2026 ICD-10-CM Diagnosis Code T82.856AStenosis of peripheral vascular stent, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T82

ICD-10-CM T82.856A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T82.856A is a billable ICD-10-CM diagnosis code for stenosis of peripheral vascular 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. 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 213 closely related codes. Coders also document this condition as restenosis of peripheral vascular stent. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of cardiovascular device, implant or graft, initial encounter.

T82.856A no longer risk-adjusts for Medicare Advantage: it mapped to HCC 176 under the retired CMS-HCC V24 model through payment year 2025 but maps to no category in the live V28 model. It still risk-adjusts in the PACE (CMS-HCC V22) category 176, ESRD (V21) category 176, and ESRD (V24) category 176 for payment year 2026.

Code Identity

ICD-10-CM Code
T82.856A
Billable Status
Yes — Valid for Submission
Code Describes
Stenosis of peripheral vascular stent, initial encounter
Short Description
Stenosis of peripheral vascular stent, initial encounter
Same as the full description in the CMS dataset.
Parent Code
T82.856
Stenosis of peripheral vascular 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 CodeT82.856AStenosis of peripheral vascular stent, initial encounter

Medicare Risk Adjustment (HCC)Billing

T82.856A no longer risk-adjusts for Medicare Advantage: it maps to no payment category in the live CMS-HCC V28 model, although it still risk-adjusts in the other CMS models shown below.

CMS-HCC V28 (Medicare Advantage Payment Model)
Not mapped
Dropped in V28 see all codes that no longer risk-adjust
Prior Model (CMS-HCC V24)
HCC 176
V24 retired last contributed to a Medicare Advantage risk score in payment year 2025
Other CMS Models
PACE (CMS-HCC V22): HCC 176 · ESRD (V21): HCC 176 · ESRD (V24): HCC 176
ESRD V21 weights: 0.000 dialysis, 0.599 functioning graft · ESRD V24 weights: 0.000 dialysis, 0.586–1.017 functioning graft
Part D (RxHCC)
Not mapped
T82.856A does not risk-adjust in the RxHCC prescription drug model

Source: CMS Payment Year 2026 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Restenosis of peripheral vascular 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 T82.856A to ICD-9-CMHistory

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

ICD-9-CM
996.74 Comp-oth vasc dev/graft
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement T82.856A replaces the following previously assigned code(s):

  • T82.858A - Stenosis of other vascular prosth dev/grft, init
  • T82.858A - Stenosis of vascular prosth dev/grft, init
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T82.856AOverview

What is the ICD-10 code for stenosis of peripheral vascular stent, initial encounter?

The ICD-10-CM code for stenosis of peripheral vascular stent, initial encounter is T82.856A (sometimes written as T82856A). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is T82.856A (Stenosis of peripheral vascular stent) a billable code?

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

What does the 7th character A in T82.856A mean?

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

What MS-DRG does T82.856A group to?

When stenosis of peripheral vascular 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.

Is T82.856A a CC or MCC?

CMS lists T82.856A 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 213 closely related codes in its exclusion list.

Does T82.856A risk-adjust for Medicare Advantage payment?

Not for Medicare Advantage. T82.856A mapped to HCC 176 in the retired CMS-HCC V24 model, which last determined payment in 2025, but it maps to no category in the live V28 model; see all codes that no longer risk-adjust. It still risk-adjusts in the PACE (CMS-HCC V22) category 176 (Complications of Specified Implanted Device or Graft), ESRD (V21) category 176 (Complications of Specified Implanted Device or Graft), and ESRD (V24) category 176 (Complications of Specified Implanted Device or Graft).