Data De-Identification

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What Does Data De-Identification Mean?

Data de-indentification is a computing standard in which sensitive medical information contained in electronic health records (EHR) can be de-identified so that unauthorized users are unable to read the actual content since it is no longer in its original state. There are two types of data de-indeficiation and they are the statistical method which makes the EHR disconnected to the individual. The second type is deletion of the 18 most common identifiers. Some of these include:

  • Names
  • Cities, street numbers, etc.
  • Date elements such as birthdate, discharge date, etc.
  • Phone numbers
  • Social Security numbers
  • Medical record numbers
  • E-mail addresses

Techopedia Explains Data De-Identification

The de-identifying of data is a proven method in which to de-identify patient data thus keeping it secure. With EHRs rapidly growing in usage throughout various health care institutions, facilities and private practices, privacy groups and legislators are akin to confidentiality assurance for all patients. Not considered the easiest of programming techniques, the data de-identification process can ironically make the designated data unprotected by current privacy laws. That is, once the data is de-identified, it is not considered actual protected medical data.

The way around this is to include a re-identification code. The information can only be re-identified, however, so long as the code is not identifiably connected to the individual for whom the EHR pertains. It should have no way of being translated to reveal their identity. The other strategy is to keep the code ultra-confidential. The person assigning the code must not use nor disclose the actual code for any other reasons other than to re-identify the information. As far as further instructions on de-identifying via statistical methods, the Department of Health and Human Services has these on their website. Done properly, statistical de-identifying should not be obvious.


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Margaret Rouse
Technology Expert
Margaret Rouse
Technology Expert

Margaret is an award-winning technical writer and teacher known for her ability to explain complex technical subjects to a non-technical business audience. Over the past twenty years, her IT definitions have been published by Que in an encyclopedia of technology terms and cited in articles by the New York Times, Time Magazine, USA Today, ZDNet, PC Magazine, and Discovery Magazine. She joined Techopedia in 2011. Margaret's idea of a fun day is helping IT and business professionals learn to speak each other’s highly specialized languages.