Patient presents with a history of pyelonephritis.  The patient reports previous episodes of acute pyelonephritis, confirmed by documented urinary tract infection (UTI) with flank pain, fever, chills, nausea, and vomiting.  Prior urinalysis results demonstrated pyuria, bacteriuria, and positive leukocyte esterase and nitrites.  Past medical history includes recurrent UTIs, possibly associated with anatomical abnormalities or functional bladder issues.  The patient may have received prior antibiotic treatment for pyelonephritis with agents such as fluoroquinolones, cephalosporins, or trimethoprim-sulfamethoxazole.  Current symptoms may include persistent or recurrent flank pain, dysuria, frequency, urgency, or malaise.  Differential diagnosis includes other causes of flank pain such as nephrolithiasis or musculoskeletal pain.  Plan includes assessment for recurrent UTI symptoms, urinalysis with culture and sensitivity, and consideration for renal imaging such as ultrasound or CT scan to evaluate for underlying kidney abnormalities or complications like renal scarring or abscess.  Patient education regarding preventative measures for UTIs, such as increasing fluid intake and proper hygiene, will be provided.  Follow-up care will be arranged to monitor symptom resolution and ensure appropriate management of any underlying conditions contributing to recurrent pyelonephritis.  ICD-10 code N11.8 will be considered for history of pyelonephritis, and additional codes may be necessary depending on presenting symptoms and diagnostic findings.