Coconut allergy FAQ: airborne, hereditary, pregnancy, dogs, the ICD-10 code and other small questions

The long questions have their own guides. These are the short ones: things people type into a search box and get a forum thread or a sales page for. Each answer is a paragraph, with the source it rests on. Where the honest answer is "nobody has studied it", it says so.

Does coconut allergy really exist, and how rare is it?

It exists and it is uncommon. The only population survey, of 78,851 people in the United States, found that 0.39% met the criteria for a convincing coconut food allergy, about 1 in 260 people; among children it was 0.22% and among adults 0.43% [1]. Australia's allergy society calls allergic reactions to eating coconut "relatively rare" and notes that contact dermatitis from coconut-derived ingredients is more common [2]. Anaphylaxis UK says it believes the allergy is rare in the UK, with no precise figures [3]. The numbers in full.

Is coconut allergy airborne? Can the smell set off a reaction?

Smell, no. Smell is made of small molecules, and an allergic reaction is to protein; as a Swedish researcher put it after sitting 84 peanut-allergic children half a metre from an open bowl of peanuts, the odour molecules do not consist of proteins, and only proteins cause the allergy. Two of those children had itchy eyes; none had a serious reaction [4]. Airborne reactions to food do happen, but from protein in the air: steam from boiling milk, frying fish, flour dust [5]. In the one study that counted, aerosolised food caused about 6% of children's food anaphylaxis, against 78% from eating [6]. For coconut specifically, the published airborne cases are occupational and about dust, not food: allergic conjunctivitis in a worker making coconut-fibre mattresses [7], and respiratory allergy among coir workers (see the coir question below). Coconut-scented sunscreen on the next towel is not a documented danger. Coconut-oil fumes from a hot pan would be the thing to test cautiously, and nobody has.

Is coconut allergy hereditary?

Partly, like other food allergies; nobody has studied coconut on its own. In identical twins, if one has peanut allergy the other does too 64% of the time, against 7% in non-identical twins, which puts the heritability of peanut allergy around 80% [8]. In a large Australian infant study, having two or more allergic family members raised a baby's risk of food allergy 1.8-fold [9]. Among Americans with a convincing coconut allergy, 46% reported a parent with a food allergy, though that was self-reported [1]. What you inherit is the tendency to be allergic, not an allergy to coconut in particular.

Should I avoid coconut in pregnancy or while breastfeeding to protect the baby?

No. The American Academy of Pediatrics states that current evidence does not support maternal dietary restrictions during pregnancy or lactation [10]; the American and Canadian allergy colleges say maternal exclusion of allergens to prevent food allergy is not recommended [11]; the European academy advises against it [12]; Australia's guideline says it is not necessary [13]; and the NHS tells pregnant and breastfeeding women they do not need to avoid trigger foods unless they are allergic themselves [14]. If you are the one with the allergy, you avoid coconut for your own sake, as before. The breastfeeding guide has the detail, including what reaches breast milk.

I'm allergic to peanuts or tree nuts. Should I avoid coconut?

Not as a rule. Coconut is a palm fruit, not a nut, and the "nut" in its name does not mean it will trigger a reaction in people allergic to peanuts or tree nuts [2]. In a study of children sensitised to peanut or tree nuts, they were no more likely than other children to be sensitised or allergic to coconut [15]. The American College of Allergy says most people allergic to tree nuts can eat coconut [16], and Anaphylaxis UK says there is no general recommendation that tree-nut-allergic patients avoid it [3]. A few people are allergic to both [2], and an AAAAI expert puts the extra risk for a tree-nut-allergic child as "probably slight" [17]. If you have never eaten coconut and have a nut allergy, ask your allergist rather than guessing. Since January 2025 the US FDA no longer lists coconut as a tree nut for labelling either [18]; the full story is here.

My blood test for "mixed nuts" came back positive. Does that mean I'm allergic to coconut?

Not by itself. A common laboratory panel, the ImmunoCAP fx1 "mixed nuts" test, includes coconut alongside peanut, hazelnut, Brazil nut and almond. A positive result means a reaction to at least one of them, not to all of them [3]. The next step is testing the single foods, and the history of what actually happened when you ate them. How the tests work.

Can I be allergic to coconut but not to coconut oil?

Yes, and it is common, because the allergy is to coconut protein and refined oil contains almost none. Sri Lankan researchers measured about 30 times more protein in unrefined coconut oil than in refined (250 against 7.9 micrograms per millilitre), and advised coconut-allergic patients to avoid the unrefined kinds [19]. An AAAAI expert states that refined coconut oil should not contain protein allergens [20], and another could find no convincing published reaction to coconut oil at all [21]. Anaphylaxis UK is more cautious, because most coconut oil sold for cooking is cold-pressed, which is unrefined [22]. The practical reading: "virgin" and "cold-pressed" are the ones to treat as coconut. The oil guide.

What is the ICD-10 code for coconut allergy?

There is no code that names coconut: the word does not appear anywhere in the current US code set [23]. Doctors use the general codes:

• Z91.018, "Allergy to other foods", for the allergy as a standing condition on your record [23].
• T78.04XA, "Anaphylactic reaction due to fruits and vegetables", or T78.09XA, "due to other food products", for an anaphylactic reaction (the seventh character changes for follow-up visits). Some coders still use T78.05XA, the tree-nut code, out of habit; since the FDA change coconut is better placed under fruit [23].
• T78.19XA for other adverse food reactions. This replaced T78.1XXA on 1 October 2025, and many websites still show the old code [24].
• L23.89 or L23.9 for allergic contact dermatitis from a coconut-derived ingredient, and K52.21 for FPIES [23].

If a form asks you for "the coconut allergy code", Z91.018 is the one.

Can an antihistamine like Benadryl treat a coconut reaction?

A mild one, yes: a few hives, an itchy mouth. Not anaphylaxis. An antihistamine blocks histamine, which is only one part of an anaphylactic reaction, so it does not treat anaphylaxis effectively, in the American College of Allergy's words [25]; Australia's guideline says antihistamines have no role in treating the breathing or circulation symptoms of anaphylaxis [26]. For those, adrenaline, then an ambulance, even if you feel better [14]. Being ready for a reaction and treatment.

Can coconut give you a headache or a migraine?

Nobody has shown it. Headache is not on the list of food allergy symptoms [27], and there is no published study linking coconut to migraine. Coconut appears on some migraine charities' lists of "potential triggers" [28], and the usual suspect in such lists, tyramine, has inconclusive evidence even for the foods that contain a lot of it [29]; fresh coconut is not a fermented food, so it would not be expected to carry much. If coconut reliably gives you a headache, a diary is the only tool that exists; it is not a sign of allergy.

Why does coconut give me stomach pain or diarrhoea if I'm not allergic?

Three possibilities. First, an allergy can show as gut symptoms: being sick, tummy pain and diarrhoea are on the NHS's list [27], and one of the earliest published coconut reactions was severe stomach upset in a baby fed a formula containing coconut [2]. Second, FPIES, a delayed non-IgE allergy that causes repeated vomiting one to four hours after the food and cannot be diagnosed with blood or skin tests [30]; coconut is among the foods families in an FPIES survey reported avoiding, though no case had been formally published when they wrote [31]. Third, and most often, fat: coconut is rich in medium-chain fats, and MCT oil is known to cause abdominal discomfort and diarrhoea, especially in people not used to it, three of seven volunteers in one early study after 25 ml [32]. Dogs get it too (see below).

Does Malibu rum contain coconut? Why isn't it on the label?

Malibu Original is, in the maker's words, a white-rum-based spirit with coconut liqueur, and the company says it contains no coconut milk, coconut cream or dairy; it does not publish an ingredient list [33]. Anaphylaxis UK lists Malibu among the products coconut-allergic people need to watch [3]. It is not on the label because spirits are exempt from ingredient listing in the EU above 1.2% alcohol [34], and in the US allergen labelling on alcohol is voluntary [35]. Coconut is not a mandatory allergen in either place anyway, so even an allergen rule would not put it on the bottle.

Are coconut aminos, coconut sugar and coconut vinegar coconut?

They come from the tree but not from the nut. All three are made from the sap tapped from the unopened flower: coconut sugar is the sap boiled down [36], coconut aminos are the sap fermented with salt [37], and coconut vinegar is fermented sap or, in some products, fermented coconut water [36]. Whether sap carries the proteins people are allergic to has not been tested. Coconut sugar, flour, aminos and vinegar goes through them one by one.

Are coconut alkanes, coconut acid and cocamide DEA coconut?

Yes, all three, by their definitions in the European cosmetics ingredient database: coconut alkanes are hydrocarbons made from the fatty acids of coconut oil [38], coconut acid is the fatty acids of coconut oil [39], and cocamide DEA, also called coconut diethanolamide, is made from them too [40]. Australia's allergy society names coconut diethanolamide and cocamide DEA among the coconut-derived ingredients that cause contact dermatitis [2]. Each has its own page: coconut alkanes, cocamide DEA, and the full list.

Is there such a thing as coconut pollen allergy?

Yes, and it is separate from the food allergy. Sensitisation to coconut pollen has been reported [2]. In eastern India, where coconut palms are everywhere, 46% of 70 patients with respiratory allergy had a positive skin test to coconut pollen [41], and a 1994 trial treated 96 people allergic to it with pollen immunotherapy [42]. This is a hay-fever-type allergy in the tropics. It is also why some pages claim "immunotherapy for coconut allergy" exists: the trial they cite was about pollen, not food.

Can you be allergic to coconut husk or coir (doormats, mattresses, garden liners)?

The dust can irritate airways, and in a few people it causes allergy, but the evidence is thin and mixed. A 1975 study of 779 coir workers in Sri Lanka found no clear link between coir dust and chest disease [43]; a 2010 study of 624 coir workers in Kerala with symptoms found nasal and bronchial allergy in most of them [44]; and there is the single case of allergic conjunctivitis from coconut-fibre dust in a mattress factory [7]. Nothing links household coir to food allergy, and the fibre is not the part of the coconut that carries the food allergens. A coir doormat is not a reason to worry; a job breathing coir dust all day might be.

Can dogs be allergic to coconut? Is coconut oil bad for dogs?

Veterinary sources do not describe coconut allergy in dogs; the common food allergens for dogs are beef, dairy, chicken, wheat and lamb [45]. The problem with coconut for dogs is fat: the ASPCA says small amounts are unlikely to cause serious harm, but fresh coconut flesh and milk contain oils that can cause stomach upset and diarrhoea [46], and the American Kennel Club warns that feeding coconut oil long-term can lead to obesity and even pancreatitis [47]. This is a site about people; for a dog that reacts to food, the person to ask is a vet.

Related

The complete guide · Symptoms · Testing · Treatment · Is coconut a tree nut? · How we work

Sources

1. Warren C.M., Sehgal S., Nimmagadda S.R., Gupta R. “Prevalence and burden of coconut allergy in the United States.” Annals of Allergy, Asthma & Immunology, 2023; 131(5): 645–654. PMC
2. ASCIA. “Coconut allergy”, updated April 2024. allergy.org.au
3. Anaphylaxis UK. “Coconut allergy” factsheet, 2019. PDF
4. Karolinska Institutet. “Airborne exposure to peanuts did not produce severe reactions”, 2021, on Nilsson et al., Clinical & Experimental Allergy. ki.se
5. FARE. “Tips for keeping safe at home.” foodallergy.org
6. Ridolo E., Incorvaia C., Schroeder J.W. Review of airborne food allergy and anaphylaxis. Current Opinion in Allergy and Clinical Immunology, 2022. PMC
7. Wittczak T., Pas-Wyroslak A., Palczynski C. “Occupational allergic conjunctivitis due to coconut fibre dust.” Allergy, 2005; 60(7): 970–971. PubMed
8. Sicherer S.H. et al. “Genetics of peanut allergy: a twin study.” Journal of Allergy and Clinical Immunology, 2000; 106(1): 53–56. PubMed
9. Koplin J.J. et al. HealthNuts study of family history and infant food allergy. International Journal of Environmental Research and Public Health, 2013. PMC
10. Greer F.R., Sicherer S.H., Burks A.W. “The Effects of Early Nutritional Interventions on the Development of Atopic Disease in Infants and Children.” Pediatrics, 2019. PubMed
11. Fleischer D.M. et al. Consensus approach to the primary prevention of food allergy through nutrition (AAAAI, ACAAI, CSACI). Journal of Allergy and Clinical Immunology: In Practice, 2021. PubMed
12. Halken S. et al. “EAACI guideline: Preventing the development of food allergy in infants and young children (2020 update).” Pediatric Allergy and Immunology, 2021. PubMed
13. ASCIA. “Infant feeding for food allergy prevention” guideline, updated January 2026. allergy.org.au
14. NHS. “Food allergies in babies and young children.” nhs.uk · NHS. “Food allergy.” nhs.uk
15. Stutius L.M. et al. “Characterizing the relationship between sesame, coconut, and nut allergy in children.” Pediatric Allergy and Immunology, 2010; 21(8): 1114–1118. PubMed
16. ACAAI. “Tree nut allergy.” acaai.org
17. AAAAI, Ask the Expert. “Reaction to coconut.” aaaai.org
18. US FDA. “Frequently Asked Questions: Food Allergen Labeling Guidance for Industry.” fda.gov
19. Iddagoda J. et al. “Identification of allergens in coconut milk and oil with patients sensitized to coconut milk in Sri Lanka.” Clinical and Molecular Allergy, 2022. PMC
20. AAAAI, Ask the Expert. “Coconut.” November 2025. aaaai.org
21. AAAAI, Ask the Expert. “Coconut oil and palm oil with multiple food allergies.” aaaai.org
22. Anaphylaxis UK. “Plant-based oils” factsheet. anaphylaxis.org.uk
23. US Centers for Medicare & Medicaid Services. ICD-10-CM code descriptions, fiscal year 2027 files. cms.gov
24. US Centers for Medicare & Medicaid Services. ICD-10-CM fiscal year 2026 addenda (T78.1XXA deleted, T78.19XA added). cms.gov
25. ACAAI. “Severe reactions: anaphylaxis and epinephrine.” acaai.org
26. ASCIA. “Acute management of anaphylaxis” guidelines. allergy.org.au
27. NHS. “Food allergy.” nhs.uk
28. Association of Migraine Disorders. “Migraine-safe foods by category.” migrainedisorders.org
29. The Migraine Trust. “Migraine and diet.” migrainetrust.org
30. ASCIA. “Food protein-induced enterocolitis syndrome (FPIES).” allergy.org.au
31. International FPIES Association survey, “A slice of FPIES”. Journal of Allergy and Clinical Immunology: In Practice, 2020. PMC
32. Review of medium-chain triglycerides. Frontiers in Nutrition, 2021. PMC
33. Malibu. “Malibu Original”, product page and FAQ. malibudrinks.com
34. European Commission. “Alcohol labelling.” food.ec.europa.eu
35. US Alcohol and Tobacco Tax and Trade Bureau. “Major food allergen labeling.” ttb.gov
36. Philippines, Bureau of Agriculture and Fisheries Standards. Draft national standard, code of hygienic practice for coconut sap sugar, 2015. PDF
37. Nutiva (Coconut Secret). “The Original Coconut Aminos”, ingredients. nutiva.com
38. COSMILE Europe. “Coconut alkanes.” cosmileeurope.eu
39. COSMILE Europe. “Coconut acid.” cosmileeurope.eu
40. COSMILE Europe. “Cocamide DEA.” cosmileeurope.eu
41. Chowdhury I. et al. Study of palm pollens as aeroallergens in eastern India. Clinical & Experimental Allergy, 1998; 28(8): 977–983. PubMed
42. Karmakar P.R., Das A., Chatterjee B.P. “Placebo-controlled immunotherapy with Cocos nucifera pollen extract.” International Archives of Allergy and Immunology, 1994; 103(2): 194–201. PubMed
43. Uragoda C.G. Clinical study of coir workers. British Journal of Industrial Medicine, 1975; 32(1): 66–71. PubMed
44. Panicker V., Karunakaran R., Ravindran C. “Nasobronchial allergy and pulmonary function abnormalities among coir workers of Alappuzha.” Journal of the Association of Physicians of India, 2010; 58: 420–422. PubMed
45. Merck Veterinary Manual. “Cutaneous food allergy in animals.” merckvetmanual.com
46. ASPCA Animal Poison Control. “People foods to avoid feeding your pets.” aspca.org
47. American Kennel Club. “Coconut oil for dogs.” akc.org

Educational only, not medical advice. Always confirm with your allergist.