How long one must retain records (paper, or digital) is a function of state
law in the USA, and your own private practice's policy on the topic.
http://www.healthinfolaw.org/comparative-analysis/medical-record-retention-required-health-care-providers-50-state-comparison

-- 
Liz Brooks, JD, IBCLC, FILCA
Wyndmoor, PA, USA
U. S. Breastfeeding Committee: CRASH/Nominations/Donor Milk

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