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v1.0.0
ICD-10 Guide
ICD-10 CodesZ28.20

Z28.20

Immunization not carried out because of patient decision for unspecified reason

BILLABLE STATUSYes
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED09/12/2025

Code Description

ICD-10 Z28.20 is a billable code used to indicate a diagnosis of immunization not carried out because of patient decision for unspecified reason.

Key Diagnostic Point:

Z28.20 is used when a patient decides not to receive an immunization for reasons that are not specified. This decision can be influenced by various factors, including personal beliefs, cultural influences, misinformation, or fear of side effects. Understanding the social determinants of health is crucial, as these factors can significantly impact a patient's decision-making process regarding vaccinations. Preventive care is essential in public health, and immunizations play a critical role in preventing disease outbreaks. Coders must recognize that the patient's decision may stem from a lack of access to healthcare services, education, or support systems. Accurate documentation of the patient's decision and the context surrounding it is vital for appropriate coding and for understanding the broader implications on community health.

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Variability in patient decision-making reasons
  • Need for thorough documentation of patient interactions
  • Potential for misinterpretation of patient intent
  • Influence of social determinants on health decisions

Audit Risk Factors

  • Inadequate documentation of patient reasons for refusal
  • Failure to capture relevant social determinants of health
  • Misuse of the code in cases where immunization was contraindicated
  • Inconsistent coding practices across providers

Specialty Focus

Medical Specialties

Primary Care

Documentation Requirements

Document patient discussions regarding immunization, including reasons for refusal and any educational efforts made.

Common Clinical Scenarios

Routine checkups where immunizations are recommended but declined by the patient.

Billing Considerations

Consideration of cultural beliefs and access to information that may influence patient decisions.

Public Health

Documentation Requirements

Collect data on immunization rates and reasons for refusal to inform public health strategies.

Common Clinical Scenarios

Community health initiatives aimed at increasing vaccination rates.

Billing Considerations

Focus on population health trends and the impact of social determinants on vaccination uptake.

Coding Guidelines

Inclusion Criteria

Use Z28.20 When
  • Z codes are used to indicate reasons for encounters that are not primarily disease
  • related
  • 20 should be sequenced appropriately, typically following any primary diagnosis codes
  • Payer requirements may vary, so it is essential to check specific guidelines for coverage of preventive services

Exclusion Criteria

Do NOT use Z28.20 When
No specific exclusions found.

Related CPT Codes

90460CPT Code

Immunization administration

Clinical Scenario

Used when immunizations are administered, but may also be linked to Z28.20 if the patient refuses.

Documentation Requirements

Document the immunization recommendation and the patient's refusal.

Specialty Considerations

Primary care providers should ensure they address patient concerns during immunization discussions.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The transition to ICD-10 has allowed for greater specificity in coding patient decisions regarding immunizations, enabling better tracking of vaccination trends and patient education needs.

ICD-9 vs ICD-10

The transition to ICD-10 has allowed for greater specificity in coding patient decisions regarding immunizations, enabling better tracking of vaccination trends and patient education needs.

Reimbursement & Billing Impact

The transition to ICD-10 has allowed for greater specificity in coding patient decisions regarding immunizations, enabling better tracking of vaccination trends and patient education needs.

Resources

Clinical References

  • •
    CDC Immunization Guidelines

Coding & Billing References

  • •
    CDC Immunization Guidelines

Frequently Asked Questions

What should I document when a patient refuses an immunization?

Document the patient's reasons for refusal, any educational efforts made, and the context of the decision. This information is crucial for accurate coding and understanding patient behavior.