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ICD-10 Guide
DiagnosesIncreased C Reactive Protein

Increased C Reactive Protein

ICD-10 Coding for Increased C-Reactive Protein(R79.82)

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

Diagnosis Overview

What is Increased C Reactive Protein?
Essential facts and insights about Increased C-Reactive Protein

Key Clinical Considerations:

  • Elevated levels of C-reactive protein (CRP) in blood tests
  • Symptoms of inflammation such as joint pain, swelling, and stiffness
  • Presence of autoimmune disorders or infections

Clinical Information

Clinical Criteria & Documentation Requirements

  • Patient history of inflammatory conditions
  • Results of CRP tests and any related inflammatory markers
  • Physical examination findings indicating inflammation or joint issues

Coding Guidelines

Usage Guidelines & Examples

  • Use R65.1 for systemic inflammatory response; avoid using it for infections.
  • Common errors include misclassifying CRP elevation as solely infectious without considering autoimmune causes.

Code Exclusions

Important Exclusions

  • Acute infections that may cause CRP elevation.
  • Alternative codes for specific autoimmune diseases like lupus or psoriatic arthritis.

Related ICD-10 Codes

Primary Codes
R65.1
Systemic inflammatory response syndrome (SIRS) due to non-infectious process
M06.9
Rheumatoid arthritis, unspecified
Ancillary Codes
M05.79
Differential Codes
Z13.6
Z13.6
for hs-CRP tests related to cardiovascular risk assessment.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Rheumatology

Specialty Applications

  • Patients with autoimmune diseases, chronic inflammatory conditions, or infections.
  • Rheumatology clinics, primary care settings, and emergency departments.

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

Documentation requirements?

Include CRP test results, patient symptoms, and relevant medical history.

Billing considerations?

Ensure accurate coding of underlying conditions and proper justification for CRP testing.