2026 ICD-10-CM Diagnosis Code R10.8A2Left flank tenderness

ICD-10-CM Codes›R00–R99›R10-R19›R10

ICD-10-CM R10.8A2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R10.8A2 is a billable ICD-10-CM diagnosis code for left flank tenderness. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 391 through 392. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established.

Code Identity

ICD-10-CM Code
R10.8A2
Billable Status
Yes — Valid for Submission
Code Describes
Left flank tenderness
Short Description
Left flank tenderness
Same as the full description in the CMS dataset.
Parent Code
R10.8A
Flank tenderness

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR10-R19Symptoms and signs involving the digestive system and abdomen
CategoryR10Abdominal and pelvic pain
This CodeR10.8A2Left flank tenderness

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Tenderness, abdominal
      • flank
        • left

Code History & ChangesHistory

New Code R10.8A2 was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement R10.8A2 replaces the following previously assigned code(s):

  • R10.84 - Generalized abdominal pain
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 R10.8A2Overview

Is R10.8A2 (Flank tenderness) a billable code?

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

What MS-DRG does R10.8A2 group to?

When left flank tenderness is the principal diagnosis on an inpatient stay, it groups to MS-DRG 391, 392, with relative weights from 0.7796 to 1.2683 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R10.8A2 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the left flank tenderness is established, that condition takes the principal position instead.