ICD-10-CM Diagnosis Code M79.12 - Myalgia of auxiliary muscles, head and neck (original) (raw)

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ICD List 2025-2026 Edition

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  6. 2026 ICD-10-CM Code M79.12

Myalgia of auxiliary muscles, head and neck

ICD-10-CM Code:

M79.12

ICD-10 Code for:

Myalgia of auxiliary muscles, head and neck

Is Billable?

Yes - Valid for Submission

Chronic Condition Indicator: [1]

Not chronic

Code Navigator:

M79.12 is a billable diagnosis code used to specify a medical diagnosis of myalgia of auxiliary muscles, head and neck. The code is valid during the current fiscal year for the submission of HIPAA-covered transactions from October 01, 2025 through September 30, 2026.

  1. Code Information
  2. Clinical Classification
  3. Clinical Information
  4. Tabular List of Diseases and Injuries
  5. Index to Diseases and Injuries References
  7. Diagnostic Related Groups Mapping
  8. Replacement Code
  9. Patient Education
  10. Other Codes Used Similar Conditions
  11. Code History

Clinical Classifications group individual ICD-10-CM diagnosis codes into broader, clinically meaningful categories. These categories help simplify complex data by organizing related conditions under common clinical themes.

They are especially useful for data analysis, reporting, and clinical decision-making. Even when diagnosis codes differ, similar conditions can be grouped together based on their clinical relevance. Each category is assigned a unique CCSR code that represents a specific clinical concept, often tied to a body system or medical specialty.

CCSR Code: MUS010

Inpatient Default: Y - Yes, default inpatient assignment for principal diagnosis or first-listed diagnosis.

Outpatient Default: Y - Yes, default outpatient assignment for principal diagnosis or first-listed diagnosis.

painful sensation in the muscles.

damage to the muscle or its function secondary to toxic substances such as drugs used in chemotherapy; immunotherapy; or radiation.

an acute, febrile, infectious disease generally occurring in epidemics. it is usually caused by coxsackieviruses b and sometimes by coxsackieviruses a; echoviruses; or other enteroviruses.

The following annotation back-references for this diagnosis code are found in the injuries and diseases index. The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10-CM code(s).

References found for this diagnosis code in the External Cause of Injuries Index:

M7912 replaces the following previously assigned ICD-10-CM code(s):

Muscle Disorders

Your muscles help you move and help your body work. Different types of muscles have different jobs. There are many problems that can affect muscles. Muscle disorders can cause weakness, pain or even paralysis.

Causes of muscle disorders include:

Sometimes the cause of muscle disorders is unknown.

[Learn More in MedlinePlus]