2026 ICD-10-CM Diagnosis Code T81.9XXAUnspecified complication of procedure, initial encounter
T81.9XXA is a billable ICD-10-CM diagnosis code for unspecified complication of procedure, 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. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Complication of other surgical or medical care, injury, initial encounter.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Airway morbidity
- Anesthesia morbidity
- Application site disorder
- Cancer treatment related morbidity
- Cardiovascular morbidity
- Clavien-Dindo classification finding
- Clavien-Dindo classification grade I
- Clavien-Dindo classification grade II
- Clavien-Dindo classification grade III
- Clavien-Dindo classification grade IIIa
- Clavien-Dindo classification grade IIIb
- Clavien-Dindo classification grade IV
- Complication after wiring of sternum
- Complication due to and following cosmetic surgery
- Complication of administrative procedure
- Complication of cryotherapy procedure
- Complication of cutaneous surgery
- Complication of diagnostic procedure
- Complication of electroshock therapy
- Complication of health care
- Complication of hydrotherapy procedure
- Complication of introduction procedure
- Complication of laser surgery
- Complication of manipulation procedure
- Complication of neonatal circumcision
- Complication of observation procedure
- Complication of patch testing
- Complication of physical rehabilitation therapy procedure
- Complication of previous biliary non-surgical procedure
- Complication of procedure
- Complication of puncture procedure
- Complication of reduction procedure
- Complication of respiratory therapy procedure
- Complication of retained tympanic ventilation tube
- Complication of surgical procedure
- Complication of traction procedure
- Complication of ventilation therapy
- Disorder due to and following breast reduction
- Disorder following clinical procedure
- Disorder of dental prosthesis
- Endocrine system complication of procedure
- Iatrogenic complication of vascular surgery
- Intraoperative complication
- Metabolic complication of procedures
- Perioperative complication
- Phototherapy complication
- Post gastrointestinal tract surgery hypoglycemia
- Post-splenectomy disorder
- Regional anesthesia morbidity
- Respiratory morbidity
- Surgical site reaction
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.
Clinical InformationClinical
Intraoperative Complication
a disease or disorder that occurs during the course of a surgical procedure.Intraoperative Complication Management and Prevention|Intraoperative Complication Management/Prevention
any action taken during surgery whose purpose is to mitigate and/or prevent the occurrence of an undesirable outcome.
Convert T81.9XXA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T81.9XXAOverview
Is T81.9XXA (Unspecified complication of procedure) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report unspecified complication of procedure, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T81.9XXA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for unspecified complication of procedure, such as an emergency visit or first evaluation.
What MS-DRG does T81.9XXA group to?
When unspecified complication of procedure, 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.
What is the ICD-9 equivalent of T81.9XXA?
Under the General Equivalence Mappings, unspecified complication of procedure, initial encounter converts to ICD-9-CM 998.9 (surgical complicat NOS). The mapping is approximate, so confirm the match fits the documentation.
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.
