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v1.0.0
ICD-10 Guide
DiagnosesAcute Osteomyelitis

Acute Osteomyelitis

ICD-10 Coding for Acute Osteomyelitis(M86.0, M86.1)

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

Diagnosis Overview

What is Acute Osteomyelitis?
Essential facts and insights about Acute Osteomyelitis

Key Clinical Considerations:

  • Presence of localized bone pain, swelling, and tenderness.
  • Elevated inflammatory markers such as C-reactive protein (CRP) and erythrocyte sedimentation rate (ESR).
  • Physical examination may reveal warmth and erythema over the affected area.
  • Imaging studies (X-ray, MRI, or CT scan) may show bone destruction or abscess formation.
  • Severity can be assessed based on the extent of bone involvement and systemic symptoms.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Complete medical history including onset, duration, and progression of symptoms.
  • Specific terminology such as 'acute osteomyelitis' must be used in the documentation.
  • Examples include noting the site of infection and any surgical interventions performed.
  • Documentation must demonstrate medical necessity for imaging and laboratory tests.
  • Quality measures may include tracking infection resolution and functional outcomes.

Coding Guidelines

Usage Guidelines & Examples

  • Use M86.0 for acute osteomyelitis due to infectious agents and M86.1 for acute osteomyelitis due to other specified factors.
  • Do not use these codes for chronic osteomyelitis or other bone infections.
  • M86.0 and M86.1 are distinct from codes for septic arthritis or other musculoskeletal infections.
  • Common errors include misclassifying chronic conditions as acute; ensure accurate history is documented.
  • In complex cases, consider additional codes for underlying conditions or complications.

Code Exclusions

Important Exclusions

  • Chronic osteomyelitis (M86.2) is explicitly excluded from this diagnosis.
  • Alternative codes for chronic conditions should be used when applicable.
  • Conditions are excluded to ensure accurate representation of acute infections.
  • Common mistakes include using acute codes for chronic conditions; verify patient history.
  • Related but distinct conditions include osteitis and bone abscesses.

Related ICD-10 Codes

Primary Codes
M86.0
Acute osteomyelitis due to infectious agents
M86.1
Acute osteomyelitis due to other specified factors
Ancillary Codes
B95.61
B95.62
Differential Codes
M86.1
M86.1
for non-hematogenous acute osteomyelitis.
M86.0
M86.0
for hematogenous origin.

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Orthopedics

Specialty Applications

  • Applies to patients with acute infections of the bone, often post-trauma or surgery.
  • Patient populations include all ages, with higher risk in diabetics and immunocompromised individuals.
  • Clinical settings include inpatient for severe cases and outpatient for follow-up care.
  • Specialty-specific applications are primarily in orthopedics and infectious disease.
  • Treatment contexts include surgical intervention and antibiotic therapy.

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

Template 1

Template: 'Patient diagnosed with acute osteomyelitis based on clinical findings of localized pain and swelling.'

Template 2

Template: 'Clinical presentation consistent with acute osteomyelitis including fever and elevated ESR.'

Template 3

Template: 'Diagnostic criteria met as evidenced by MRI showing bone edema and abscess.'

Template 4

Template: 'Treatment plan initiated for acute osteomyelitis with IV antibiotics and surgical debridement.'

Template 5

Template: 'Follow-up care for acute osteomyelitis including monitoring of inflammatory markers and pain levels.'

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 documentation is required for this diagnosis?

Documentation must include clinical findings, imaging results, and treatment plans.

How does this differ from similar diagnoses?

Acute osteomyelitis is characterized by rapid onset and specific infectious causes, unlike chronic forms.

What are common billing considerations?

Ensure medical necessity is documented to support imaging and treatment claims.

What procedures are typically associated?

CPT codes for debridement, drainage, and imaging studies are commonly associated.

Are there any quality reporting implications?

Quality measures may include tracking infection resolution rates and patient outcomes.