2026 ICD-10-CM Diagnosis Code M62.838Other muscle spasm

ICD-10-CM Codes›M00–M99›M60-M63›M62

ICD-10-CM M62.838
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M62.838 is a billable ICD-10-CM diagnosis code for other muscle spasm. 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 Muscle disorders.

Code Identity

ICD-10-CM Code
M62.838
Billable Status
Yes — Valid for Submission
Code Describes
Other muscle spasm
Short Description
Other muscle spasm
Same as the full description in the CMS dataset.
Parent Code
M62.83
Muscle spasm

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM60-M63Disorders of muscles
CategoryM62Other disorders of muscle
This CodeM62.838Other muscle spasm

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Abnormal movement
  • Bilateral spasm of piriformis muscle
  • Emprosthotonus
  • Lower limb spasticity
  • Muscle spasm of cervical muscle of neck
  • Muscle spasm of head and/or neck
  • Muscle spasticity of spinal origin
  • Muscle spasticity present
  • Muscle tension
  • Myospasm of masticatory muscle
  • Perioral spasm
  • Protective muscle spasm
  • Smooth muscle spasm
  • Spasm of cervical paraspinous muscle
  • Spasm of left piriformis muscle
  • Spasm of piriformis muscle
  • Spasm of right piriformis muscle
  • Spasm of skeletal muscle of thorax
  • Stress-induced muscle tension
  • Upper limb spasticity

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.

    • Spasm(s), spastic, spasticity
      • muscle NEC

Clinical ClassificationClinical

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

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

Patient EducationClinical

Neuromuscular Disorders

Neuromuscular disorders affect your neuromuscular system. They can cause problems with:

Read the full article at MedlinePlus

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

Convert M62.838 to ICD-9-CMHistory

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

ICD-9-CM
728.85 Spasm of muscle
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 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M62.838Overview

Is M62.838 (Muscle spasm) a billable code?

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

What MS-DRG does M62.838 group to?

When other muscle spasm 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.

What is the ICD-9 equivalent of M62.838?

Under the General Equivalence Mappings, other muscle spasm converts to ICD-9-CM 728.85 (spasm of muscle). The mapping is approximate, so confirm the match fits the documentation.

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.