The difference between sexually transmitted disease (STD) and sexually transmitted infection (STI) is more than a semantic one and has implications with respect to the setting in which STI screening tests are ordered and the cost of the tests.
Infectious disease of any type differs from infection alone in that disease connotes signs and/or symptoms of illness. Likewise STD differs from STI in that STD is associated with signs and/or symptoms of the infection causing the STD, whereas as STI is oftentimes silent and hidden. Although the latter is sometimes referred to as asymptomatic STD the more appropriate or accurate term is STI because it is a state of being infected with or without signs or STD symptoms. In essence, STI, which came into vogue in recent years, is an all-inclusive term, which refers to both STD and sexually transmitted infection. It also represents what used to be commonly called venereal disease or VD.
A glaring example of the distinction between STD and STI is acquired immune deficiency syndrome (AIDS) and HIV infection. AIDS is the result of infection with the HIV virus, but not everyone with HIV infection has AIDS. Individuals with AIDS have significant signs and STD symptoms associated with the infection including evidence of weakening of the immune system resulting in the predisposition for becoming secondarily infected with other germs that don't normally infect people with intact immune systems. Individuals infected with the HIV virus but without AIDS symptoms or signs of a compromised immune system are at risk of developing AIDS but until evidence of disease is manifested are considered to have just HIV infection.
The semantic difference between STD and STI has implications with respect to test proceedings. Since disease is associated with signs and/ or symptoms of illness, disease testing is performed when disease is suspected based on the presence of either or both of these indicators of illness. Disease screening on the other hand, is the testing performed when one has an increased likelihood of illness even though signs and/or symptoms of the particular illness are not present at the time of testing. Screening tests for heart disease, for example, might be based on a positive family history of heart disease, obesity, or other risk factors such as high blood pressure. Similarly, STI screening is performed based on the likelihood of STI because of an increased risk based on one's sexual activity. Conversely, STD testing is performed to confirm or exclude suspected disease based on the presence of symptoms or signs of STD.
The semantic distinction between STI screening and STD testing influences the setting in which tests are ordered and the cost of testing. If one has health insurance and undergoes testing according to a doctor's order because of STD symptoms or signs the test(s) are generally billed to the insurance company and paid for by the insurance carrier. On the other hand, if one undergoes STI screening as ordered by a physician the cost of the test(s) in most instances will not be covered by the health insurance carrier, in which case the individual tested would be responsible for the cost of the tests.
Before paying claims health insurance companies determine if services were appropriate based on the reason(s) they were provided. Every service including laboratory tests has a unique service code called a CPT code, and every diagnosis, whether it is a specific disease or a matching sign or symptom of a particular disease, has a unique diagnosis code called an ICD-9 (soon to be changed to ICD-10) code. Since the diagnosis code conveys the reason a particular service was provided insurance companies compare the two codes during the claim review process.
If the diagnosis code supports the service code the claim is paid as long the service provided is a benefit of the particular health insurance plan. Therefore, if appropriate STD/STI testing is done to establish a diagnosis, a supporting diagnosis code will exist to justify payment of the insurance claim. In contrast however, a valid diagnosis code will not exist to justify STI screening because of the absence of symptoms or signs of STD, in which case the health insurance carrier generally would not cover the cost of the test(s) unless limited STI screening is a special benefit of the particular insurance plan.
Because the cost of STI screening ordered through a doctor's office or clinic can be quite expensive and is not covered by insurance, comprehensive screening is usually not ordered in that setting, and is not included with a wellness health exam because of the absence of symptoms or signs of STD. An online STD/STI testing service, however, is a viable option inasmuch it offers comprehensive screening test panels at a considerably lower price and provides private online test ordering as well as confidential online test results. Some services provide testing for trichomonas, Chlamydia, gonorrhea and HIV on specimens privately collected and mailed in.
An increased understanding of STI screening and its role in reducing the transmission of sexually transmitted infections, hopefully will engender an enhanced rate of screening and thus be instrumental in stemming the tide of the current STD/STI epidemic which currently plagues our society.
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