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v1.0.0
ICD-10 Guide
DiagnosesAutoimmune Disease

Autoimmune Disease

ICD-10 Coding for Autoimmune Disease(M32.9, D89.89)

PRIMARY SPECIALTYRheumatology
COMPLEXITYHigh
LAST UPDATED09/15/2025
Sam Tuffun, PT, DPT
Physical Therapist | Medical Coding & Billing Contributor

Diagnosis Overview

What is Autoimmune Disease?
Essential facts and insights about Autoimmune Disease

Key Clinical Considerations:

  • Fatigue, joint pain, and swelling
  • Positive antinuclear antibody (ANA) test, rheumatoid factor (RF), or anti-citrullinated protein antibodies (ACPA)
  • Joint tenderness, swelling, and decreased range of motion

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history, physical exam findings, and lab results
  • ICD-10-CM codes for specific autoimmune diseases
  • Examples include detailed descriptions of symptoms and diagnostic tests performed

Coding Guidelines

Usage Guidelines & Examples

  • Follow usage guidelines for specific autoimmune conditions to avoid miscoding.
  • Common errors include using general codes instead of specific autoimmune disease codes.

Code Exclusions

Important Exclusions

  • Conditions such as osteoarthritis or infectious arthritis.
  • Alternative codes may include those for related but distinct autoimmune conditions.

Related ICD-10 Codes

Primary Codes
M05.79
Other rheumatoid arthritis with rheumatoid factor
M32.9
Systemic lupus erythematosus, unspecified
M34.9
Systemic sclerosis, unspecified
Ancillary Codes
N08.5
Z79.899
Differential Codes
M35.9
D84.821

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Rheumatology

Specialty Applications

  • Patients with diagnosed autoimmune diseases, particularly in rheumatology clinics.
  • Clinical settings such as outpatient rheumatology practices and inpatient care.

Coding Complexity

High Complexity

This diagnosis requires careful attention to:

  • Comprehensive clinical documentation
  • Accurate code selection based on clinical criteria
  • Proper exclusion considerations
  • Specialty-specific coding guidelines

Documentation

Documentation Templates

Billing Information

Billing Considerations

  • Ensure proper documentation for billing
  • Verify code specificity requirements
  • Check for any additional codes needed
  • Review payer-specific guidelines

Common Issues

  • Insufficient clinical documentation
  • Incorrect code selection
  • Missing supporting diagnoses
  • Timing and frequency documentation

Frequently Asked Questions

What are the documentation requirements?

Include detailed patient history, physical exam findings, and lab results.

What are the billing considerations?

Ensure accurate coding based on specific autoimmune disease and associated symptoms.