Genitourinary system (kidneys, urinary tract-genital organs) (N00-N99).
- Gonococcal urethritis – inflammation of the urethra caused by gonococci.
- Mycoplasma urethritis – urethritis caused by mycoplasma, type of bacteria without cell wall.
- Trichomonad urethritis – urethritis caused by trichomonads, which are protozoa (single-celled organisms).
- Urethritides caused by various other bacteria or by viruses such as herpes simplex virus.