2026 ICD-10-CM Diagnosis Code T81.329ADeep disruption or dehiscence of operation wound, unspecified, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T81

ICD-10-CM T81.329A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T81.329A is a billable ICD-10-CM diagnosis code for deep disruption or dehiscence of operation wound, unspecified, 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 919 through 921. Coders also document this condition as dehiscence of fascia. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of other surgical or medical care, injury, initial encounter.

Code Identity

ICD-10-CM Code
T81.329A
Billable Status
Yes — Valid for Submission
Code Describes
Deep disruption or dehiscence of operation wound, unspecified, initial encounter
Short Description
Deep Disrupt/dehisc of operation wound, unspecified, init
Parent Code
T81.329
Deep disruption or dehiscence of operation wound, unspecified

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionT80-T88Complications of surgical and medical care, not elsewhere classified
CategoryT81Complications of procedures, not elsewhere classified
This CodeT81.329ADeep disruption or dehiscence of operation wound, unspecified, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dehiscence of fascia
  • Dehiscence of nerve repair
  • Dehiscence of tendon repair
  • Disorder of nerve repair
  • Disorder of tendon repair

Coding GuidelinesGuidance

The appropriate 7th character is to be added to each code from block Complications of procedures, not elsewhere classified (T81). 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 INJ037
Complication of other surgical or medical care, injury, initial encounter
Default principal diagnosis: inpatient Yes · outpatient Yes

Code History & ChangesHistory

Replacement T81.329A replaces the following previously assigned code(s):

  • T81.32XA - Disruption of internal operation (surgical) wound, NEC, init
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About T81.329AOverview

Is T81.329A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report deep disruption or dehiscence of operation wound, unspecified, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T81.329A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for deep disruption or dehiscence of operation wound, unspecified, such as an emergency visit or first evaluation.

What MS-DRG does T81.329A group to?

When deep disruption or dehiscence of operation wound, unspecified, initial encounter 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] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.