AHA Coding Clinic® for ICD-10-CM and ICD-10-PCS - 2018 Issue 4; New/Revised ICD-10-CM Codes
Myalgia of Mastication and Auxiliary Muscles
New codes were created for myalgia of mastication muscle (M79.11); myalgia of auxiliary muscles, head and neck (M79.12); myalgia of unspecified site (M79.10); and myalgia of other sites (M79.18). Myalgia of the mastication and auxiliary muscles is the most common complaint of patients who present with temporomandibular dysfunction. There are four muscles of mastication – the masseter, temporalis, medial pterygoid and lateral pterygoid. These muscles of mastication are associated with movements of the jaw (temporomandibular joint). An estimated 60 -70% of presenting patients have some degree of myalgia, even if they also have a true...
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Article Overview
This article is about newly created ICD-10-CM diagnosis codes for different myalgia locations, with emphasis on mastication and auxiliary muscles in the head and neck. It is intended for coders, billers, and dental or medical practices that work with temporomandibular dysfunction and related pain complaints. The article provides a brief clinical overview and frames why location-specific documentation matters for selecting the appropriate diagnosis category.
Why This Topic Matters
Accurate identification of the pain location can affect how musculoskeletal complaints related to temporomandibular dysfunction are documented and categorized. The article helps readers understand the scope of the new diagnosis options and the clinical setting where they are commonly encountered.
What You Will Learn
- The clinical context for myalgia related to temporomandibular dysfunction
- How the article frames location-specific diagnosis categories
- Which broad muscle groups and pain locations are discussed in the new code family
- Why documentation of the pain site is important in this topic area
Who Should Read This
- Medical coders
- Billing staff
- Dental practices
- Medical practices
- Temporomandibular dysfunction specialists
Codes Discussed
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