ICD-10-CM Code M66.171

Rupture of synovium, right ankle

Version 2020 Billable Code

Valid for Submission

M66.171 is a billable code used to specify a medical diagnosis of rupture of synovium, right ankle. The code is valid for the year 2020 for the submission of HIPAA-covered transactions.

ICD-10:M66.171
Short Description:Rupture of synovium, right ankle
Long Description:Rupture of synovium, right ankle

Diagnostic Related Groups

The ICD-10 code M66.171 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC).
applicable from 10/01/2019 through 09/30/2020.

  • 557 - TENDONITIS, MYOSITIS AND BURSITIS WITH MCC
  • 558 - TENDONITIS, MYOSITIS AND BURSITIS WITHOUT MCC

Convert M66.171 to ICD-9

  • 727.59 - Rupture of synovium NEC (Approximate Flag)

Code Classification

  • Diseases of the musculoskeletal system and connective tissue (M00–M99)
    • Disorders of synovium and tendon (M65-M67)
      • Spontaneous rupture of synovium and tendon (M66)

Code History

  • FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
    (First year ICD-10-CM implemented into the HIPAA code set)
  • FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
  • FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
  • FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
  • FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Information for Patients


Ankle Injuries and Disorders

Your ankle bone and the ends of your two lower leg bones make up the ankle joint. Your ligaments, which connect bones to one another, stabilize and support it. Your muscles and tendons move it.

The most common ankle problems are sprains and fractures. A sprain is an injury to the ligaments. It may take a few weeks to many months to heal completely. A fracture is a break in a bone. You can also injure other parts of the ankle such as tendons, which join muscles to bone, and cartilage, which cushions your joints. Ankle sprains and fractures are common sports injuries.


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