2026 ICD-10-CM Diagnosis Code T82.855AStenosis of coronary artery stent, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T82

ICD-10-CM T82.855A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T82.855A is a billable ICD-10-CM diagnosis code for stenosis of coronary artery stent, 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 coronary stent patency - finding. 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
T82.855A
Billable Status
Yes — Valid for Submission
Code Describes
Stenosis of coronary artery stent, initial encounter
Short Description
Stenosis of coronary artery stent, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T82.855
Stenosis of coronary artery stent

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 CodeT82.855AStenosis of coronary artery stent, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Coronary stent patency - finding
  • Restenosis of coronary artery following insertion of stent into coronary artery
  • Restenosis of coronary artery stent

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 T82.855A to ICD-9-CMHistory

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

ICD-9-CM
996.72 Comp-oth cardiac device
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement T82.855A replaces the following previously assigned code(s):

  • T82.857A - Stenosis of cardiac prosth dev/grft, init
  • T82.857A - Stenosis of other cardiac prosth dev/grft, initial encounter
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T82.855AOverview

Is T82.855A (Stenosis of coronary artery stent) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report stenosis of coronary artery stent, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T82.855A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for stenosis of coronary artery stent, such as an emergency visit or first evaluation.

What MS-DRG does T82.855A group to?

When stenosis of coronary artery stent, 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 T82.855A?

Under the General Equivalence Mappings, stenosis of coronary artery stent, initial encounter converts to ICD-9-CM 996.72 (comp-oth cardiac device). The mapping is approximate, so confirm the match fits the documentation.