Z79.4 Long term (current) use of insulin

Billable ICD-10-CM code, FY2026. Exempt from present-on-admission (POA) reporting.

Excludes2 (not included here)

• 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)

Applies from Z79 Long term (current) drug therapy

Includes

• long term (current) drug use for prophylactic purposes

Excludes2 (not included here)

• drug abuse and dependence (F11-F19)
• drug use complicating pregnancy, childbirth, and the puerperium (O99.32-)

Code also

• any therapeutic drug level monitoring (Z51.81)

Risk adjustment (HCC)

• CMS-HCC V28: HCC 38 — Diabetes with Glycemic, Unspecified, or No Complications
• CMS-HCC V22: HCC 19 — Diabetes without Complication
• RxHCC V08: HCC 31 — Diabetes without Complication
• ESRD V24: HCC 19

MS-DRG index

Defines the logic of DRG(s) 949-950 in MDC 23.

Approximate ICD-9-CM (GEMs)

• V58.67 Long-term (current) use of insulin

Code annotations containing back-references to Z79.4

Back-references to Z79.4

• Use Additional: E08 Diabetes mellitus due to underlying condition ("insulin (Z79.4)")
• Use Additional: E09 Drug or chemical induced diabetes mellitus ("insulin (Z79.4)")
• Use Additional: E11 Type 2 diabetes mellitus ("insulin (Z79.4)")
• Use Additional: E13 Other specified diabetes mellitus ("insulin (Z79.4)")
• Use Additional: E89.1 Postprocedural hypoinsulinemia ("insulin use (Z79.4)")
• Use Additional: O24.1 Pre-existing type 2 diabetes mellitus, in pregnancy, childbirth and the puerperium ("long-term (current) use of insulin (Z79.4)")
• Use Additional: O24.3 Unspecified pre-existing diabetes mellitus in pregnancy, childbirth and the puerperium ("long-term (current) use of insulin (Z79.4)")
• Use Additional: O24.8 Other pre-existing diabetes mellitus in pregnancy, childbirth, and the puerperium ("long-term (current) use of insulin (Z79.4)")
• Use Additional: O24.9 Unspecified diabetes mellitus in pregnancy, childbirth and the puerperium ("long-term (current) use of insulin (Z79.4)")
• Type 2 Excludes: Z79.84 Long term (current) use of oral hypoglycemic drugs ("long term (current) use of insulin (Z79.4)")
• Type 2 Excludes: Z79.85 Long-term (current) use of injectable non-insulin antidiabetic drugs ("long term (current) use of insulin (Z79.4)")
• Use Additional: Z90.41 Acquired absence of pancreas ("insulin use (Z79.4)")

Back-references to Z79

• Code Also: Z51.81 Encounter for therapeutic drug level monitoring ("any long-term (current) drug therapy (Z79.-)")
• Type 2 Excludes: Z92.2 Personal history of drug therapy ("long term (current) drug therapy (Z79.-)")

Diagnosis Index entries for Z79.4

• Long-term (current) (prophylactic) drug therapy (use of) › insulin
• Therapy › drug, long-term (current) (prophylactic) › insulin

Nearby codes

• Z79.01 Long term (current) use of anticoagulants
• Z79.02 Long term (current) use of antithrombotics/antiplatelets
• Z79.1 Long term (current) use of non-steroidal anti-inflammatories (NSAID)
• Z79.2 Long term (current) use of antibiotics
• Z79.3 Long term (current) use of hormonal contraceptives
• Z79.4 Long term (current) use of insulin (this code)
• Z79.5 Long term (current) use of steroids
• Z79.51 Long term (current) use of inhaled steroids
• Z79.52 Long term (current) use of systemic steroids
• Z79.6 Long term (current) use of immunomodulators and immunosuppressants
• Z79.60 Long term (current) use of unspecified immunomodulators and immunosuppressants