Spanish to English Medical Medical (general) Latin American medical hi

Happy Sunday to everyone! I'm working on a Colombian hospital bill chart, and I'd like a little help with a category acronym name and acronym used in the column category. Here are the names of the categories in the chart:
CODIGO
DETALLE
CANTIDAD
U/M
VALOR UNITARIO
IMPUESTO %
IMPUESTO VALOR
VALOR TOTAL

Under the U/M category name, the only acronym that appears in the U/M column is "NAR".
Some of the DETALLE items include:
laboratorio clínico
consulta médica o asistencial
hospitalización
otros procedimientos
derechos de sala
medicamentos
Each one of these items shows "NAR" in the U/M column.
As always, a thousand thanks!