2026 ICD-10-CM Diagnosis Code J20.0Acute bronchitis due to Mycoplasma pneumoniae

ICD-10-CM Codes›J00–J99›J20-J22›J20

ICD-10-CM J20.0
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

J20.0 is a billable ICD-10-CM diagnosis code for acute bronchitis due to Mycoplasma pneumoniae. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 202 through 203. Coders also document this condition as acute bacterial bronchitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Acute bronchitis and Bacterial infections.

This medical diagnosis code is frequently used in Family Practice, Internal Medicine, and Pediatrics medical specialties to designate conditions such acute respiratory infections.

Code Identity

ICD-10-CM Code
J20.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute bronchitis due to Mycoplasma pneumoniae
Short Description
Acute bronchitis due to Mycoplasma pneumoniae
Same as the full description in the CMS dataset.
Parent Code
J20
Acute bronchitis

Code Classification

ChapterJ00–J99Diseases of the respiratory system
SectionJ20-J22Other acute lower respiratory infections
CategoryJ20Acute bronchitis
This CodeJ20.0Acute bronchitis due to Mycoplasma pneumoniae

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute bacterial bronchitis
  • Acute mycoplasmal bronchitis
  • Mycoplasmal tracheobronchitis

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Bronchitis(diffuse) (fibrinous) (hypostatic) (infective) (membranous)
      • acute or subacute (with bronchospasm or obstruction)
        • due to
          • Mycoplasma pneumoniae

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR RSP005
Acute bronchitis
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF003
Bacterial infections
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Acute Bronchitis

    acute inflammation and edema of the larger bronchi caused by viruses or bacteria. signs and symptoms include cough, sputum production, shortness of breath, and wheezing.

Patient EducationClinical

Acute Bronchitis

Bronchitis is an inflammation of the bronchial tubes, the airways that carry air to your lungs. It causes a cough that often brings up mucus. It can also cause shortness of breath, wheezing, a low fever, and chest tightness. There are two main types of bronchitis: acute and chronic.

Read the full article at MedlinePlus

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

Convert J20.0 to ICD-9-CMHistory

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

ICD-9-CM
466.0 Acute bronchitis
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.
ICD-9-CM
041.81 Mycoplasma
ApproximateCombination The match is approximate, and more than one code can be needed to describe the source diagnosis. Confirm with contextual judgment.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About J20.0Overview

Is J20.0 (Acute bronchitis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute bronchitis due to Mycoplasma pneumoniae on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does J20.0 group to?

When acute bronchitis due to Mycoplasma pneumoniae is the principal diagnosis on an inpatient stay, it groups to MS-DRG 202, 203, with relative weights from 0.6700 to 0.9712 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of J20.0?

Under the General Equivalence Mappings, acute bronchitis due to Mycoplasma pneumoniae converts to ICD-9-CM 466.0 (acute bronchitis) and 041.81 (mycoplasma). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.