2026 ICD-10-CM Diagnosis Code J10.00Influenza due to other identified influenza virus with unspecified type of pneumonia
ICD-10-CM Codes›J00–J99›J09-J18›J10
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Not Chronic
J10.00 is a billable ICD-10-CM diagnosis code for influenza due to other identified influenza virus with unspecified type of pneumonia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 177 through 179, 193 through 195. 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. Coders also document this condition as influenza caused by Influenza A virus subtype H1N1. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Influenza and Pneumonia (except that caused by tuberculosis).
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Influenza caused by Influenza A virus subtype H1N1
- Pneumonia and influenza
- Pneumonia caused by Influenza A virus
- Pneumonia caused by Influenza A virus subtype H1N1
- Pneumonia caused by influenza virus
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.
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?
- How is the flu diagnosed?
- What are the treatments for the flu?
- Can the flu be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J10.00 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J10.00Overview
Is J10.00 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report influenza due to other identified influenza virus with unspecified type of pneumonia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does J10.00 group to?
When influenza due to other identified influenza virus with unspecified type of pneumonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 177, 178, 179, 193, 194, 195, with relative weights from 0.6285 to 1.5627 depending on complications. Higher weights mean higher Medicare reimbursement.
Is J10.00 a CC or MCC?
CMS lists J10.00 as an MCC (major complication or comorbidity) for FY 2026. 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.
What is the ICD-9 equivalent of J10.00?
Under the General Equivalence Mappings, influenza due to other identified influenza virus with unspecified type of pneumonia converts to ICD-9-CM 487.0 (influenza with pneumonia). The mapping is approximate, so confirm the match fits the documentation.
