F11.9 vs Z79.891
F11.9 (Opioid use, unspecified) compared with Z79.891 (Long term (current) use of opiate analgesic), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2).
Can these codes be reported together?
Yes, when both are documented. Z79.891 carries an Excludes2 note covering F11.9: “methadone use NOS (F11.9-)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Yes, when both are documented. Z79.891 carries an Excludes2 note covering F11.9: “drug abuse and dependence (F11-F19)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
Side by side
| F11.9Opioid use, unspecified | Z79.891Long term (current) use of opiate analgesic | |
|---|---|---|
| Billing status | Non-billable header | Billable |
| Classification | F01-F99 — Mental, Behavioral and Neurodevelopmental Disorders (F01-F99) | Z00-Z99 — Factors Influencing Health Status and Contact with Health Services (Z00-Z99) |
| Definition | Opioid use, unspecified is a non-billable ICD-10-CM category code (F11.9). | Long term (current) use of opiate analgesic is a billable ICD-10-CM diagnosis code (Z79.891). |
| Includes | — | long term (current) drug use for prophylactic purposes Long term (current) use of methadone for pain management |
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources