2026 ICD-10-CM Diagnosis Code T86.8491Unspecified complication of corneal transplant, right eye

ICD-10-CM Codes›S00–T88›T80-T88›T86

ICD-10-CM T86.8491
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T86.8491 is a billable ICD-10-CM diagnosis code for unspecified complication of corneal transplant, right eye. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 919 through 921. Coders also document this condition as disorder due to and following transplant of cornea of right eye. 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
T86.8491
Billable Status
Yes — Valid for Submission
Code Describes
Unspecified complication of corneal transplant, right eye
Short Description
Unspecified complication of corneal transplant, right eye
Same as the full description in the CMS dataset.
Parent Code
T86.849
Unspecified complication of corneal transplant

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 CodeT86.8491Unspecified complication of corneal transplant, right eye

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Disorder due to and following transplant 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

Code History & ChangesHistory

Replacement T86.8491 replaces the following previously assigned code(s):

  • T86.849 - Unspecified complication of corneal transplant
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 T86.8491Overview

Is T86.8491 (Unspecified complication of corneal transplant) a billable code?

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

What MS-DRG does T86.8491 group to?

When unspecified complication of corneal transplant, right eye is the principal diagnosis on an inpatient stay, it groups to MS-DRG 919, 920, 921, with relative weights from 0.6884 to 1.8308 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.