2027 ICD-10-CM Diagnosis Code J11.82Influenza due to unidentified influenza virus with myocarditis

ICD-10-CM Codes›J00–J99›J09-J18›J11

ICD-10-CM J11.82
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

J11.82 is a billable ICD-10-CM diagnosis code for influenza due to unidentified influenza virus with myocarditis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 865 through 866. Coders also document this condition as acute myocarditis - influenzal. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Influenza and Myocarditis and cardiomyopathy.

Code Identity

ICD-10-CM Code
J11.82
Billable Status
Yes — Valid for Submission
Code Describes
Influenza due to unidentified influenza virus with myocarditis
Short Description
Influenza due to unidentified influenza virus w myocarditis
Parent Code
J11.8
Influenza due to unidentified influenza virus with other manifestations

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ09-J18Influenza and pneumonia
CategoryJ11Influenza due to unidentified influenza virus
This CodeJ11.82Influenza due to unidentified influenza virus with myocarditis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute myocarditis - influenzal
  • Myocarditis caused by influenza virus

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to J11.82: its own notes plus those printed at block J09-J18 and Chapter 10. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Influenzal myocarditis NOS

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 Block J09-J18 Influenza and pneumonia applies to 53 codes
  • allergic or eosinophilic pneumonia (J82)
  • aspiration pneumonia NOS (J69.0)
  • meconium pneumonia (P24.01)
  • neonatal aspiration pneumonia (P24.-)
  • pneumonia due to solids and liquids (J69.-)
  • congenital pneumonia (P23.9)
  • lipid pneumonia (J69.1)
  • rheumatic pneumonia (I00)
  • ventilator associated pneumonia (J95.851)
From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • smoke inhalation (T59.81-)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Block J09-J18 Influenza and pneumonia applies to 53 codes
  • code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)
From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • code, where applicable, to identify:
  • exposure to environmental tobacco smoke (Z77.22)
  • exposure to tobacco smoke in the perinatal period (P96.81)
  • history of tobacco dependence (Z87.891)
  • occupational exposure to environmental tobacco smoke (Z57.31)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

Notes

General instructions on how these codes are used.

From Chapter 10 (J00-J99) Diseases of the respiratory system applies to 366 codes
  • When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).

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

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name J11.82, its category, or a range that includes it.

Excludes1 4

These codes carry an Excludes1 note naming J11.82: they are not reported together with it, unless the two conditions are unrelated.

  • I41 Myocarditis in diseases classified elsewhere
    influenzal (J09.X9, J10.82, J11.82)
  • J09 Influenza due to certain identified influenza viruses
    influenza due to unidentified influenza virus (J11.-) names J11.-, which includes this code
  • J09 Influenza due to certain identified influenza viruses
    seasonal influenza due to unidentified influenza virus (J11.-) names J11.-, which includes this code
  • J10 Influenza due to other identified influenza virus
    influenza due to unidentifed influenza virus (J11.-) names J11.-, 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 RSP003
Influenza
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR CIR005
Myocarditis and cardiomyopathy
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Cardiomyopathy

Cardiomyopathy is the name for diseases of the heart muscle. These diseases enlarge your heart muscle or make it thicker and more rigid than normal. In rare cases, scar tissue replaces the muscle tissue.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert J11.82 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
487.8 Flu w manifestation NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About J11.82Overview

What is the ICD-10 code for influenza due to unidentified influenza virus with myocarditis?

The ICD-10-CM code for influenza due to unidentified influenza virus with myocarditis is J11.82 (sometimes written as J1182). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is J11.82 a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report influenza due to unidentified influenza virus with myocarditis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does J11.82 group to?

When influenza due to unidentified influenza virus with myocarditis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 866, 865, with relative weights from 0.8691 to 1.3153 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J11.82?

Under the General Equivalence Mappings, influenza due to unidentified influenza virus with myocarditis converts to ICD-9-CM 487.8 (flu w manifestation NEC). The mapping is approximate, so confirm the match fits the documentation.