R10.ANon-Billable (Header)Pain localized to flankExcludes 2 — Not included here, may code separatelypain localized to other parts of lower abdomen (R10.3-)pain localized to upper abdomen (R10.1-)Child CodesR10.A0Flank pain, unspecified sideR10.A1Flank pain, right sideR10.A2Flank pain, left sideR10.A3Flank pain, bilateralCode Hierarchy└R10Abdominal and pelvic pain└R10.APain localized to flank└R10.APain localized to flank