2026 ICD-10-CM Diagnosis Code S27.1XXATraumatic hemothorax, initial encounter
S27.1XXA is a billable ICD-10-CM diagnosis code for traumatic hemothorax, initial encounter. The 7th character A marks it as an initial encounter code, used while the patient is receiving active treatment. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 199 through 201, 963 through 965. Coders also document this condition as hemothorax. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Internal organ injury, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Hemothorax
- Traumatic hemothorax
- Traumatic hemothorax with open wound into thorax
- Traumatic hemothorax without open wound into thorax
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of other and unspecified intrathoracic organs (S27). Use the following options for the applicable episode of care:
- A - initial encounter
- D - subsequent encounter
- S - sequela
Source: ICD-10-CM Official Guidelines for Coding and Reporting, FY 2026, published by CMS and the National Center for Health Statistics.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Hemothorax
hemorrhage within the pleural cavity.
Patient EducationClinical
Pleural Disorders
Your pleura is a large, thin sheet of tissue that wraps around the outside of your lungs and lines the inside of your chest cavity. Between the layers of the pleura is a very thin space. Normally it's filled with a small amount of fluid.
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Convert S27.1XXA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S27.1XXAOverview
Is S27.1XXA (Traumatic hemothorax) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report traumatic hemothorax, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S27.1XXA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for traumatic hemothorax, such as an emergency visit or first evaluation.
What MS-DRG does S27.1XXA group to?
When traumatic hemothorax, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 199, 200, 201, 963, 964, 965, with relative weights from 0.7151 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of S27.1XXA?
Under the General Equivalence Mappings, traumatic hemothorax, initial encounter converts to ICD-9-CM 860.2 (traum hemothorax-closed). 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.
