ICD code description N10 Acute tubulo-interstitial nephritis N12 Tubulo-interstitial nephritis, not specified as acute or chronic N13.6 Pyonephrosis N15.1 Renal and perinephric abscess N15.9 Renal tubulo-interstitial disease, unspecified N30.0 Acute cystitis N30.8 Other cystitis N30.9 Cystitis, unspecified N39.0 Urinary tract infection, site not specified