ICD-10-CM 2027 diagnosis code
T81.321ADisruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter
T81.321A is a valid, billable ICD-10-CM code for disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.Short description: Disrupt/dehisc closr int op (surg) wnd abd wl msl/fasc, init
Code last changed in FY2025 (effective October 1, 2024). Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data
About T81.321A
T81.321A is the ICD-10-CM diagnosis code for disruption or dehiscence of closure of internal operation (surgical) wound of abdominal wall muscle or fascia, initial encounter. It belongs to category T81 (complications of procedures, not elsewhere classified), block T80-T88 (complications of surgical and medical care, not elsewhere classified) and chapter 19 (injury, poisoning and certain other consequences of external causes). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.
The 7th character "A" means initial encounter: use it while the patient is receiving active treatment for the condition.
Use an additional code for adverse effect, if applicable, to identify drug (T36-T50 with fifth or sixth character 5).
As a secondary diagnosis it is a CC (complication or comorbidity), which can move an inpatient stay into the "with CC" MS-DRG of its family, unless the principal diagnosis excludes it.
In MS-DRG v44.0, it is part of the grouping logic for DRG 919 (Complications of Treatment with MCC, relative weight 1.763), DRG 920 (Complications of Treatment with CC, relative weight 0.9975) and DRG 921 (Complications of Treatment without CC/MCC, relative weight 0.6722), in MDC 21 (Injuries, Poisonings and Toxic Effects of Drugs), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
It was added in FY2025, effective October 1, 2024.
7th character
Ainitial encounter
CC/MCC status for this injury by encounter: CC for A; Neither CC nor MCC for D, S.
Other encounter types for T81.321:
Notes that apply from higher levels
Instructions written at a parent level also apply to T81.321A.
› From T81 Complications of procedures, not elsewhere classified
- complications following immunization (T88.0-T88.1)
- complications following infusion, transfusion and therapeutic injection (T80.-)
- complications of transplanted organs and tissue (T86.-)
- specified complications classified elsewhere, such as:
- complication of prosthetic devices, implants and grafts (T82-T85)
- dermatitis due to drugs and medicaments (L23.3, L24.4, L25.1, L27.0-L27.1)
- endosseous dental implant failure (M27.6-)
- floppy iris syndrome (IFIS) (intraoperative) H21.81
- intraoperative and postprocedural complications of specific body system (D78.-, E36.-, E89.-, G97.3-, G97.4, H59.3-, H59.-, H95.2-, H95.3, I97.4-, I97.5, J95, K91.-, L76.-, M96.-, N99.-)
- ostomy complications (J95.0-, K94.-, N99.5-)
- plateau iris syndrome (post-iridectomy) (postprocedural) H21.82
- poisoning and toxic effects of drugs and chemicals (T36-T65 with fifth or sixth character 1-4)
Broader instructions also apply from T80-T88 Complications of surgical and medical care, not elsewhere classified and Chapter 19: Injury, poisoning and certain other consequences of external causes.
MS-DRG v44.0 grouping
All DRGs →Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.
MDC 21 · Injuries, Poisonings and Toxic Effects of Drugs
Code history
- 2016
- 2017
- 2018
- 2019
- 2020
- 2021
- 2022
- 2023
- 2024
- 2025
- 2026
- 2027
- FY2025 (effective 10/1/2024): Added
- No changes since FY2025.
Common questions about T81.321A
Is T81.321A billable?
- Yes. T81.321A is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
What does the "A" at the end of T81.321A mean?
- It is the 7th character for initial encounter. Per the official guidelines, use it while the patient is receiving active treatment for the condition.
Can T81.321A be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict T81.321A as a principal diagnosis.
Is T81.321A a CC or MCC?
- T81.321A is a CC (complication or comorbidity) under MS-DRG v44.0, unless excluded by the principal diagnosis.
What DRG does T81.321A group to?
- T81.321A is used in the MS-DRG v44.0 logic for MS-DRG 919 (Complications of Treatment with MCC), MS-DRG 920 (Complications of Treatment with CC) and MS-DRG 921 (Complications of Treatment without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.