2026 ICD-10-CM Diagnosis Code M79.10Myalgia, unspecified site

ICD-10-CM Codes›M00–M99›M70-M79›M79

ICD-10-CM M79.10
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M79.10 is a billable ICD-10-CM diagnosis code for myalgia, unspecified site. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 555 through 556. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Musculoskeletal pain, not low back pain.

Code Identity

ICD-10-CM Code
M79.10
Billable Status
Yes — Valid for Submission
Code Describes
Myalgia, unspecified site
Short Description
Myalgia, unspecified site
Same as the full description in the CMS dataset.
Parent Code
M79.1
Myalgia

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM70-M79Other soft tissue disorders
CategoryM79Other and unspecified soft tissue disorders, not elsewhere classified
This CodeM79.10Myalgia, unspecified site

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chronic musculoskeletal pain
  • Chronic musculoskeletal pain due to disease of nervous system
  • Chronic musculoskeletal pain due to disorder
  • Chronic musculoskeletal pain due to disorder of bone
  • Chronic musculoskeletal pain due to disorder of joint
  • Chronic musculoskeletal pain due to disorder of tendon
  • Chronic musculoskeletal pain due to persistent inflammation
  • Chronic primary musculoskeletal pain
  • Delayed onset muscle pain
  • Diffuse muscle tenderness
  • Exercise induced myalgia
  • Localized masticatory muscle soreness
  • Muscle pain
  • Muscle tension pain
  • Musculoskeletal pain
  • Musculoskeletal tenderness
  • Myalgia caused by statin
  • Myofascial pain
  • Myofascial pain with referral
  • Pain in multiple muscles
  • Pain on movement of skeletal muscle
  • Soreness
  • Tenalgia
  • Tenderness at muscle insertion
  • Tenderness of skeletal muscle
  • Viral myalgia

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Myalgia
    • Sore
      • muscle

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR MUS010
Musculoskeletal pain, not low back pain
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Musculoskeletal Pain

    discomfort stemming from muscles, ligaments, tendons, and bones.

  • Ligaments

    shiny, flexible bands of fibrous tissue connecting together articular extremities of bones. they are pliant, tough, and inextensile.

  • A Little Soreness Answer|A Little Soreness|A little soreness

    a response indicating that an individual has or had a little soreness.

  • Bothered by Sore Muscles Question|Bothered by Muscle Soreness|Bothered by Sore Muscles|Have you, during the past week, been bothered by sore muscles

    a question about whether an individual is or was bothered by sore muscles.

  • EORTC QLQ-ANL27 - Soreness in Areas Treated|EOR30-Soreness in Areas Treated|EOR30-Soreness in Areas Treated|EOR3037

    european organization for the research and treatment of cancer quality of life questionnaire - anal cancer 27 items (eortc qlq-anl27) during the past week: have you had soreness in the areas that have been treated?

  • EORTC QLQ-BR42 - Soreness in Mouth|EOR35-Soreness in Mouth|EOR35-Soreness in Mouth|EOR3557

    european organization for the research and treatment of cancer quality of life questionnaire - breast cancer 42 items (eortc qlq-br42) during the past week: have you had soreness in your mouth?

  • EORTC QLQ-H and N43 Phase IV Module Version - Soreness in Mouth|EOR36-Soreness in Mouth|EOR36-Soreness in Mouth|EOR3633

    european organization for the research and treatment of cancer quality of life questionnaire - head and neck cancer phase iv module version 43 items (eortc qlq-h and n43 phase iv module version) during the past week: have you had soreness in your mouth?

  • Extent Have Soreness in Mouth Question|Extent Have Soreness in Mouth|Extent of Soreness in Mouth|Have you had soreness in your mouth

    a question about the extent to which an individual has or had soreness in their mouth.

  • Extreme Soreness Answer|Extreme Soreness|Extreme soreness

    a response indicating that an individual has or had extreme soreness.

  • Feel Pain, Soreness, or Aches in Some Areas of Body Question|Feel Pain, Soreness, or Aches in Some Areas of Body|I feel pain, soreness or aches in some areas of my body

    a question about whether an individual feels or felt pain, soreness, or aches in some areas of their body.

  • Have Vaginal Soreness Question|Have Vaginal Soreness|Soreness|Vaginal Soreness

    a question about whether an individual has or had vaginal soreness.

  • Have Vulvar Soreness Question|Have Vulvar Soreness|Soreness|Vulvar Soreness

    a question about whether an individual has or had vulvar soreness.

  • How Much Mouth and Throat Soreness Limits Drinking Question|How Much Mouth and Throat Soreness Limits Drinking|How much did MOUTH AND THROAT SORENESS limit drinking

    a question about how much mouth and throat soreness limits or limited an individual's drinking.

  • How Much Mouth and Throat Soreness Limits Eating Question|How Much Mouth and Throat Soreness Limits Eating|How much did MOUTH AND THROAT SORENESS limit eating

    a question about how much mouth and throat soreness limits or limited an individual's eating.

  • How Much Mouth and Throat Soreness Limits Sleeping Question|How Much Mouth and Throat Soreness Limits Sleeping|How much did MOUTH AND THROAT SORENESS limit sleeping

    a question about how much mouth and throat soreness limits or limited an individual's sleeping.

  • How Much Mouth and Throat Soreness Limits Swallowing Question|How Much Mouth and Throat Soreness Limits Swallowing|How much did MOUTH AND THROAT SORENESS limit swallowing

    a question about how much mouth and throat soreness limits or limited an individual's swallowing.

  • How Much Mouth and Throat Soreness Limits Talking Question|How Much Mouth and Throat Soreness Limits Talking|How much did MOUTH AND THROAT SORENESS limit talking

    a question about how much mouth and throat soreness limits or limited an individual's talking.

  • How Much Mouth and Throat Soreness Limits Tooth Brushing Question|How Much Mouth and Throat Soreness Limits Tooth Brushing|How much did MOUTH AND THROAT SORENESS limit brushing your teeth

    a question about how much mouth and throat soreness limits or limited an individual's tooth brushing.

  • How Much Mouth and Throat Soreness Question|How Much Mouth and Throat Soreness|How much MOUTH AND THROAT SORENESS did you experience in the past week

    a question about the amount of mouth and throat soreness that an individual is experiencing or has experienced.

  • Moderate Soreness Answer|Moderate Soreness|Moderate soreness

    a response indicating that an individual has or had moderate soreness.

  • Muscle Soreness

    achiness of the muscles.

  • No Soreness Answer|No Soreness|No soreness

    a response indicating that an individual has or had no soreness.

  • Overall Mouth and Throat Soreness Rating Question|On a scale from 0 to 10, how would you rate your OVERALL MOUTH AND THROAT SORENESS|Overall Mouth and Throat Soreness Rating

    a question about an individual's overall rating of their mouth and throat soreness on a scale of 1 through 10.

  • Quite a Lot of Soreness Answer|Quite a Lot of Soreness|Quite a lot of soreness

    a response indicating that an individual has or had quite a lot of soreness.

  • Soreness Scale|Soreness Likert Scale

    soreness likert scale

  • Soreness Score 0|0 - No soreness

    a response of 0 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 1|1

    a response of 1 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 10|10 - Worst possible soreness

    a response of 10 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 2|2

    a response of 2 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 3|3

    a response of 3 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 4|4

    a response of 4 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 5|5

    a response of 5 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 6|6

    a response of 6 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 7|7

    a response of 7 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 8|8

    a response of 8 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Soreness Score 9|9

    a response of 9 on a soreness scale that ranges from 0: no soreness to 10: worst possible soreness.

  • Musculoskeletal Pain

    pain that originates in the bones, muscles, tendons or ligaments.

  • Pain Amplification Syndrome|Amplified Musculoskeletal Pain Syndrome|Amplified Musculoskeletal Pain Syndrome|Chronic Widespread Pain|Chronic Widespread Pain

    a condition in which the nerves register normal stimuli (lack of tissue injury) as pain, resulting in feelings of intense pain with even minor sensory input.

  • Rheumatologic Disorder|Collagen Disease|Collagen Vascular Disease|Connective Tissue Disease|Inflammatory Rheumatism|Musculoskeletal Pain Disorder|Rheumatic Disease|Rheumatism|Rheumatism|Rheumatologic Disease|collagen disease|rheumatism

    inflammatory and degenerative diseases of connective tissue structures, such as arthritis.

  • Bothered by Sore Muscles|Bothered by Muscle Soreness|Have you, during the past week, been bothered by sore muscles

    a question about whether an individual is or was bothered by sore muscles.

  • Extent Have Soreness in Mouth|Extent of Soreness in Mouth|Have you had soreness in your mouth

    a question about the extent to which an individual has or had soreness in their mouth.

  • FACIT-Searchable Item Library Adult Version - Pain/Soreness/Aches in Some Muscles|FSIL-Pain/Soreness/Aches in Some Muscles|FSIL-Pain/Soreness/Aches in Some Muscles|FSIL0420

    functional assessment of chronic illness therapy-searchable item library adult version (facit-searchable item library adult version) i feel pain, soreness or aches in some of my muscles.

  • Feel Pain, Soreness, or Aches in Some Areas of Body|I feel pain, soreness or aches in some areas of my body

    a question about whether an individual feels or felt pain, soreness, or aches in some areas of their body.

  • Have Vaginal Soreness|Soreness|Vaginal Soreness

    a question about whether an individual has or had vaginal soreness.

  • Have Vulvar Soreness|Soreness|Vulvar Soreness

    a question about whether an individual has or had vulvar soreness.

  • KDQOL-36 Version 1 - Bothered by Soreness in Muscles|KDQ1-Bothered by Soreness in Muscles|KDQ1-Bothered by Soreness in Muscles|KDQ117

    kidney disease and quality of life-36 version 1 (kdqol-36 version 1) during the past 4 weeks, to what extent were you bothered by each of the following: soreness in your muscles?

  • PHQ Screener Version - Muscle Tension|PHQ03-Muscle Tension/Aches/Soreness|PHQ03-Muscle Tension/Aches/Soreness|PHQ0305D

    patient health questionnaire screener version (phq screener version) over the last 4 weeks, how often have you been bothered by muscle tension, aches, or soreness?

  • Pregnancy Related Breast Soreness|Pregnancy Breast Soreness

    the tenderness of the breasts during pregnancy due to changes in the hormonal levels and increased breast tissue growth.

  • Soreness

    a dull achy pain.

Patient EducationClinical

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.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Code History & ChangesHistory

Replacement M79.10 replaces the following previously assigned code(s):

  • M79.1 - Myalgia
FY 2019AddedAdded to the ICD-10-CM code setEffective October 1, 2018.
FY 2020–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M79.10Overview

Is M79.10 (Myalgia) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report myalgia, unspecified site on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M79.10 group to?

When myalgia, unspecified site is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8306 to 1.3218 depending on complications. Higher weights mean higher Medicare reimbursement.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.