Z79.85 — Long-term (current) use of injectable non-insulin antidiabetic drugs

Billable

Is Z79.85 billable?

Yes — Z79.85 is billable for FY2027. Z79.85 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. Z79.85 may be submitted for encounters from October 1, 2026 through September 30, 2027.

Z79.85 at a glance

Code	Z79.85
Description	Long-term (current) use of injectable non-insulin antidiabetic drugs
Billable	Yes
Code set	ICD-10-CM FY2027
Valid for encounters	October 1, 2026 – September 30, 2027

What Medicare edits apply to Z79.85?

The Medicare Code Editor screens inpatient claims before they are grouped. These edits name Z79.85 directly.

Cannot be a principal diagnosis — MCE edit 9

CMS will reject this code as the principal diagnosis on an inpatient claim. It describes something other than the condition chiefly responsible for the admission.

Which MS-DRGs does Z79.85 group to?

Z79.85 sits in MDC 23 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

949Aftercare with CC/MCCmedical
950Aftercare without CC/MCCmedical

How is Z79.85 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to Z79.85. They show the wording a clinician may have documented, which often differs from the Tabular description.

Long-term › antidiabetic drugs, injectable, non-insulin (current) (prophylactic) drug therapy (use of)
Long-term › non-insulin antidiabetic drug, injectable (current) (prophylactic) drug therapy (use of)

Excludes2 — not included here

The conditions below are not part of Z79.85, but a patient may have both at the same time. When documentation supports it, Z79.85 and the excluded code may both be reported.

long term (current) use of insulin (Z79.4)
long term (current) use of oral hypoglycemic drugs (Z79.84)

Excludes2 — not included here — inherited from Z79

The conditions below are not part of Z79.85, but a patient may have both at the same time. When documentation supports it, Z79.85 and the excluded code may both be reported.

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

Code also — inherited from Z77-Z99

Two codes may be needed to describe the condition fully. Whether Z79.85 is sequenced first depends on the reason for the encounter.

any follow-up examination (Z08-Z09)

Code also — inherited from Z79