2026 ICD-10-CM Diagnosis Code T86.8401Corneal transplant rejection, right eye

ICD-10-CM Codes›S00–T88›T80-T88›T86

ICD-10-CM T86.8401
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T86.8401 is a billable ICD-10-CM diagnosis code for corneal transplant rejection, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 124 through 125. Coders also document this condition as corneal graft rejection. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of transplanted organs or tissue, initial encounter.

Code Identity

ICD-10-CM Code
T86.8401
Billable Status
Yes — Valid for Submission
Code Describes
Corneal transplant rejection, right eye
Short Description
Corneal transplant rejection, right eye
Same as the full description in the CMS dataset.
Parent Code
T86.840
Corneal transplant rejection

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT86Complications of transplanted organs and tissue
This CodeT86.8401Corneal transplant rejection, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Corneal graft rejection
  • Transplant rejection of cornea of right eye

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of transplanted organs and tissue (T86). 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 INJ036
Complication of transplanted organs or tissue, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Corneal Disorders

Your cornea is the outermost layer of your eye. It is clear and shaped like a dome. The cornea helps to shield the rest of the eye from germs, dust, and other harmful matter. It also helps your eye to focus. If you wear contact lenses, they float on top of your corneas.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement T86.8401 replaces the following previously assigned code(s):

  • T86.840 - Corneal transplant rejection
FY 2021AddedAdded to the ICD-10-CM code setEffective October 1, 2020.
FY 2022–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T86.8401Overview

Is T86.8401 (Corneal transplant rejection) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report corneal transplant rejection, right eye on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does T86.8401 group to?

When corneal transplant rejection, right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 124, 125, with relative weights from 0.7678 to 1.3231 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.