Cough is classified under ICD-10-CM code R05, which requires specifying the duration. Common billable codes include R05.1 (acute cough), R05.2 (subacute cough), R05.3 (chronic cough), and R05.9 (cough, unspecified).
Primary codes
Billable
Billable
Extension
—
7th character
—
POA exempt
No
Coding risks
- Sequencing as primary when this should be a secondary diagnosis
Hierarchy
Code comparison
Compare key differences between related codes to select the most specific option.
| Code | Description | Scenario |
|---|---|---|
| R05.1 | Acute cough | Cough documented as acute, present less than three weeks with clear onset noted. |
| R05.2 | Subacute cough | Subacute cough documented as persisting three to eight weeks, beyond acute but not yet chronic. |
| R05.3 | Chronic cough | Cough persisting beyond eight weeks, documented as chronic in the record. |
| R05.9 | Cough, unspecified | Cough documented without any duration or acuity specified in the chart. |
Select the most specific code supported by the encounter documentation. More specific codes improve reimbursement accuracy and reduce audit risk.
Code ranges
Cough
Category covering acute, subacute, chronic, and unspecified cough presentations not otherwise classified to a specific respiratory disease.
Symptoms and signs involving the circulatory and respiratory systems
Symptom codes for respiratory and circulatory complaints when a definitive underlying condition has not been established.
Symptoms, signs and abnormal clinical and laboratory findings, NEC
Chapter 18 codes used when signs, symptoms, or findings point to no specific confirmed diagnosis.
Bronchitis, not specified as acute or chronic
Inflammation of the bronchi presenting with cough and mucus production, not otherwise specified as acute or chronic.
Vaping-related disorder
Lung injury and respiratory symptoms attributable to use of electronic cigarette or vaping products.
Coding risks
Avoid these common coding issues when reporting Cough.
Impact
Assigning R05.9 without documented duration may miscode a chronic cough (R05.3) as unspecified, losing specificity.
Mitigation
Consider querying the provider when duration is absent rather than inferring from visit frequency or prior notes.
Related codes
Ancillary and co-coding
Codes commonly reported with the primary diagnosis on the same claim.
Differential codes
Alternative or commonly confused codes to consider when documentation suggests a different condition than the primary diagnosis.
Frequently asked questions
Use R05.9 only when duration is not documented. If acute, subacute, or chronic is specified, assign R05.1, R05.2, or R05.3 instead.
References
Compiled from the following authoritative coding references. Last updated 2026-08-04.