R39.85Costovertebral (angle) tenderness

R39.85 is the ICD-10-CM diagnosis code for Costovertebral (angle) tenderness. It belongs to category R39 (other and unspecified symptoms and signs involving the genitourinary system), block R30-R39 (symptoms and signs involving the genitourinary system) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is a header code, so it can't be reported by itself; one of its 4 subcodes must be used instead.

Within R39.8 (other symptoms and signs involving the genitourinary system), R39.85 is specifically for Costovertebral (angle) tenderness. Related codes cover functional urinary incontinence (R39.81), chronic bladder pain (R39.82), unilateral non-palpable testicle (R39.83), bilateral non-palpable testicles (R39.84) and other symptoms and signs involving the genitourinary system (R39.89).

To report this condition, pick the subcode that matches the documentation: R39.851 (right side), R39.852 (left side), R39.853 (bilateral) and R39.859 (unspecified side).

The conditions in its Excludes2 note aren't part of R39.85, but may be coded alongside it if the patient has both: abdominal and pelvic pain (R10.-).

It was added in FY2026, effective October 1, 2025.