2027 ICD-10-CM Diagnosis Code M60.829Other myositis, unspecified upper arm

ICD-10-CM Codes›M00–M99›M60-M63›M60

ICD-10-CM M60.829
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

M60.829 is a billable ICD-10-CM diagnosis code for other myositis, unspecified upper arm. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 555 through 556. Coders also document this condition as inflammation of muscle of upper arm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Muscle disorders.

Code Identity

ICD-10-CM Code
M60.829
Billable Status
Yes — Valid for Submission
Code Describes
Other myositis, unspecified upper arm
Short Description
Other myositis, unspecified upper arm
Same as the full description in the CMS dataset.
Parent Code
M60.82
Other myositis, upper arm

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM60-M63Disorders of muscles
CategoryM60Myositis
This CodeM60.829Other myositis, unspecified upper arm

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Inflammation of muscle of upper arm

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to M60.829: its own notes plus those printed at M60, block M60-M63, and Chapter 13. A note printed at a category, block or chapter applies to every code under it.

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block M60-M63 Disorders of muscles applies to 420 codes
  • dermatopolymyositis (M33.-)
  • myopathy in amyloidosis (E85.-)
  • myopathy in polyarteritis nodosa (M30.0)
  • myopathy in rheumatoid arthritis (M05.32)
  • myopathy in scleroderma (M34.-)
  • myopathy in Sjögren's syndrome (M35.03)
  • myopathy in systemic lupus erythematosus (M32.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From M60 Myositis applies to 111 codes
  • inclusion body myositis [IBM] (G72.41)
From Block M60-M63 Disorders of muscles applies to 420 codes
  • muscular dystrophies and myopathies (G71-G72)
From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • arthropathic psoriasis (L40.5-)
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • compartment syndrome (traumatic) (T79.A-)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations, and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Notes

General instructions on how these codes are used.

From Chapter 13 (M00-M99) Diseases of the musculoskeletal system and connective tissue applies to 6,687 codes
  • Use an external cause code following the code for the musculoskeletal condition, if applicable, to identify the cause of the musculoskeletal condition

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name M60.829, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming M60.829: they are not reported together with it, unless the two conditions are unrelated.

  • G72 Other and unspecified myopathies
    myositis (M60.-) names M60.-, which includes this code
  • M79.1 Myalgia
    myositis (M60.-) names M60.-, which includes this code

Excludes2 1

These codes carry an Excludes2 note naming M60.829: its condition is not part of those codes, and both may be reported when the patient has both.

  • G71 Primary disorders of muscles
    myositis (M60.-) names M60.-, which includes this code

Clinical ClassificationClinical

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

CCSR MUS026
Muscle disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Myositis

    inflammation of a muscle or muscle tissue.

Patient EducationClinical

Myositis

Myositis means inflammation of the muscles that you use to move your body. An injury, infection, or autoimmune disease can cause it. Two specific kinds are polymyositis and dermatomyositis. Polymyositis causes muscle weakness, usually in the muscles closest to the trunk of your body.

Read the full article at MedlinePlus

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

Convert M60.829 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
729.1 Myalgia and myositis NOS
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About M60.829Overview

What is the ICD-10 code for other myositis, unspecified upper arm?

The ICD-10-CM code for other myositis, unspecified upper arm is M60.829 (sometimes written as M60829). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is M60.829 (Other myositis, upper arm) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other myositis, unspecified upper arm on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does M60.829 group to?

When other myositis, unspecified upper arm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 555, 556, with relative weights from 0.8210 to 1.2908 depending on complications. Higher weights mean higher Medicare reimbursement.

Can M60.829 be reported with a code from M33?

Not as a rule. The Excludes1 note at block M60-M63, which applies to M60.829, lists "dermatopolymyositis (M33.-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

What is the ICD-9 equivalent of M60.829?

Under the General Equivalence Mappings, other myositis, unspecified upper arm converts to ICD-9-CM 729.1 (myalgia and myositis NOS). The mapping is approximate, so confirm the match fits the documentation.