2026 ICD-10-CM Diagnosis Code T82.539ALeakage of unspecified cardiac and vascular devices and implants, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T82

ICD-10-CM T82.539A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T82.539A is a billable ICD-10-CM diagnosis code for leakage of unspecified cardiac and vascular devices and implants, 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. Coders also document this condition as leakage of cardiac device. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of cardiovascular device, implant or graft, initial encounter.

Code Identity

ICD-10-CM Code
T82.539A
Billable Status
Yes — Valid for Submission
Code Describes
Leakage of unspecified cardiac and vascular devices and implants, initial encounter
Short Description
Leakage of unsp cardiac and vasc devices and implnt, init
Parent Code
T82.539
Leakage of unspecified cardiac and vascular devices and implants

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT82Complications of cardiac and vascular prosthetic devices, implants and grafts
This CodeT82.539ALeakage of unspecified cardiac and vascular devices and implants, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Leakage of cardiac device

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.

CCSR INJ033
Complication of cardiovascular device, implant or graft, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert T82.539A to ICD-9-CMHistory

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

ICD-9-CM
996.00 Malfunc card dev/grf NOS
Approximate The match is approximate rather than exact.

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 T82.539AOverview

Is T82.539A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report leakage of unspecified cardiac and vascular devices and implants, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T82.539A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for leakage of unspecified cardiac and vascular devices and implants, such as an emergency visit or first evaluation.

What MS-DRG does T82.539A group to?

When leakage of unspecified cardiac and vascular devices and implants, 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 T82.539A?

Under the General Equivalence Mappings, leakage of unspecified cardiac and vascular devices and implants, initial encounter converts to ICD-9-CM 996.00 (malfunc card dev/grf NOS). The mapping is approximate, so confirm the match fits the documentation.