2026 ICD-10-CM Diagnosis Code T81.321ADisruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter

ICD-10-CM Codes›S00–T88›T80-T88›T81

ICD-10-CM T81.321A
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

T81.321A is a billable ICD-10-CM diagnosis code for disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, 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 anastomosis of pancreatic duct. 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
T81.321A
Billable Status
Yes — Valid for Submission
Code Describes
Disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter
Short Description
Disrupt/dehisc closr int op (surg) wnd abd wl msl/fasc, init
Parent Code
T81.321
Disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia

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 CodeT81.321ADisruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Dehiscence of anastomosis of pancreatic duct
  • Disorder of pancreatic duct anastomosis

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 T81.321A 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 T81.321AOverview

Is T81.321A a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in T81.321A mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, such as an emergency visit or first evaluation.

What MS-DRG does T81.321A group to?

When disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, 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.