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ICD-10-CM 2027 diagnosis code

J09.X1Influenza due to identified novel influenza A virus with pneumonia

✓ Billable / specificMCC — major complication/comorbidity

J09.X1 is a valid, billable ICD-10-CM code for influenza due to identified novel influenza a virus with pneumonia. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Influenza due to ident novel influenza A virus w pneumonia

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About J09.X1

J09.X1 is the ICD-10-CM diagnosis code for influenza due to identified novel influenza A virus with pneumonia. It belongs to category J09 (influenza due to certain identified influenza viruses), block J09-J18 (influenza and pneumonia) and chapter 10 (diseases of the respiratory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within J09.X (influenza due to identified novel influenza A virus), J09.X1 is specifically for influenza due to identified novel influenza A virus with pneumonia. Related codes cover with other respiratory manifestations (J09.X2), with gastrointestinal manifestations (J09.X3) and with other manifestations (J09.X9).

As a secondary diagnosis it is an MCC (major complication or comorbidity), which can move an inpatient stay into the highest-paying "with MCC" MS-DRG of its family, unless the principal diagnosis excludes it.

In MS-DRG v44.0, it is part of the grouping logic for DRG 193 (Simple Pneumonia and Pleurisy with MCC, relative weight 1.2825), DRG 194 (Simple Pneumonia and Pleurisy with CC, relative weight 0.7888), DRG 195 (Simple Pneumonia and Pleurisy without CC/MCC, relative weight 0.6063), DRG 791 (Prematurity with Major Problems, relative weight 4.1075), DRG 793 (Full Term Neonate with Major Problems, relative weight 4.2195), DRG 974 (HIV with Major Related Condition with MCC, relative weight 3.0506) and 2 more, in MDC 04 (Diseases and Disorders of the Respiratory System), MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period) and MDC 25 (Human Immunodeficiency Virus Infections), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 488.01 (influenza due to identified avian influenza virus with pneumonia) and 488.81 (influenza due to identified novel influenza A virus with pneumonia).

Coding notes

Code alsoTwo codes may be needed; sequencing depends on circumstances
  • , if applicable, associated:
  • lung abscess (J85.1)
  • other specified type of pneumonia

Notes that apply from higher levels

Instructions written at a parent level also apply to J09.X1.

› From J09 Influenza due to certain identified influenza viruses
Excludes1
  • 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.-)

Broader instructions also apply from J09-J18 Influenza and pneumonia and Chapter 10: Diseases of the respiratory system.

Alphabetic index entries

1 entries

Terms in the official ICD-10-CM index that lead to J09.X1.

Codes whose notes reference J09.X1

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

MDC 15 · Newborns and Other Neonates with Conditions Originating in the Perinatal Period

ICD-9-CM equivalent

Converter →
  • 488.01Influenza due to identified avian influenza virus with pneumoniaapproximate
  • 488.81Influenza due to identified novel influenza A virus with pneumoniaapproximate

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about J09.X1

Is J09.X1 billable?

Yes. J09.X1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J09.X1 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J09.X1 as a principal diagnosis.

Is J09.X1 a CC or MCC?

J09.X1 is an MCC (major complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.

What DRG does J09.X1 group to?

J09.X1 is used in the MS-DRG v44.0 logic for MS-DRG 193 (Simple Pneumonia and Pleurisy with MCC), MS-DRG 194 (Simple Pneumonia and Pleurisy with CC), MS-DRG 195 (Simple Pneumonia and Pleurisy without CC/MCC), MS-DRG 791 (Prematurity with Major Problems), MS-DRG 793 (Full Term Neonate with Major Problems), MS-DRG 974 (HIV with Major Related Condition with MCC) and 2 more. Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for J09.X1?

The CMS General Equivalence Mappings map J09.X1 to ICD-9-CM 488.01 and 488.81.