ICD-10 Logo
ICDxICD-10 Medical Coding
ICD-10 Logo
ICDxICD-10 Medical Coding
ICD 10 CodesDiagnoses
ICD 10 CodesDiagnoses
ICD-10 Logo
ICDxICD-10 Medical Coding

Comprehensive ICD-10-CM code reference with AI-powered search capabilities.

© 2025 ICD Code Compass. All rights reserved.

Browse

  • All Chapters
  • All Categories
  • Diagnoses

Tools

  • AI Code Search
ICD-10-CM codes are maintained by the CDC and CMS. This tool is for reference purposes only.
v1.0.0
ICD-10 Guide
ICD-10 CodesA28

A28

Other specified zoonotic bacterial diseases

BILLABLE STATUSNo
IMPLEMENTATION DATEOctober 1, 2015
LAST UPDATED08/28/2025

Code Description

ICD-10 A28 is a used to indicate a diagnosis of other specified zoonotic bacterial diseases.

Key Diagnostic Point:

Q fever

  • Q fever

Code Complexity Analysis

Complexity Rating: Medium

Medium Complexity

Complexity Factors

  • Standard complexity factors

Audit Risk Factors

  • Standard audit considerations

Specialty Focus

Coding Guidelines

Inclusion Criteria

Use A28 When
  • The ICD
  • 10 Code A28 (Non
  • billable) is a 'header code' in the International Classification of Diseases, Tenth Revision (ICD
  • This code typically refers to categories such as "Other zoonotic bacterial diseases, not elsewhere classified"
  • However, you cannot use the A28 as a standalone diagnosis, as it falls under the 'header' category
  • You need to choose a code from the series available beneath it (A28
  • 9) for coding purposes
  • 10 A28 Coding Guidelines:

Exclusion Criteria

Do NOT use A28 When
  • Inclusion/Exclusion Criteria: The ICD
  • 10 coding rules stipulate that certain conditions are included or excluded in a particular code

Related Codes

Child Codes

5 codes
A28.0
Lymphadenitis, acute, primary
A28.1
Cat-scratch disease
A28.2
Disseminated histoplasmosis
A28.8
Other specified zoonotic bacterial diseases
A28.9
Other specified zoonotic bacterial diseases, unspecified.

Related CPT Codes

No CPT Codes Available

Related CPT codes for this diagnosis will be displayed here when available.

ICD-10 Impact

Diagnostic & Documentation Impact

Enhanced Specificity

ICD-10 Improvements

The International Classification of Diseases, 10th Edition (ICD-10) introduced significant changes to medical coding, including the non-billable code A28.
Specificity: ICD-10 offers a more comprehensive and specific coding system compared to its predecessor, ICD-9. If A28 is considered non-billable, it may mean that it is not specific enough to be used as a code for billing purposes. Under ICD-10, more specific codes may exist that require coders to use additional digits or details, such as the type of organism causing the disease, the location of the disease, or its severity.
Reimbursement: The move to ICD-10 has an impact on the reimbursement process. Use of non-billable codes like A28 may result in claims denials as they are not appropriate for reimbursement purposes. Therefore, the use of more accurate, specific codes becomes important to ensure proper claim submission and potentially, a higher reimbursement rate.

ICD-9 vs ICD-10

The International Classification of Diseases, 10th Edition (ICD-10) introduced significant changes to medical coding, including the non-billable code A28. Specificity: ICD-10 offers a more comprehensive and specific coding system compared to its predecessor, ICD-9. If A28 is considered non-billable, it may mean that it is not specific enough to be used as a code for billing purposes. Under ICD-10, more specific codes may exist that require coders to use additional digits or details, such as the type of organism causing the disease, the location of the disease, or its severity. Reimbursement: The move to ICD-10 has an impact on the reimbursement process. Use of non-billable codes like A28 may result in claims denials as they are not appropriate for reimbursement purposes. Therefore, the use of more accurate, specific codes becomes important to ensure proper claim submission and potentially, a higher reimbursement rate. Documentation: ICD-10 requires more detailed and comprehensive documentation....

Reimbursement & Billing Impact

billing purposes. Under ICD-10, more specific codes may exist that require coders to use additional digits or details, such as the type of organism causing the disease, the location of the disease, or its severity.

Resources

Clinical References

No clinical reference resources available for this code.

Coding & Billing References

No coding and billing reference resources available for this code.

Frequently Asked Questions

What does the ICD-10 code A28 represent?

A: ICD-10 code A28 is a non-billable code, which typically serves as a header, and it includes subcategories of more specific, billable codes. The A28 code is commonly used to denote "Other zoonotic bacterial diseases, not elsewhere classified".

Why is code A28 considered non-billable?

A: A28 as a non-billable or "header" code means it is not sufficient for claim submissions. It’s used in the ICD-10 code structure to represent a group or category of related conditions, but it can't stand alone for billing purposes. We need to drill down to a more specific code, a billable one with more digits, within the A28 category.

Can I use code A28 for billing?

A: No, you cannot use the A28 code for billing directly. It is a non-billable code and it will need to be broken down into a more specific, billable code for claim submission.

How do I find the specific, billable code under A28?

A: You will need to refer to the ICD-10-CM Official Guidelines for Coding and Reporting to search for more specific or billable subcodes under A28. This can usually be done using ICD-10 coding software or consulting with a professional medical coder.

Can a healthcare provider use code A28 for documentation?

A: Yes, healthcare providers can use non-billable codes like A28 for documentation and statistical tracking purposes. However, these codes should be further specified when it comes to billing and reporting.

How does ICD-10 code A28 relate to other codes?

A: Code A28 is a hierarchical code that categorizes certain diseases, hence its subcodes directly relates to it, specifically describing the diseases under this group. Nonetheless, each of these more detailed subcodes can independently relate to other codes representing symptoms, complications, or conditions stemming from the disease in the billing process.