Z79.4

ICD-10Billable

Long term (current) use of insulin

Official ICD-10-CM descriptor (FY2026)

Long term (current) use of insulin

Z79.4 is valid for submission on a claim — CMS flags it as a billable, specific code.

Plain-language explanation

A status code recording that the patient is on long-term insulin. Z-codes describe a circumstance rather than an illness, so this one is reported alongside a diagnosis code, never instead of one.

Written by Krasyn as a general orientation to the code. It is not from CMS and is not clinical or coding advice.

Excludes2

Not included here. The condition is not part of this code, but a patient may have both, and both codes may be reported together.

  • long-term (current) use of injectable non-insulin antidiabetic drugs (Z79.85)
  • long term (current) use of oral antidiabetic drugs (Z79.84)
  • long term (current) use of oral hypoglycemic drugs (Z79.84)

Related codes in Z79

Where this code sits

Parent code
Z79

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Source

ICD-10-CM FY2026. Centers for Medicare & Medicaid Services (CMS) / National Center for Health Statistics (NCHS), “2026 ICD-10-CM Code Descriptions in Tabular Order” (icd10cm_order_2026.txt). Download the original file from cms.gov. Public domain (US Government work). Descriptors, billable flags and instructional notes on this page are reproduced from that file without modification. Krasyn adds no clinical guidance.

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