2026 ICD-10-CM Diagnosis Code S30.84AAExternal constriction of flank, initial encounter

ICD-10-CM Codes›S00–T88›S30-S39›S30

ICD-10-CM S30.84AA
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

S30.84AA is a billable ICD-10-CM diagnosis code for external constriction 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 604 through 605, 963 through 965.

Code Identity

ICD-10-CM Code
S30.84AA
Billable Status
Yes — Valid for Submission
Code Describes
External constriction of flank, initial encounter
Short Description
External constriction of flank, initial encounter
Same as the full description in the CMS dataset.
Parent Code
S30.84A
External constriction of flank

Code Classification

ChapterS00–T88Injury, poisoning and certain other consequences of external causes
SectionS30-S39Injuries to the abdomen, lower back, lumbar spine, pelvis and external genitals
CategoryS30Superficial injury of abdomen, lower back, pelvis and external genitals
This CodeS30.84AAExternal constriction of flank, initial encounter

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 S30.84AA was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement S30.84AA replaces the following previously assigned code(s):

  • S30.841A - External constriction of abdominal wall, initial encounter
FY 2026AddedAdded to the ICD-10-CM code setEffective October 1, 2025.
FY 2026CurrentRevised in the current code setEffective October 1, 2025 through September 30, 2026.

Questions About S30.84AAOverview

Is S30.84AA (External constriction of flank) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report external constriction of flank, initial encounter on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What does the 7th character A in S30.84AA mean?

The final character A marks the initial encounter: use it while the patient is receiving active treatment for external constriction of flank, such as an emergency visit or first evaluation.

What MS-DRG does S30.84AA group to?

When external constriction of flank, initial encounter is the principal diagnosis on an inpatient stay, it groups to MS-DRG 604, 605, 963, 964, 965, with relative weights from 0.9160 to 2.7338 depending on complications. Higher weights mean higher Medicare reimbursement.