2027 ICD-10-CM Diagnosis Code F11.91Opioid use, unspecified, in remission

ICD-10-CM Codes›F01–F99›F10-F19›F11

ICD-10-CM F11.91
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

F11.91 is a billable ICD-10-CM diagnosis code for opioid use, unspecified, in remission. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 894 through 897. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Mental and substance use disorders in remission.

Code Identity

ICD-10-CM Code
F11.91
Billable Status
Yes — Valid for Submission
Code Describes
Opioid use, unspecified, in remission
Short Description
Opioid use, unspecified, in remission
Same as the full description in the CMS dataset.
Parent Code
F11.9
Opioid use, unspecified

Code Classification

ChapterF01–F99Mental and behavioural disorders
SectionF10-F19Mental and behavioral disorders due to psychoactive substance use
CategoryF11Opioid related disorders
This CodeF11.91Opioid use, unspecified, in remission

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to F11.91: its own notes plus those printed at F11.9 and Chapter 5. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • disorders of psychological development

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From F11.9 Opioid use, unspecified applies to 15 codes

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 5 (F01-F99) Mental and behavioural disorders applies to 872 codes
  • symptoms, signs and abnormal clinical laboratory findings, not elsewhere classified (R00-R99)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name F11.91, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming F11.91: they are not reported together with it, unless the two conditions are unrelated.

  • F11.1 Opioid abuse
    opioid use, unspecified (F11.9-) names F11.9-, which includes this code
  • F11.2 Opioid dependence
    opioid use, unspecified (F11.9-) names F11.9-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming F11.91: its condition is not part of those codes, and both may be reported when the patient has both.

  • Z79.891 Long term (current) use of opiate analgesic
    methadone use NOS (F11.9-) names F11.9-, which includes this code

Use Additional Code 1

These codes say to use an additional code from the note, and F11.91 is one of the codes named.

  • K85.3 Drug induced acute pancreatitis
    code to identify drug abuse and dependence (F11.-F17.-) names F11, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MBD026
Mental and substance use disorders in remission
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Opioid-Related Disorders

    disorders related to or resulting from abuse or misuse of opioids.

Code History & ChangesHistory

Replacement F11.91 replaces the following previously assigned code(s):

  • F11.90 - Opioid use, unspecified, uncomplicated
FY 2023AddedAdded to the ICD-10-CM code setEffective October 1, 2022.
FY 2024–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About F11.91Overview

What is the ICD-10 code for opioid use, unspecified, in remission?

The ICD-10-CM code for opioid use, unspecified, in remission is F11.91 (sometimes written as F1191). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is F11.91 (Opioid use, unspecified) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report opioid use, unspecified, in remission on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does F11.91 group to?

When opioid use, unspecified, in remission is the principal diagnosis on an inpatient stay, it groups to MS-DRG 894, 897, 895, 896, with relative weights from 0.6272 to 1.6610 depending on complications. Higher weights mean higher Medicare reimbursement.

Can F11.91 be reported with a code from F11.1?

Not as a rule. The Excludes1 note at F11.9, which applies to F11.91, lists "opioid abuse (F11.1-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).