Z58.6
Inadequate drinking-water supply
Z58.6 (also written Z586) is a billable ICD-10-CM diagnosis code for inadequate drinking-water supply. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 3 codes in category Z58 (Problems related to physical environment). The Alphabetic Index lists it under 4 entries. Its coding notes include 2 Excludes2 entries.
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
- deprivation of water (T73.1)
Care settings
How CMS programs treat this code. These are CMS claim edits and list entries, not coverage or eligibility rules.
Hospice: not accepted as primary
Not accepted as the principal diagnosis on a hospice claim (bill types 081x and 082x). The Integrated OCE returns an edit for this code.
Reason: Supplementary or additional code, not allowed as principal diagnosis.
Inclusion terms
Conditions classified to this code.
- Lack of safe drinking water
Notes
Also from chapter/block level (3 notes)
- 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.
Alphabetic Index terms
Terms the official Alphabetic Index lists for this code. 4 entries