2026 ICD-10-CM Diagnosis Code M62.831Muscle spasm of calf

ICD-10-CM Codes›M00–M99›M60-M63›M62

ICD-10-CM M62.831
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M62.831 is a billable ICD-10-CM diagnosis code for muscle spasm of calf. 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. Coders also document this condition as bilateral spasm of muscle of calves. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Muscle disorders.

Code Identity

ICD-10-CM Code
M62.831
Billable Status
Yes — Valid for Submission
Code Describes
Muscle spasm of calf
Short Description
Muscle spasm of calf
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 CodeM62.831Muscle spasm of calf

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral spasm of muscle of calves
  • Cramp in calf
  • Cramp in lower leg
  • Cramp in lower limb
  • Spasm of muscle of left calf
  • Spasm of muscle of right calf

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Charley-horse

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.

    • Charley-horse(quadriceps)

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 M62.831 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 M62.831Overview

Is M62.831 (Muscle spasm) a billable code?

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

What MS-DRG does M62.831 group to?

When muscle spasm of calf 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 M62.831?

Under the General Equivalence Mappings, muscle spasm of calf 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.