2026 ICD-10-CM Diagnosis Code T83.421ADisplacement of implanted testicular prosthesis, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T83

ICD-10-CM T83.421A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T83.421A is a billable ICD-10-CM diagnosis code for displacement of implanted testicular prosthesis, 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 698 through 700. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of genitourinary device, implant or graft, initial encounter.

Code Identity

ICD-10-CM Code
T83.421A
Billable Status
Yes — Valid for Submission
Code Describes
Displacement of implanted testicular prosthesis, initial encounter
Short Description
Displacement of implanted testicular prosthesis, init
Parent Code
T83.421
Displacement of implanted testicular prosthesis

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT83Complications of genitourinary prosthetic devices, implants and grafts
This CodeT83.421ADisplacement of implanted testicular prosthesis, initial encounter

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of genitourinary prosthetic devices, implants and grafts (T83). 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 INJ034
Complication of genitourinary device, implant or graft, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Convert T83.421A to ICD-9-CMHistory

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

ICD-9-CM
996.39 Malfunc gu dev/graft NEC
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement T83.421A replaces the following previously assigned code(s):

  • T83.428A - Displacement of prosth dev/implnt/grft of genitl trct, init
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 T83.421AOverview

Is T83.421A (Displacement of implanted testicular prosthesis) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report displacement of implanted testicular prosthesis, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T83.421A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for displacement of implanted testicular prosthesis, such as an emergency visit or first evaluation.

What MS-DRG does T83.421A group to?

When displacement of implanted testicular prosthesis, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 698, 699, 700, with relative weights from 0.6899 to 1.6544 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T83.421A?

Under the General Equivalence Mappings, displacement of implanted testicular prosthesis, initial encounter converts to ICD-9-CM 996.39 (malfunc gu dev/graft NEC). The mapping is approximate, so confirm the match fits the documentation.