Influenza due to certain identified influenza viruses
In Influenza and pneumonia (J09-J18), chapter 10: Diseases of the Respiratory System
4 billable codes under J09: 1 is an MCC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.
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Instructional notes
Excludes1: not coded here, use a different code
Also applies, from Influenza and pneumonia (J09-J18)
These notes sit on J09-J18 and apply to every code under it, including J09.
Excludes2: not included here, code separately if applicable
Use additional code: add a second code for this, listed after this one
- code, if applicable, to identify resistance to antimicrobial drugs (Z16.-)
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
- Section I.C.10.c Influenza due to certain identified influenza viruses (page 57), covers J09
Code J09 or J10 only for influenza the provider states is due to an identified virus; lab confirmation is not required. Code suspected, possible, or probable identified influenza to J11.
Other Chapter 10 topics:
- Chronic Obstructive Pulmonary Disease [COPD] and Asthma (page 56)
- Acute Respiratory Failure (page 56)
- Ventilator associated Pneumonia (page 57)
- Vaping-related disorders (page 58)
All codes under J09
J09 can't be used on a claim. Pick a billable code below; grey headings group them.
- J09.XInfluenza due to identified novel influenza A virus
- J09.X1Influenza due to identified novel influenza A virus with pneumonia
- J09.X2Influenza due to identified novel influenza A virus with other respiratory manifestations
- J09.X3Influenza due to identified novel influenza A virus with gastrointestinal manifestations
- J09.X9Influenza due to identified novel influenza A virus with other manifestations
J09 MS-DRGs
As the principal diagnosis, the billable codes under J09 group to these 10 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
- DRG 193 Simple Pneumonia and Pleurisy with MCC (2 of 4 codes)
- DRG 194 Simple Pneumonia and Pleurisy with CC (2 of 4 codes)
- DRG 195 Simple Pneumonia and Pleurisy without CC/MCC (2 of 4 codes)
- DRG 791 Prematurity with Major Problems (2 of 4 codes)
- DRG 793 Full Term Neonate with Major Problems (2 of 4 codes)
- DRG 865 Viral Illness with MCC (2 of 4 codes)
- DRG 866 Viral Illness without MCC (2 of 4 codes)
- DRG 974 HIV with Major Related Condition with MCC (1 of 4 codes)
- DRG 975 HIV with Major Related Condition with CC (1 of 4 codes)
- DRG 976 HIV with Major Related Condition without CC/MCC (1 of 4 codes)
Other codes that refer to J09
Notes on these codes point to J09.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
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.
Read more about flu on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.