2026 ICD-10-CM Diagnosis Code R39.859Costovertebral (angle) tenderness, unspecified side

ICD-10-CM Codes›R00–R99›R30-R39›R39

ICD-10-CM R39.859
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R39.859 is a billable ICD-10-CM diagnosis code for costovertebral (angle) tenderness, unspecified side. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 695 through 696. 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
R39.859
Billable Status
Yes — Valid for Submission
Code Describes
Costovertebral (angle) tenderness, unspecified side
Short Description
Costovertebral (angle) tenderness, unspecified side
Same as the full description in the CMS dataset.
Parent Code
R39.85
Costovertebral (angle) tenderness

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR30-R39Symptoms and signs involving the genitourinary system
CategoryR39Other and unspecified symptoms and signs involving the genitourinary system
This CodeR39.859Costovertebral (angle) tenderness, unspecified side

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
      • costovertebral (angle)

Code History & ChangesHistory

New Code R39.859 was added to the ICD-10-CM code set for FY 2026, effective October 1, 2025.

Replacement R39.859 replaces the following previously assigned code(s):

  • R39.89 - Other symptoms and signs involving the genitourinary system
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 R39.859Overview

Is R39.859 (Costovertebral (angle) tenderness) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report costovertebral (angle) tenderness, unspecified side on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does R39.859 group to?

When costovertebral (angle) tenderness, unspecified side is the principal diagnosis on an inpatient stay, it groups to MS-DRG 695, 696, with relative weights from 0.6890 to 1.1438 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R39.859 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the costovertebral (angle) tenderness, unspecified side is established, that condition takes the principal position instead.