Other bacterial diseases
ICD-10 Codes (135)
A31
A31.0
A31.1
A31.2
A31.8
A31.9
A32
A32.0
A32.1
A32.11
A32.12
A32.7
A32.8
A32.81
A32.82
A32.89
A32.9
A33
A34
A35
A36
A36.0
A36.1
A36.2
A36.3
A36.8
A36.81
A36.82
A36.83
A36.84
A36.85
A36.86
A36.89
A36.9
A37
A37.0
A37.00
A37.01
A37.1
A37.10
A37.11
A37.8
A37.80
A37.81
A37.9
A37.90
A37.91
A38
A38.0
A38.1
A38.8
A38.9
A39
A39.0
A39.1
A39.2
A39.3
A39.4
A39.5
A39.50
A39.51
A39.52
A39.53
A39.8
A39.81
A39.82
A39.83
A39.84
A39.89
A39.9
A40
A40.0
A40.1
A40.3
A40.8
A40.9
A41
A41.0
A41.01
A41.02
A41.1
A41.2
A41.3
A41.4
A41.5
A41.50
A41.51
A41.52
A41.53
A41.54
A41.59
A41.8
A41.81
A41.89
A41.9
A42
A42.0
A42.1
A42.2
A42.7
A42.8
A42.81
A42.82
A42.89
A42.9
A43
A43.0
A43.1
A43.8
A43.9
A44
A44.0
A44.1
A44.8
A44.9
A46
A48
A48.0
A48.1
A48.2
A48.3
A48.4
A48.5
A48.51
A48.52
A48.8
A49
A49.0
A49.01
A49.02
A49.1
A49.2
A49.3
A49.8
A49.9
Updates & Changes
FY 2026 Updates
New Codes (2)
Revised Codes (2)
Deleted Codes
No codes deleted in this range for FY 2026
Historical Changes
- •FY 2025: Routine maintenance updates with minor terminology clarifications
- •FY 2024: Enhanced specificity requirements for certain code ranges
- •FY 2023: Updated documentation guidelines for improved clarity
Upcoming Changes
- •Proposed updates pending review by Coordination and Maintenance Committee
- •Under consideration: Enhanced digital health integration codes
Implementation Guidance
- •Review all FY 2026 updates for A30-A49 codes before implementation
- •Always verify the most current codes in the ICD-10-CM manual
- •Ensure clinical documentation supports the selected diagnosis codes
- +3 more guidance items...
Range Overview
The ICD-10 code range A30-A49 pertains to 'Other bacterial diseases'. These codes are used to classify and document various bacterial infections not classified elsewhere. The range includes diseases like leprosy, diphtheria, whooping cough, and other nonvenereal treponemal infections. These codes are essential for accurate medical documentation and statistical analysis of disease prevalence.
Key Usage Points:
- •A30-A49 codes are used for bacterial diseases not classified elsewhere.
- •The codes are specific to the type of bacterial infection.
- •Codes can be used to track disease prevalence and treatment outcomes.
- •Accurate coding is essential for appropriate billing and reimbursement.
- •Some codes within this range may require additional codes to fully describe the condition.
Coding Guidelines
When to Use:
- ✓When a patient is diagnosed with a bacterial disease not classified elsewhere.
- ✓When a bacterial disease is the primary reason for a patient's visit.
- ✓When a bacterial disease is a comorbidity that affects patient care.
- ✓When documenting the history of a bacterial disease.
When NOT to Use:
- ✗When the bacterial disease is classified elsewhere.
- ✗When the patient is only at risk of the disease, without a confirmed diagnosis.
- ✗When the patient has a viral, fungal, or other non-bacterial infection.
- ✗When the bacterial disease is an incidental finding.
Code Exclusions
Always verify exclusions by cross-referencing the ICD-10 manual and any updates.
Documentation Requirements
Accurate documentation is crucial for correct coding. It should include the specific bacterial disease, its severity, any complications, and the patient's response to treatment.
Clinical Information:
- •Specific bacterial disease diagnosis
- •Severity of the disease
- •Any related complications
- •Response to treatment
Supporting Evidence:
- •Lab results confirming the bacterial infection
- •Clinical notes detailing the patient's symptoms and treatment plan
- •Imaging or other diagnostic test results if applicable
Good Documentation Example:
Patient diagnosed with diphtheria, severe, with myocarditis. Confirmed by throat culture. Responding well to antibiotics.
Poor Documentation Example:
Patient has a bacterial infection.
Common Documentation Errors:
- ⚠Not specifying the type of bacterial disease
- ⚠Failing to document the severity of the disease
- ⚠Not noting any related complications
- ⚠Not including supporting evidence
Range Statistics
Coding Complexity
The complexity of A30-A49 coding is considered medium due to the need for specificity in identifying the bacterial disease, understanding of disease severity, potential for complications requiring additional codes, and knowledge of code exclusions.
Key Factors:
- ▸Need to identify the specific bacterial disease
- ▸Requirement for additional codes for complications
- ▸Understanding of disease severity
- ▸Knowledge of code exclusions
Specialty Focus
These codes are most commonly used in infectious disease, internal medicine, and family practice specialties, but can be relevant in any setting where bacterial diseases are diagnosed.
Primary Specialties:
Clinical Scenarios:
- • A patient presenting with a severe cough and confirmed whooping cough diagnosis.
- • A patient with a history of leprosy requiring ongoing management.
- • A patient with diphtheria and related myocarditis.
- • A patient with a nonvenereal treponemal infection.
Resources & References
Resources for A30-A49 include the ICD-10 manual, official coding guidelines, and clinical reference materials.
Official Guidelines:
- ICD-10-CM Official Guidelines for Coding and Reporting
- American Health Information Management Association (AHIMA) guidelines
- Centers for Disease Control and Prevention (CDC) guidelines
Clinical References:
- UpToDate
- Medscape
Educational Materials:
- AHIMA ICD-10 training materials
- CDC ICD-10 educational resources
Frequently Asked Questions
Can A30-A49 codes be used for suspected bacterial diseases?
No, these codes should only be used for confirmed diagnoses. For suspected conditions, use the appropriate code from the R00-R99 range for symptoms, signs, and abnormal clinical and laboratory findings.