Medical Policy: 02.01.02
Original Effective Date: November 2003
Reviewed: February 2018
Revised: February 2018
Benefit determinations are based on the applicable contract language in effect at the time the services were rendered. Exclusions, limitations or exceptions may apply. Benefits may vary based on contract, and individual member benefits must be verified. Wellmark determines medical necessity only if the benefit exists and no contract exclusions are applicable. This medical policy may not apply to FEP. Benefits are determined by the Federal Employee Program.
This Medical Policy document describes the status of medical technology at the time the document was developed. Since that time, new technology may have emerged or new medical literature may have been published. This Medical Policy will be reviewed regularly and be updated as scientific and medical literature becomes available.
Allergic or hypersensitivity disorders can manifest themselves as generalized systemic reactions as well as localized reactions in any organ system of the body. Numerous agents, e.g., pollen, mold, dust mites, animal dander, insect stings, foods or drugs may precipitate allergic or hypersensitive reactions. For details on treatment of allergies, see Policy 02.01.01, Allergy Immunotherapy.
The management of an allergic patient should include a comprehensive history, physical examination and should include confirming the cause of allergies. Once the agent is identified, treatment is provided by avoidance, medication or immunotherapy. Skin testing would be the first line of testing for the majority of patients. In vitro testing would be appropriate necessary for those with the inability to stop specific medications and those that have had severe allergic responses to medicine, food, inhalants, and insectsand insects. It would be inappropriate to use in vitro testing for the majority of patients as the first line of testing.
Allergy is a hypersensitive reaction that is usually manifested in the clinical form of allergic asthma, hay fever or eczema developing within minutes to a few hours after exposure to an antigen. The most common types of allergies are rhinitis, asthma, food allergy, insect sting allergy, drug allergy and contact dermatitis. Allergy testing is focused on determining what allergens cause a particular reaction and the degree of the reaction and provides justification for recommendations of specific avoidance measures in the home or work environment or the institution of particular medicines or immunotherapy. There are virtually no age limitations for performance of skin tests. However, skin test reactivity may be diminished in infants and the elderly. Types of allergy testing include in vivo, in vitro, provocation testing, and controversial allergy tests. The umbrella term ‘food hypersensitivity or food sensitivities’ can be used to describe any ‘adverse reaction to food’. The term ‘food allergy’ refers to the subgroup of food-triggered reactions in which immunologic mechanisms have been implicated, whether IgE- mediated, non-IgE-mediated, or involving a combination of IgE- and non-IgE-mediated etiologies. All other reactions to food that were in the past sometimes referred to as ‘food intolerance’ or ‘food sensitivities’ constitute non-allergic food hypersensitivity reactions and are not considered allergies.
Allergy tests detect the presence of IgE antibodies to a particular allergen, or something that causes an allergic reaction. A positive test suggests allergic sensitization to a specific allergen. There are several in-vitro tests available to diagnose allergies, however, the National Medical and Research Center believes that standard intradermal or epicutaneous skin tests in correlation with a thorough medical history and physical examination best serves the patient. A positive skin test alone does not diagnose an allergy; it must correlate with symptoms experienced when the patient has an allergen exposure.
Patch Testing: Patch testing can be performed either using a preloaded thin-layer rapid use epicutaneous testing kit of 36 chambers or with a panel of antigens loaded individually in a chamber system recommended by the North American Contact Dermatitis Group (NACDG) Research Group or the American Contact Dermatitis Society (ACDS). The patch test procedure can induce an eczematous reaction in miniature by applying suspect allergens to normal skin, allowing the physician to determine a specific patient allergy. Patch tests are applied to the skin on the patient's back and left in place for 48 hours. The test is interpreted after 48 hours, and typically once again at 72 hours or 96 hours, and the reactions are systemically scored and recorded. The patient is then informed and educated regarding specific allergies and avoidance of exposure. Avoidance of the identified allergen(s) is critical to patient improvement and resolution of the dermatitis.
Photo testing and photo patch testing: Some chemicals produce an allergic reaction only when exposed to light (usually ultraviolet type A light, UVA). Patients who are oversensitive to light and those with a rash that appears on parts of the body normally exposed to light (mostly the face, the 'V' of the neck and the hands) but that does not appear in areas shielded from the light (eg under the chin and the triangle between the nose and the mouth) should have a photo or phot-patch test to determine if light is causing the allergic reaction. Photo testing and photo patch testing are indicated to evaluate a nonspecific photo sensitive dermatitis, photo sensitive allergic contact dermatitis or photo sensitive pruritus, to determine the causative antigen. Photo-patch testing should be done in clinical settings with the expertise, materials, and equipment to perform the procedure. In brief, duplicate applications of the suspected photo-sensitizer(s) are placed on either side of the upper back, and occluded for 24 to 48 hours. A recent study suggests that 2 days of occlusion before irradiation of allergens is more sensitive at detecting photoallergy. After patch removal, one side of the back is then irradiated with 5 J cm 2 of UVA and the other side is left open but untreated as the control. Both irradiated and unirradiated sides are then measured 48 hours after irradiation for a response. Photo tests are used to evaluate skin abnormalities—such as rash, itching, blisters, and hives—that are either caused or exacerbated by exposure to sunlight. In standard photo tests, small areas of skin are irradiated with different doses of long- and short-wave ultraviolet (UVA and UVB) and visible light, and then observed for a reaction.
The American Academy of Allergy Asthma and Immunology (AAAAI) Expert Panel suggests that the atopy patch test should not be used in the routine evaluation of noncontact food allergy. Insufficient evidence exists to support the use of the atopy patch test for the evaluation of food allergy. Although a number of studies have reported that the patch testing may be useful in the evaluation of food allergies in patients with atopic dermatitis and eosinophilic esophagitis, there is no agreement on the appropriate reagents, methods, or interpretation of these tests. When compared with oral food challenges, patch testing shows highly variable sensitivity and specificity among different studies.
The Choosing Wisely initiative includes the following recommendations from the American Academy of Asthma, Allergy, and Immunology regarding allergy testing:
One of the AAAAI’s (American Academy of Allergy, Asthma and Immunology) “Five Things Physicians and Patients Should Question” (2012) noted that “Appropriate diagnosis and treatment of allergies requires specific IgE testing (either skin or blood tests) based on the patient’s clinical history. The use of other tests or methods to diagnose allergies is unproven and can lead to inappropriate diagnosis and treatment”. The AAAAI stated that “Don’t perform unproven diagnostic tests, such as immunoglobulin G (IgG) testing or an indiscriminate battery of immunoglobulin E (IgE) tests, in the evaluation of allergy”.
Updated Practice Parameter (2012) states: Summary Statement 127. IgG and IgG subclass antibody tests for food allergy do not have clinical relevance, are not validated, lack sufficient quality control, and should not be performed.
Evidence of IgE sensitization to common food and appropriate aeroallergens can support a diagnosis of food allergy in conjunction with clinical history and/or food challenge. The clinical utility of measuring serum food IgE and to generate a successful elimination diet needs further investigation. There are no unconventional tests which can be recommended as an alternative or complementary diagnostic tool in the workup of suspected food allergy, and their use should be discouraged.
The following allergy tests are considered medically necessary, if the following indications are met, with the following limits:
Percutaneous (scratch, puncture, prick) and intracutaneous (intradermal) allergy testing are considered medically necessary and, therefore, covered for the diagnosis, evaluation, and treatment of allergies when there are signs and symptoms or a diagnosis suggestive of an allergy (eg, a history of hypersensitivity to animals, food, pollen, dust mites, mold, grass, insect venoms; or asthma, allergic rhinitis, urticaria) with the following limitations:
A cumulative total of 70 scratch, puncture, or prick allergy tests are eligible for reimbursement per calendar year (CPT code 95004).
A cumulative total of 40 intracutaneous allergy tests (which should only follow negative scratch, puncture, or prick tests) are eligible for reimbursement per calendar year (CPT codes 95024 and 95028).
Skin serial endpoint titration (SET) for determination of a safe starting dose for testing or immunotherapy when there is potential for the specific allergen in question to produce a severe systemic reaction or anaphylaxis and it is an approved indication for immunotherapy. The use of serial endpoint testing should not replace routine use of prick/puncture testing. Serial endpoint titration (SET) testing (eg, intradermal dilutional testing [IDT]) is considered medically necessary with a cumulative total of 80 tests being eligible for reimbursement per calendar year (CPT codes 95017, 95018, and 95027).
Patch testing is the gold standard method of identifying the cause of allergic contact dermatitis. This testing is indicated to evaluate:
to determine the causative antigen. It is a diagnostic test reserved for patients with skin eruptions for which a contact allergy source is likely.
Patch testing (95004) is limited to 42 units.
Standard panels of allergens for patch testing are available from various commercial sources. Each standard patch test unit includes 35 common allergens and a negative control. In addition to the standard series of 36 patch tests, six (6) additional allergens may be performed initially. Allergy testing in excess of the above limits is considered not medically necessary.
Patch test should not be used in the routine evaluation of noncontact food allergy. Insufficient evidence exists to support the use of the atopy patch test for the evaluation of food allergy. Patch testing for food allergy will be considered not medically necessary.
Patch testing outside of these diagnoses will be considered not medically necessary.
Photo testing (95056) and photo patch testing (95052) are indicated to evaluate:
Photo testing and photo-patch testing outside of these diagnosis will be considered not medically necessary.
Multiallergen screening (CPT code 86005) is a qualitative test that does not quantify specific antigens; therefore, it is considered not medically necessary and not covered. Multiallergen screening is considered not medically necessary and, therefore, not covered because the available published peer-reviewed literature does not support its use in the treatment of illness.
The following allergy tests are considered investigational because the scientific literature has not provided proof of their efficacy:
The use of in vitro (blood) (86003) allergy testing for IgE should be limited to individuals where skin testing is not possible. There would rarely be a need for testing beyond 36 tests per year. Testing implemented beyond 48 tests will be denied as not medically necessary.
Allergy testing is generally considered diagnostic: retesting is considered not medically necessary.
Wellmark medical policies address the complex issue of technology assessment of new and emerging treatments, devices, drugs, etc. They are developed to assist in administering plan benefits and constitute neither offers of coverage nor medical advice. Wellmark medical policies contain only a partial, general description of plan or program benefits and do not constitute a contract. Wellmark does not provide health care services and, therefore, cannot guarantee any results or outcomes. Participating providers are independent contractors in private practice and are neither employees nor agents of Wellmark or its affiliates. Treating providers are solely responsible for medical advice and treatment of members. Our medical policies may be updated and therefore are subject to change without notice.
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