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ICD-10 Guide
DiagnosesAnkle Tendonitis

Ankle Tendonitis

ICD-10 Coding for Ankle Tendonitis(M76.61, M76.62)

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

Diagnosis Overview

What is Ankle Tendonitis?
Essential facts and insights about Ankle Tendonitis

Key Clinical Considerations:

  • Pain and tenderness localized around the ankle, particularly along the tendon areas.
  • Swelling or inflammation in the ankle region, especially around the Achilles tendon or peroneal tendons.
  • Limited range of motion or stiffness in the ankle joint.
  • Imaging findings may include thickening of the tendon or signs of tendinopathy on ultrasound or MRI.
  • Severity can be classified based on the duration of symptoms (acute vs. chronic) and functional impairment.

Clinical Information

Clinical Criteria & Documentation Requirements

  • Document the patient's history of symptoms, including onset, duration, and exacerbating factors.
  • Use specific terminology such as 'tendinopathy', 'tendonitis', or 'tendon rupture' as applicable.
  • Examples include: 'Patient presents with pain in the lateral ankle consistent with peroneal tendonitis.'
  • Medical necessity must be established through documentation of functional limitations and treatment rationale.
  • Quality measures may include documentation of pain assessment and functional status.

Coding Guidelines

Usage Guidelines & Examples

  • Use M76.61 for unilateral Achilles tendonitis and M76.62 for bilateral cases.
  • Do not use these codes for conditions such as ankle sprains or fractures, as they are distinct diagnoses.
  • Similar codes include M76.60 (tendonitis, unspecified site) and M76.63 (peroneal tendonitis).
  • Common errors include misclassifying tendonitis as a sprain; ensure accurate assessment of the injury type.
  • In complex cases, consider the primary site of pain and any associated conditions to select the most accurate code.

Code Exclusions

Important Exclusions

  • Excludes conditions such as ankle sprains (S93.4) and fractures (S82, S83).
  • Alternative codes for excluded conditions include S93.41 for lateral ankle sprain.
  • Conditions are excluded due to differing pathophysiology and treatment approaches.
  • Avoid confusion with acute injuries; ensure clear documentation of chronicity.
  • Related but distinct conditions include Achilles tendon rupture (S86.01) and bursitis.

Related ICD-10 Codes

Primary Codes
M76.61
Achilles tendinitis, right leg
M76.62
Achilles tendinitis, left leg
Ancillary Codes
M25.571
M25.572
Differential Codes
S93.401A
S93.402A

Related CPT Codes

CPT codes will be available in a future update.

Specialty Focus

Primary Specialty

Podiatry

Specialty Applications

  • Applies to patients with chronic overuse injuries or acute tendon injuries.
  • Common in athletes, particularly runners and those involved in sports requiring jumping.
  • Clinical settings include outpatient physical therapy, sports medicine, and orthopedic clinics.
  • Podiatry specialists frequently manage this condition, along with orthopedic surgeons.
  • Treatment contexts include conservative management (rest, ice, physical therapy) and surgical interventions.

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 ankle tendonitis based on clinical findings of pain and swelling.'

Template 2

Template: 'Clinical presentation consistent with Achilles tendonitis including localized tenderness and limited range of motion.'

Template 3

Template: 'Diagnostic criteria for tendonitis met as evidenced by MRI findings of tendon thickening.'

Template 4

Template: 'Treatment plan initiated for ankle tendonitis with physical therapy and anti-inflammatory medications.'

Template 5

Template: 'Follow-up care for ankle tendonitis including monitoring of pain levels and functional improvement.'

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?

Detailed documentation of symptoms, physical exam findings, and treatment plan.

How does this differ from similar diagnoses?

Differentiation is based on specific tendon involvement and symptomatology.

What are common billing considerations?

Ensure accurate coding to reflect the specific tendon involved for optimal reimbursement.

What procedures are typically associated?

CPT codes for physical therapy, ultrasound-guided injections, or surgical repair may apply.

Are there any quality reporting implications?

Quality measures may include tracking functional outcomes and pain management effectiveness.