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ICD-10 Guide
ICD-10 CodesK52.21

K52.21

Billable

Food protein-induced enterocolitis syndrome

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/06/2025

Code Description

ICD-10 K52.21 is a billable code used to indicate a diagnosis of food protein-induced enterocolitis syndrome.

Key Diagnostic Point:

Food protein-induced enterocolitis syndrome (FPIES) is a non-IgE-mediated gastrointestinal allergy primarily affecting infants and young children. Clinically, it presents with severe vomiting, diarrhea, and dehydration, typically occurring within hours after ingestion of specific food proteins, such as cow's milk or soy. The anatomy involved includes the small intestine and colon, where inflammation and damage occur due to the immune response to the offending proteins. Disease progression can lead to chronic gastrointestinal symptoms, malnutrition, and failure to thrive if not identified and managed appropriately. Diagnostic considerations include a thorough clinical history, elimination diets, and oral food challenges under medical supervision to confirm the specific food triggers. Laboratory tests may show signs of inflammation, but specific IgE tests are usually negative, distinguishing FPIES from other allergic conditions. Early recognition and management are crucial to prevent severe complications and ensure proper growth and development in affected children.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Diagnostic complexity: Requires careful differentiation from other gastrointestinal disorders and allergies.
  • Treatment complexity: Involves dietary management and potential emergency interventions for acute reactions.
  • Documentation requirements: Detailed clinical history and response to dietary changes must be documented.
  • Coding specificity: Requires accurate identification of the specific food triggers and symptoms.

Audit Risk Factors

  • Common coding errors: Misclassification with other gastrointestinal disorders.
  • Documentation gaps: Incomplete records of dietary history and reactions.
  • Billing challenges: Potential denials if the diagnosis is not well-supported by clinical documentation.

Specialty Focus

Medical Specialties

Pediatrics

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Allergy and Immunology

Documentation Requirements

Standard ICD-10-CM documentation requirements apply

Common Clinical Scenarios

Various clinical presentations within this specialty area

Billing Considerations

Follow specialty-specific billing guidelines

Related ICD-10 Codes

Related CPT Codes

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

CPT Code

Clinical Scenario

Documentation Requirements

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

FPIES has significant clinical implications, particularly in pediatric populations, as it can lead to malnutrition and developmental delays if not managed effectively. The condition is relatively rare, but awareness among healthcare providers is crucial for early diagnosis and intervention. Population health impact includes the need for increased monitoring of affected children to ensure proper dietary management and growth. Quality measures may focus on the timely identification of food allergies and the effectiveness of dietary interventions, influencing healthcare utilization patterns and resource allocation.

ICD-9 vs ICD-10

FPIES has significant clinical implications, particularly in pediatric populations, as it can lead to malnutrition and developmental delays if not managed effectively. The condition is relatively rare, but awareness among healthcare providers is crucial for early diagnosis and intervention. Population health impact includes the need for increased monitoring of affected children to ensure proper dietary management and growth. Quality measures may focus on the timely identification of food allergies and the effectiveness of dietary interventions, influencing healthcare utilization patterns and resource allocation.

Reimbursement & Billing Impact

Reimbursement may be affected by the completeness of documentation, particularly if the diagnosis is questioned by payers. Common denials can occur if the clinical rationale for the diagnosis is not clearly articulated. Best practices include maintaining thorough records of patient encounters and ensuring that all relevant clinical information is included in billing submissions.

Resources

Clinical References

  • •
    ICD-10 Official Guidelines for K00-K99
  • •
    Clinical Documentation Requirements

Coding & Billing References

  • •
    ICD-10 Official Guidelines for K00-K99
  • •
    Clinical Documentation Requirements

Frequently Asked Questions

What specific conditions are covered by K52.21?

K52.21 specifically covers food protein-induced enterocolitis syndrome, characterized by gastrointestinal symptoms triggered by specific food proteins, primarily in infants and young children.

When should K52.21 be used instead of related codes?

K52.21 should be used when the clinical presentation aligns with FPIES, particularly when symptoms arise after ingestion of specific food proteins, and other causes of enterocolitis have been ruled out.

What documentation supports K52.21?

Documentation should include a detailed clinical history of symptoms following food intake, results from elimination diets, and any oral food challenge outcomes, along with a record of the patient's growth and nutritional status.