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ICD-10 Guide
ICD-10 CodesE31.21

E31.21

Billable

Multiple endocrine neoplasia [MEN] type I

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/05/2025

Code Description

ICD-10 E31.21 is a billable code used to indicate a diagnosis of multiple endocrine neoplasia [men] type i.

Key Diagnostic Point:

Multiple endocrine neoplasia type I (MEN I), also known as Wermer's syndrome, is a hereditary condition characterized by the development of tumors in multiple endocrine glands. The most commonly affected glands include the parathyroid glands, pancreas, and pituitary gland. Patients with MEN I often present with hyperparathyroidism, which can lead to hypercalcemia and associated complications such as kidney stones and osteoporosis. Pancreatic endocrine tumors may cause insulinomas or gastrinomas, leading to hypoglycemia or Zollinger-Ellison syndrome, respectively. Pituitary tumors can result in hormonal imbalances, affecting growth and metabolism. The condition is associated with genetic mutations, primarily in the MEN1 gene, and typically manifests in adulthood, although some symptoms may arise during puberty. Due to the polyglandular nature of the disorder, patients may experience a range of symptoms related to hormonal dysfunction, including growth abnormalities and thymus disorders. Early diagnosis and management are crucial to prevent complications and improve quality of life.

Code Complexity Analysis

Complexity Rating: High

High Complexity

Complexity Factors

  • Requires understanding of genetic implications and family history.
  • Involves multiple organ systems and associated symptoms.
  • Differentiation from other endocrine disorders is necessary.
  • Documentation must include specific tumor types and locations.

Audit Risk Factors

  • Inadequate documentation of family history and genetic testing.
  • Failure to specify the type of endocrine tumors present.
  • Misclassification of symptoms related to other endocrine disorders.
  • Lack of clarity in the documentation of treatment plans.

Specialty Focus

Medical Specialties

Endocrinology

Documentation Requirements

Detailed documentation of hormonal levels, imaging studies, and tumor types.

Common Clinical Scenarios

Patients presenting with hypercalcemia, insulinomas, or pituitary adenomas.

Billing Considerations

Ensure comprehensive documentation of all endocrine glands involved.

Genetics

Documentation Requirements

Family history, genetic testing results, and counseling notes.

Common Clinical Scenarios

Patients with a family history of MEN I or related endocrine tumors.

Billing Considerations

Document genetic counseling and testing to support diagnosis.

Coding Guidelines

Inclusion Criteria

Use E31.21 When
  • Follow the official ICD
  • CM coding guidelines for neoplasms, ensuring accurate documentation of the type and location of tumors
  • Include any relevant family history and genetic testing results to support the diagnosis

Exclusion Criteria

Do NOT use E31.21 When
No specific exclusions found.

Related ICD-10 Codes

Related CPT Codes

88305CPT Code

Pathology examination of tissue

Clinical Scenario

Used when tumor biopsies are taken for diagnosis.

Documentation Requirements

Pathology reports must be included.

Specialty Considerations

Endocrinologists and pathologists must collaborate on documentation.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of MEN I, improving the ability to capture the complexity of the condition and its associated symptoms. This specificity aids in better tracking of patient outcomes and resource allocation.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of MEN I, improving the ability to capture the complexity of the condition and its associated symptoms. This specificity aids in better tracking of patient outcomes and resource allocation.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for more specific coding of MEN I, improving the ability to capture the complexity of the condition and its associated symptoms. This specificity aids in better tracking of patient outcomes and resource allocation.

Resources

Clinical References

  • •
    National Institutes of Health - MEN I

Coding & Billing References

  • •
    National Institutes of Health - MEN I

Frequently Asked Questions

What are the common symptoms of MEN I?

Common symptoms include hypercalcemia, recurrent kidney stones, hypoglycemia, and hormonal imbalances due to pituitary tumors.