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ICD-10 Guide
ICD-10 CodesChapter 3: Diseases of the blood and blood-forming organsD89

D89

Billable

Other disorders involving the immune mechanism, not elsewhere classified

Chapter 3:Diseases of the blood and blood-forming organs

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

Code Description

ICD-10 D89 is a billable code used to indicate a diagnosis of other disorders involving the immune mechanism, not elsewhere classified.

Key Diagnostic Point:

ICD-10 code D89 encompasses a variety of disorders that involve the immune system but do not fit neatly into other specific categories. These disorders may include atypical immune responses, autoimmune conditions that are not classified under more specific autoimmune diseases, and other immune-related disorders that affect blood and blood-forming organs. Conditions such as hypersensitivity reactions, immune deficiencies, and certain hematologic disorders may fall under this code. The clinical presentation can vary widely, including symptoms such as fatigue, recurrent infections, and hematological abnormalities. Accurate diagnosis often requires a comprehensive evaluation, including laboratory tests to assess immune function and blood parameters. Given the complexity of the immune system, these disorders can be challenging to diagnose and manage, necessitating a multidisciplinary approach to treatment and care.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variety of conditions that can be classified under this code
  • Need for comprehensive clinical documentation
  • Potential overlap with other immune-related codes
  • Variability in clinical presentation and laboratory findings

Audit Risk Factors

  • Insufficient documentation of the immune disorder
  • Inconsistent use of related codes
  • Lack of clarity in clinical notes regarding the diagnosis
  • Failure to document the rationale for using D89

Specialty Focus

Medical Specialties

Hematology

Documentation Requirements

Detailed lab results, patient history, and treatment plans.

Common Clinical Scenarios

Patients presenting with unexplained anemia, thrombocytopenia, or recurrent infections.

Billing Considerations

Ensure that all hematological parameters are documented to support the diagnosis.

Immunology

Documentation Requirements

Comprehensive immune profiling and history of autoimmune conditions.

Common Clinical Scenarios

Patients with suspected autoimmune disorders or unexplained immune dysfunction.

Billing Considerations

Document all relevant tests and their interpretations to justify the use of D89.

Coding Guidelines

Inclusion Criteria

Use D89 When
  • According to ICD
  • 10 guidelines, D89 should be used when the specific immune disorder is not classified elsewhere
  • Coders must ensure that the documentation supports the diagnosis and that other more specific codes are not applicable

Exclusion Criteria

Do NOT use D89 When
No specific exclusions found.

Related CPT Codes

85025CPT Code

Complete blood count (CBC) with differential

Clinical Scenario

Used to evaluate hematological parameters in patients suspected of having immune disorders.

Documentation Requirements

Document the reason for the CBC and any relevant clinical findings.

Specialty Considerations

Hematologists should ensure that all relevant lab results are included in the patient's record.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for more specific coding of immune disorders, but D89 remains a catch-all for conditions that do not fit elsewhere. Coders must be vigilant in ensuring that documentation supports the use of this code to avoid denials and audits.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for more specific coding of immune disorders, but D89 remains a catch-all for conditions that do not fit elsewhere. Coders must be vigilant in ensuring that documentation supports the use of this code to avoid denials and audits.

Reimbursement & Billing Impact

reimbursement.

Resources

Clinical References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Coding & Billing References

  • •
    ICD-10-CM Official Guidelines for Coding and Reporting

Frequently Asked Questions

What types of conditions are classified under D89?

D89 includes a variety of immune-related disorders that do not fit into more specific categories, such as atypical immune responses, autoimmune conditions not otherwise classified, and certain hematologic disorders.

How can I ensure accurate coding for D89?

Accurate coding for D89 requires thorough documentation of the patient's clinical presentation, lab results, and any treatments provided. Always check for more specific codes that may apply.