2026 ICD-10-CM Diagnosis Code T84.623AInfection and inflammatory reaction due to internal fixation device of left tibia, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T84

ICD-10-CM T84.623A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T84.623A is a billable ICD-10-CM diagnosis code for infection and inflammatory reaction due to internal fixation device of left tibia, 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 485 through 487, 559 through 561. Coders also document this condition as infection of tibia associated with internal fixation device. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of internal orthopedic device or implant, initial encounter.

Code Identity

ICD-10-CM Code
T84.623A
Billable Status
Yes — Valid for Submission
Code Describes
Infection and inflammatory reaction due to internal fixation device of left tibia, initial encounter
Short Description
Infect/inflm reaction due to int fix of left tibia, init
Parent Code
T84.623
Infection and inflammatory reaction due to internal fixation device of left tibia

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT84Complications of internal orthopedic prosthetic devices, implants and grafts
This CodeT84.623AInfection and inflammatory reaction due to internal fixation device of left tibia, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Infection of tibia associated with internal fixation device
  • Left tibia infection associated with internal fixation device

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of internal orthopedic prosthetic devices, implants and grafts (T84). 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 INJ035
Complication of internal orthopedic device or implant, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

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Convert T84.623A to ICD-9-CMHistory

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

ICD-9-CM
996.67 React-oth int ortho dev
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T84.623AOverview

Is T84.623A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report infection and inflammatory reaction due to internal fixation device of left tibia, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T84.623A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for infection and inflammatory reaction due to internal fixation device of left tibia, such as an emergency visit or first evaluation.

What MS-DRG does T84.623A group to?

When infection and inflammatory reaction due to internal fixation device of left tibia, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 485, 486, 487, 559, 560, 561, with relative weights from 0.8039 to 3.2271 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of T84.623A?

Under the General Equivalence Mappings, infection and inflammatory reaction due to internal fixation device of left tibia, initial encounter converts to ICD-9-CM 996.67 (react-oth int ortho dev). The mapping is approximate, so confirm the match fits the documentation.