2026 ICD-10-CM Diagnosis Code T82.221ABreakdown (mechanical) of biological heart valve graft, initial encounter
T82.221A is a billable ICD-10-CM diagnosis code for breakdown (mechanical) of biological heart valve graft, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of cardiovascular device, implant or graft, initial encounter.
Code Identity
Code Classification
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Complications of cardiac and vascular prosthetic devices, implants and grafts (T82). 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
Coronary Artery Bypass Surgery
Coronary artery bypass surgery creates a new path for blood to flow to your heart. This surgery is sometimes called a coronary artery bypass graft (CABG) or heart bypass. It's the most common heart surgery in adults. You may need this surgery if you have a blocked or partially blocked artery in your heart.
The full article covers:
- What is coronary artery bypass surgery?
- Who might benefit from coronary artery bypass surgery?
- What happens during coronary artery bypass surgery?
- Are there any risks from coronary artery bypass surgery?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert T82.221A to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T82.221AOverview
Is T82.221A (Breakdown (mechanical) of biological heart valve graft) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report breakdown (mechanical) of biological heart valve graft, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T82.221A mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for breakdown (mechanical) of biological heart valve graft, such as an emergency visit or first evaluation.
What MS-DRG does T82.221A group to?
When breakdown (mechanical) of biological heart valve graft, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, with relative weights from 0.6821 to 2.0852 depending on complications. Higher weights mean higher Medicare reimbursement.
What is the ICD-9 equivalent of T82.221A?
Under the General Equivalence Mappings, breakdown (mechanical) of biological heart valve graft, initial encounter converts to ICD-9-CM 996.09 (malfunc card dev/grf NEC). The mapping is approximate, so confirm the match fits the documentation.
