Z79.4
Long term (current) use of insulin
Z79.4 (also written Z794) is a billable ICD-10-CM diagnosis code for long term (current) use of insulin. It is part of the FY2027 code set, effective October 1, 2026. It is one of the 32 codes in category Z79 (Long term (current) drug therapy). The Alphabetic Index lists it under 2 entries. Its coding notes include a Code also instruction and 5 Excludes2 entries.
Guidelines tip
From the FY2027 Official Guidelines. ICD10Ref adds no rules of its own.
Patients on insulin plus an oral or injectable non-insulin drug get both Z79 codes. Z79.4 is not assigned when insulin is given temporarily to bring blood sugar under control.
Code also
Two codes may be needed to describe the condition. This note gives no sequencing order.
Also from chapter/block level (1 note)
- any follow-up examination (Z08-Z09)
Excludes2
Not included here. Both codes may be reported if the patient has both conditions.
Includes
Further defines or gives examples of the content of the category.
- long term (current) drug use for prophylactic purposes
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. 2 entries