2026 ICD-10-CM Diagnosis Code S26.10XAUnspecified injury of heart without hemopericardium, initial encounter
ICD-10-CM Codes›S00–T88›S20-S29›S26
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character A — Initial Encounter
- Not Chronic
S26.10XA is a billable ICD-10-CM diagnosis code for unspecified injury of heart without hemopericardium, 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 314 through 316, 963 through 965. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. Coders also document this condition as injury of heart without hemopericardium. 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.
- Injury of heart without hemopericardium
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Injury of heart (S26). 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.
Patient EducationClinical
Chest Injuries and Disorders
The chest is the part of your body between your neck and your abdomen (belly). The medical term for your chest is thorax.
The full article covers:
- What is the chest?
- What are chest injuries and disorders?
- How are chest injuries and disorders diagnosed?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert S26.10XA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About S26.10XAOverview
What is the ICD-10 code for unspecified injury of heart without hemopericardium, initial encounter?
The ICD-10-CM code for unspecified injury of heart without hemopericardium, initial encounter is S26.10XA (sometimes written as S2610XA). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is S26.10XA (Unspecified injury of heart without hemopericardium) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified injury of heart without hemopericardium, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S26.10XA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified injury of heart without hemopericardium, such as an emergency visit or first evaluation.
What MS-DRG does S26.10XA group to?
When unspecified injury of heart without hemopericardium, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, 963, 964, 965, with relative weights from 0.6821 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.
Is S26.10XA a CC or MCC?
CMS lists S26.10XA as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.
