ICD10 code of Food Protein-Induced Enterocolitis Syndrome and ICD9 code

Food Protein-Induced Enterocolitis Syndrome (FPIES) does not have a unique, dedicated code in the ICD-9-CM or ICD-10-CM classification systems. Clinicians typically use broader codes such as ICD-10 K52.22 (Food protein-induced enterocolitis syndrome) or ICD-9 558.3 (Allergic gastroenteritis and colitis) to document the condition for medical billing and records.

What is the clinical significance of FPIES coding?

Because Food Protein-Induced Enterocolitis Syndrome is a non-IgE-mediated gastrointestinal food allergy, it lacks a singular, specific diagnostic code in older systems. The adoption of ICD-10 K52.22 has been a significant step forward for the Food Protein-Induced Enterocolitis Syndrome community, allowing physicians to better track cases and ensure appropriate insurance coverage for diagnostic procedures and specialized amino acid-based formulas.

How is Food Protein-Induced Enterocolitis Syndrome diagnosed?

Diagnosis of Food Protein-Induced Enterocolitis Syndrome is primarily clinical, based on a history of repetitive, profuse vomiting and lethargy occurring 1–4 hours after ingestion of a specific trigger food. There are no specific blood tests or skin prick tests that confirm Food Protein-Induced Enterocolitis Syndrome, as it is a cell-mediated (delayed) reaction. Diagnosis often includes:

• Review of symptom onset timing relative to food intake.


• Resolution of symptoms when the culprit protein is removed from the diet.


• In some cases, a medically supervised oral food challenge (OFC) in a hospital setting.


• Ruling out sepsis or metabolic disorders which can mimic the severe presentation of Food Protein-Induced Enterocolitis Syndrome.

Is there support for those living with the condition?

Living with Food Protein-Induced Enterocolitis Syndrome can be overwhelming, especially for parents managing severe dietary restrictions. At DiseaseMaps.org, we currently have 2 community members who have shared their experiences with the condition. Connecting with others who understand the vigilance required to manage Food Protein-Induced Enterocolitis Syndrome can provide much-needed emotional support and practical coping strategies.

Next steps

• Consult with a board-certified pediatric allergist or gastroenterologist to establish a formal emergency action plan.


• Request a referral to a registered dietitian who specializes in pediatric food allergies.


• Join patient support groups to share resources and experiences with other families.


• Keep a detailed food and symptom diary to help your medical team identify specific triggers.

Medical disclaimer: This information is for educational purposes only and does not constitute professional medical advice, diagnosis, or treatment.

References

• NIH Genetic and Rare Diseases Information Center (GARD): Food Protein-Induced Enterocolitis Syndrome.


• Orphanet: Food protein-induced enterocolitis syndrome (ORPHA:369846).


• The International FPIES Association (I-FPIES): Clinical guidelines and resources.


• World Allergy Organization (WAO): Diagnosis and management of FPIES.