2026 ICD-10-CM Diagnosis Code S30.82AABlister (nonthermal) of flank, initial encounter
S30.82AA is a billable ICD-10-CM diagnosis code for blister (nonthermal) of flank, 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 606 through 607.
Code Identity
Code Classification
Coding GuidelinesGuidance
The appropriate 7th character is to be added to each code from block Superficial injury of abdomen, lower back, pelvis and external genitals (S30). 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.
Code History & ChangesHistory
New Code S30.82AA was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.
Replacement S30.82AA replaces the following previously assigned code(s):
- S30.821A - Blister (nonthermal) of abdominal wall, initial encounter
Questions About S30.82AAOverview
Is S30.82AA (Blister (nonthermal) of flank) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report blister (nonthermal) of flank, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What does the 7th character A in S30.82AA mean?
The final character A marks the initial encounter: use it while the patient is receiving active treatment for blister (nonthermal) of flank, such as an emergency visit or first evaluation.
What MS-DRG does S30.82AA group to?
When blister (nonthermal) of flank, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 606, 607, with relative weights from 0.9064 to 1.5132 depending on complications. Higher weights mean higher Medicare reimbursement.
