undercollection

Noun

 * 1) Insufficient collection, as:
 * 2) Insufficient collection of taxes, necessitating administration of corrective billing.
 * 3) Insufficient collection of premiums for insurance, necessitating administration of corrective billing or future rate increases.
 * 4) Insufficient collection of specimens, such as accidental collection of less than 24 hours' worth of urine for a 24-hour urine test.