Is F11.91 a billable ICD-10-CM code?

Yes. F11.91 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does F11.91 sit in the tabular list?

Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Mental and behavioral disorders due to psychoactive substance use (F10-F19).

What cannot be coded together with F11.91?

F11.91 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above F11.91 (F11.9) and apply to it just the same.

F11.91

F11.91 — Opioid use, unspecified, in remission

Billable / specific codeICD-10-CM

F11.91 is a billable, specific ICD-10-CM code for opioid use, unspecified, in remission. It is valid for submission on a claim.

Excludes1 inherited from the categories above F11.91

These are not written on F11.91, but they bind it: a note on a category applies to every code beneath it. Billing F11.91 with anything listed here is a denial.

Written on F11.9 — Opioid use, unspecified

opioid abuse (F11.1-)
opioid dependence (F11.2-)

Risk adjustment

F11.91 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

F11.91 is named in 12 Medicare coverage policies — 10 listing it as supporting medical necessity, and 2 listing it as NOT covered. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52434Health and Behavior Assessment/Intervention – Medical Policy Articlenot covered
A56562Billing and Coding: Health and Behavior Assessment/Interventionnot covered
A56614Billing and Coding: Psychiatric Inpatient Hospitalization
A56756Billing and Coding: Home Health - Psychiatric Care

How F11.91 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 F11.91.

Use›opioid›in remission

Code history

F11.91 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.

Related codes at this level

Codes that share F11.9. If F11.91 is not quite right, the correct code is usually one of these.

Questions about F11.91

Is F11.91 a billable ICD-10-CM code?: Yes. F11.91 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does F11.91 sit in the tabular list?: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Mental and behavioral disorders due to psychoactive substance use (F10-F19).
What cannot be coded together with F11.91?: F11.91 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above F11.91 (F11.9) and apply to it just the same.