2027 ICD-10-CM Diagnosis Code J09.X1Influenza due to identified novel influenza A virus with pneumonia

ICD-10-CM Codes›J00–J99›J09-J18›J09

ICD-10-CM J09.X1
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

J09.X1 is a billable ICD-10-CM diagnosis code for influenza due to identified novel influenza A virus with pneumonia. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 193 through 195, 791, 793, 974 through 976. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 129 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Influenza and Pneumonia (except that caused by tuberculosis).

Code Identity

ICD-10-CM Code
J09.X1
Billable Status
Yes — Valid for Submission
Code Describes
Influenza due to identified novel influenza A virus with pneumonia
Short Description
Influenza due to ident novel influenza A virus w pneumonia
Parent Code
J09.X
Influenza due to identified novel influenza A virus

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ09-J18Influenza and pneumonia
CategoryJ09Influenza due to certain identified influenza viruses
This CodeJ09.X1Influenza due to identified novel influenza A virus with pneumonia

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to J09.X1: its own notes plus those printed at J09, block J09-J18, and Chapter 10. A note printed at a category, block or chapter applies to every code under it.

Excludes1

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

From J09 Influenza due to certain identified influenza viruses applies to 4 codes
  • influenza A/H1N1 (J10.-)
  • influenza due to other identified influenza virus (J10.-)
  • influenza due to unidentified influenza virus (J11.-)
  • seasonal influenza due to other identified influenza virus (J10.-)
  • seasonal influenza due to unidentified influenza virus (J11.-)

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)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

  • if applicable, associated:
  • lung abscess (J85.1)
  • other specified type of pneumonia

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 J09.X1, its category, or a range that includes it.

Applicable To 1

These notes mention J09.X1.

  • P00.2 Newborn affected by maternal infectious and parasitic diseases
    Newborn affected by maternal infectious disease classifiable to A00-B99, J09 and J10 names J09, which includes this code

Excludes1 2

These codes carry an Excludes1 note naming J09.X1: they are not reported together with it, unless the two conditions are unrelated.

  • J10 Influenza due to other identified influenza virus
    influenza due to avian influenza virus (J09.X-) names J09.X-, which includes this code
  • J10 Influenza due to other identified influenza virus
    influenza due to swine flu (J09.X-) names J09.X-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming J09.X1: its condition is not part of those codes, and both may be reported when the patient has both.

  • Block P35-P39 Infections specific to the perinatal period
    infectious diseases not specific to the perinatal period (A00-B99, J09, J10.-) names J09, which includes this code

Code First 6

These codes say to code first a condition named in the note, and J09.X1 is one of the conditions named.

  • J12 Viral pneumonia, not elsewhere classified
    associated influenza, if applicable (J09.X1, J10.0-, J11.0-)
  • J13 Pneumonia due to Streptococcus pneumoniae
    if applicable, associated influenza (J09.X1, J10.0-, J11.0-)
  • J14 Pneumonia due to Hemophilus influenzae
    if applicable, associated influenza (J09.X1, J10.0-, J11.0-)
  • J15 Bacterial pneumonia, not elsewhere classified
    if applicable, associated influenza (J09.X1, J10.0-, J11.0-)
  • J16 Pneumonia due to other infectious organisms, not elsewhere classified
    if applicable, associated influenza (J09.X1, J10.0-, J11.0-)
  • J18 Pneumonia, unspecified organism
    if applicable, associated influenza (J09.X1, J10.0-, J11.0-)

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 RSP002
Pneumonia (except that caused by tuberculosis)
Default principal diagnosis: inpatient No · outpatient No

Patient EducationClinical

Flu

The flu, also called influenza, is a respiratory infection caused by viruses. Each year, millions of Americans get sick with the flu. Sometimes it causes mild illness. But it can also be serious or even deadly, especially for people over 65, newborn babies, and people with certain chronic illnesses.

The full article covers:

  • What is the flu?
  • What causes the flu?
  • What are the symptoms of the flu?
  • What other problems can the flu cause?
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Read the full article at MedlinePlus

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

Convert J09.X1 to ICD-9-CMHistory

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

ICD-9-CM
488.01 Flu dt iden avian w pneu
Approximate The match is approximate rather than exact.
ICD-9-CM
488.81 Flu dt nvl A vrs w pneu
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 J09.X1Overview

What is the ICD-10 code for influenza due to identified novel influenza A virus with pneumonia?

The ICD-10-CM code for influenza due to identified novel influenza A virus with pneumonia is J09.X1 (sometimes written as J09X1). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is J09.X1 (Influenza due to identified novel influenza A virus) a billable code?

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

What MS-DRG does J09.X1 group to?

When influenza due to identified novel influenza A virus with pneumonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 195, 793, 791, 193, 194, 974, 976, 975, with relative weights from 0.6062 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is J09.X1 a CC or MCC?

CMS lists J09.X1 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 129 closely related codes in its exclusion list.

Can J09.X1 be reported with a code from J10?

Not as a rule. The Excludes1 note at J09, which applies to J09.X1, lists "influenza A/H1N1 (J10.-)". 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).