2026 ICD-10-CM Diagnosis Code T82.399AOther mechanical complication of unspecified vascular grafts, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T82

ICD-10-CM T82.399A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T82.399A is a billable ICD-10-CM diagnosis code for other mechanical complication of unspecified vascular grafts, 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 complication of totally implantable venous access 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
T82.399A
Billable Status
Yes — Valid for Submission
Code Describes
Other mechanical complication of unspecified vascular grafts, initial encounter
Short Description
Mech compl of unspecified vascular grafts, initial encounter
Parent Code
T82.399
Other mechanical complication of unspecified vascular grafts

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 CodeT82.399AOther mechanical complication of unspecified vascular grafts, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Complication of totally implantable venous access device
  • Obstruction of totally implantable venous access device
  • Persistent flow of blood into aneurysm sac following endovascular insertion of stent graft
  • Vascular graft occlusion

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 T82.399A to ICD-9-CMHistory

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

ICD-9-CM
996.1 Malfunc vasc device/graf
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 T82.399AOverview

Is T82.399A (Other mechanical complication of unspecified vascular grafts) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other mechanical complication of unspecified vascular grafts, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T82.399A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for other mechanical complication of unspecified vascular grafts, such as an emergency visit or first evaluation.

What MS-DRG does T82.399A group to?

When other mechanical complication of unspecified vascular grafts, 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 T82.399A?

Under the General Equivalence Mappings, other mechanical complication of unspecified vascular grafts, initial encounter converts to ICD-9-CM 996.1 (malfunc vasc device/graf). The mapping is approximate, so confirm the match fits the documentation.