral disturbancecode, if applicable, to identify wandering in dementia in conditions classified elsewhere (Z91.83)
- F02.C18 Dementia in other diseases classified elsewhere, severe, with other behavioral disturbancecode, if applicable, to identify wandering in dementia in conditions classified elsewhere (Z91.83)
- F03.918 Unspecified dementia, unspecified severity, with other behavioral disturbancecode, if applicable, to identify wandering in unspecified dementia (Z91.83)
- F03.A18 Unspecified dementia, mild, with other behavioral disturbancecode, if applicable, to identify wandering in unspecified dementia (Z91.83)
- F03.B18 Unspecified dementia, moderate, with other behavioral disturbancecode, if applicable, to identify wandering in unspecified dementia (Z91.83)
- F03.C18 Unspecified dementia, severe, with other behavioral disturbancecode, if applicable, to identify wandering in unspecified dementia (Z91.83)
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.
Convert Z91.83 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Z91.83Overview
What is the ICD-10 code for wandering in diseases classified elsewhere?
The ICD-10-CM code for wandering in diseases classified elsewhere is Z91.83 (sometimes written as Z9183). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Z91.83 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report wandering in diseases classified elsewhere on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Z91.83 group to?
On inpatient claims, wandering in diseases classified elsewhere 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 Z91.83 be a principal diagnosis?
No. This is a manifestation code: wandering in diseases classified elsewhere describes the manifestation of an underlying disease rather than the disease itself, so the underlying condition is sequenced first.
Is Z91.83 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 wandering in diseases classified elsewhere on inpatient claims. The code appears in the Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99) range of the CMS exempt list.
