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ICD-10 Coding for Erythema Nodosum(L52, A18.4)

Complete ICD-10-CM coding and documentation guide for Erythema Nodosum. Includes clinical validation requirements, documentation requirements, and coding pitfalls.

Also known as:

ENNodular Erythema

Related ICD-10 Code Ranges

Complete code families applicable to Erythema Nodosum

L00-L99Primary Range

Diseases of the skin and subcutaneous tissue

This range includes conditions affecting the skin, including erythema nodosum.

Certain infectious and parasitic diseases

Includes infectious causes of erythema nodosum, such as tuberculous erythema nodosum.

Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

CodeDescriptionWhen to UseKey Documentation
L52Erythema nodosumUse when erythema nodosum is confirmed and not related to tuberculosis.
  • Biopsy showing septal panniculitis
  • Clinical presentation of tender, erythematous nodules
A18.4Tuberculous erythema nodosumUse when erythema nodosum is confirmed to be due to tuberculosis.
  • Positive TB culture or IGRA
  • Biopsy showing granulomas with caseous necrosis

Clinical Decision Support

Always review the patient's clinical documentation thoroughly. When in doubt, choose the more specific code and ensure documentation supports it.

Key Information: ICD-10 code for erythema nodosum

Essential facts and insights about Erythema Nodosum

Erythema nodosum is coded as L52 in ICD-10, with A18.4 used for tuberculosis-related cases.

Primary ICD-10-CM Codes for erythema nodosum

Erythema nodosum
Billable Code

Decision Criteria

clinical Criteria

  • Presence of tender, erythematous nodules on shins

coding Criteria

  • Exclude tuberculosis as a cause

Applicable To

  • Idiopathic erythema nodosum
  • Drug-induced erythema nodosum

Excludes

  • Tuberculous erythema nodosum (A18.4)

Clinical Validation Requirements

  • Biopsy showing septal panniculitis
  • Clinical presentation of tender, erythematous nodules

Code-Specific Risks

  • Incorrectly coding when related to tuberculosis

Coding Notes

  • Ensure to document any underlying conditions or triggers.

Ancillary Codes

Additional codes that should be used in conjunction with the main diagnosis codes when applicable.

Sarcoidosis, unspecified

D86.9
Use when erythema nodosum is secondary to sarcoidosis.

Differential Codes

Alternative codes to consider when ruling out similar conditions to the primary diagnosis.

Tuberculous erythema nodosum

A18.4
Use when erythema nodosum is confirmed to be due to tuberculosis.

Erythema nodosum

L52
Use when not related to tuberculosis.

Documentation & Coding Risks

Avoid these common documentation and coding issues when documenting Erythema Nodosum to ensure proper reimbursement, maintain compliance, and reduce audit risk. These guidelines are particularly important when using ICD-10 code L52.

Impact

Clinical: Inaccurate treatment planning, Regulatory: Non-compliance with coding standards, Financial: Potential claim denials

Mitigation Strategy

Thorough patient history, Comprehensive diagnostic testing

Impact

Reimbursement: Incorrect coding can lead to denied claims., Compliance: Non-compliance with ICD-10 coding guidelines., Data Quality: Inaccurate health records and statistics.

Mitigation Strategy

Use A18.4 when tuberculosis is the confirmed cause.

Impact

Failure to code underlying conditions first.

Mitigation Strategy

Implement coding audits and training.

Documentation errors, coding pitfalls, and audit risks are interconnected aspects of medical coding and billing. Addressing all three areas helps ensure accurate coding, optimal reimbursement, and regulatory compliance.

Frequently Asked Questions

Common questions about ICD-10 coding for Erythema Nodosum, with expert answers to help guide accurate code selection and documentation.

Documentation Templates for Erythema Nodosum

Use these documentation templates to ensure complete and accurate documentation for Erythema Nodosum. These templates include all required elements for proper coding and billing.

Erythema nodosum with underlying sarcoidosis

Specialty: Rheumatology

Required Elements

  • Lesion characteristics
  • Associated symptoms
  • Test results

Example Documentation

34F with 10-day history of painful shin nodules. 8 erythematous subcutaneous nodules on bilateral lower extremities. C-reactive protein 28 mg/L. Assessment: Erythema nodosum, likely secondary to newly diagnosed Crohn's disease.

Examples: Poor vs. Good Documentation

Poor Documentation Example
Rash on legs
Good Documentation Example
Acute EN with 6 tender nodules; negative TB workup; started oral prednisone 40mg daily
Explanation
The good example provides specific lesion details and treatment plan.

Need help with ICD-10 coding for Erythema Nodosum? Ask your questions below.

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