2027 ICD-10-CM Diagnosis Code M62.521Muscle wasting and atrophy, not elsewhere classified, right upper arm
ICD-10-CM Codes›M00–M99›M60-M63›M62
- Billable — Valid for Submission
- Not Chronic
M62.521 is a billable ICD-10-CM diagnosis code for muscle wasting and atrophy, not elsewhere classified, right upper arm. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 557 through 558. Coders also document this condition as atrophy of muscle of left upper arm. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Muscle disorders.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Atrophy of muscle of left upper arm
- Atrophy of muscle of right upper arm
- Atrophy of muscle of upper arm
- Bilateral atrophy of muscle of upper arms
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to M62.521: its own notes plus those printed at M62.5, M62, 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.
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.
- pelvic muscle wasting (N81.84)
- 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.
- 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.
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
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.
Convert M62.521 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About M62.521Overview
What is the ICD-10 code for muscle wasting and atrophy, not elsewhere classified, right upper arm?
The ICD-10-CM code for muscle wasting and atrophy, not elsewhere classified, right upper arm is M62.521 (sometimes written as M62521). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is M62.521 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report muscle wasting and atrophy, not elsewhere classified, right upper arm on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does M62.521 group to?
When muscle wasting and atrophy, not elsewhere classified, right upper arm is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8873 to 1.4883 depending on complications. Higher weights mean higher Medicare reimbursement.
Can M62.521 be reported with G54.5?
Not as a rule. The Excludes1 note at M62.5, which applies to M62.521, lists "neuralgic amyotrophy (G54.5)". 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 M62.521?
Under the General Equivalence Mappings, muscle wasting and atrophy, not elsewhere classified, right upper arm converts to ICD-9-CM 728.2 (musc disuse atrophy NEC). The mapping is approximate, so confirm the match fits the documentation.
