2026 ICD-10-CM Diagnosis Code T80.1XXAVascular complications following infusion, transfusion and therapeutic injection, initial encounter
ICD-10-CM Codes›S00–T88›T80-T88›T80
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- 7th Character A — Initial Encounter
- Not Chronic
T80.1XXA is a billable ICD-10-CM diagnosis code for vascular complications following infusion, transfusion and therapeutic injection, 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 314 through 316, 791, 793. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 5 closely related codes. Coders also document this condition as necrosis following injection of local anesthetic. 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.
- Necrosis following injection of local anesthetic
- Phlebitis after infusion
- Phlebitis following perfusion
- Phlebitis following transfusion
- Pseudoaneurysm of vascular access site
- Superficial thrombophlebitis following administration of drug via intravenous route
- Thromboembolism after infusion
- Thrombophlebitis after infusion
- Thrombophlebitis following perfusion
- Thrombophlebitis following transfusion
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Complications following infusion, transfusion and therapeutic injection (T80). 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.
Convert T80.1XXA to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About T80.1XXAOverview
Is T80.1XXA a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report vascular complications following infusion, transfusion and therapeutic injection, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in T80.1XXA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for vascular complications following infusion, transfusion and therapeutic injection, such as an emergency visit or first evaluation.
What MS-DRG does T80.1XXA group to?
When vascular complications following infusion, transfusion and therapeutic injection, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 314, 315, 316, 791, 793, with relative weights from 0.6821 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is T80.1XXA a CC or MCC?
CMS lists T80.1XXA as a CC (complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 5 closely related codes in its exclusion list.
What is the ICD-9 equivalent of T80.1XXA?
Under the General Equivalence Mappings, vascular complications following infusion, transfusion and therapeutic injection, initial encounter converts to ICD-9-CM 999.2 (vasc comp med care NEC). The mapping is approximate, so confirm the match fits the documentation.
