Z79.4 — Long term (current) use of insulin
Z79.4 is a billable, specific ICD-10-CM code for long term (current) use of insulin. It is valid for submission on a claim.
Excludes2 — not included here, but may coexist
The excluded condition is not part of this code, but a patient can have both. You may code both.
Risk adjustment
Z79.4 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 38 Diabetes with No, Glycemic, or Unspecified Complications0.166 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
Z79.4 is named in 14 Medicare coverage policies — 14 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56551Billing and Coding: Visual Fields Testing
- A56674Billing and Coding: Home Health Plans of Care: Monitoring Glucose Control in the Medicare Home Health Population with Type II Diabetes Mellitus
- A56799Billing and Coding: Visual Fields Testing
- A57189Billing and Coding: Serum Magnesium
How Z79.4 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to Z79.4.
- Long-term›insulin
- Therapy›drug, long-term›insulin
Related codes at this level
Codes that share Z79. If Z79.4 is not quite right, the correct code is usually one of these.
- Z79.0Long term (current) use of anticoagulants and antithrombotics/antiplatelets
- Z79.1Long term (current) use of non-steroidal anti-inflammatories (NSAID)
- Z79.2Long term (current) use of antibiotics
- Z79.3Long term (current) use of hormonal contraceptives
- Z79.5Long term (current) use of steroids
- Z79.6Long term (current) use of immunomodulators and immunosuppressants
- Z79.8Other long term (current) drug therapy
Questions about Z79.4
- Is Z79.4 a billable ICD-10-CM code?
- Yes. Z79.4 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Z79.4 sit in the tabular list?
- Factors influencing health status and contact with health services (Z00-Z99), in the block Persons with potential health hazards related to family and personal history and certain conditions influencing health status (Z77-Z99).