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  6. 2026 ICD-10-CM Code R39.859

2026 ICD-10-CM Diagnosis Code R39.859

Costovertebral (angle) tenderness, unspecified side

ICD-10-CM Code:
R39.859
ICD-10 Code for:
Costovertebral (angle) tenderness, unspecified side
Is Billable?
Yes - Valid for Submission
Code Navigator:

R39.859 is a billable diagnosis code used to specify a medical diagnosis of costovertebral (angle) tenderness, unspecified side. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

Unspecified diagnosis codes like R39.859 are acceptable when clinical information is unknown or not available about a particular condition. Although a more specific code is preferable, unspecified codes should be used when such codes most accurately reflect what is known about a patient's condition. Specific diagnosis codes should not be used if not supported by the patient's medical record.

According to ICD-10-CM guidelines this code should not to be used as a principal diagnosis code when a related definitive diagnosis has been established.

Code Classification

  • Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
    R00–R99
    • Symptoms and signs involving the genitourinary system
      R30-R39
      • Other and unspecified symptoms and signs involving the genitourinary system
        R39

New 2026 ICD-10-CM Code

R39.859 is new to ICD-10-CM code set for the FY 2026, effective October 1, 2025. The National Center for Health Statistics (NCHS) has published an update to the ICD-10-CM diagnosis codes which became effective October 1, 2025. This is a new and revised code for the FY 2026 (October 1, 2025 - September 30, 2026).

Index to Diseases and Injuries References

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

Index of External Cause of Injuries

References found for this diagnosis code in the External Cause of Injuries Index:

    • Tenderness, abdominal
      • costovertebral (angle)

Replacement Code

R39859 replaces the following previously assigned ICD-10-CM code(s):

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

Code History

  • FY 2026 - Code Added, effective from 10/1/2025 through 9/30/2026