2026 ICD-10-CM Diagnosis Code M62.85Dysfunction of the multifidus muscles, lumbar region

ICD-10-CM Codes›M00–M99›M60-M63›M62

ICD-10-CM M62.85
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

M62.85 is a billable ICD-10-CM diagnosis code for dysfunction of the multifidus muscles, lumbar region. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 557 through 558. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Muscle disorders.

Code Identity

ICD-10-CM Code
M62.85
Billable Status
Yes — Valid for Submission
Code Describes
Dysfunction of the multifidus muscles, lumbar region
Short Description
Dysfunction of the multifidus muscles, lumbar region
Same as the full description in the CMS dataset.
Parent Code
M62.8
Other specified disorders of muscle

Code Classification

ChapterM00–M99Diseases of the musculoskeletal system and connective tissue
SectionM60-M63Disorders of muscles
CategoryM62Other disorders of muscle
This CodeM62.85Dysfunction of the multifidus muscles, lumbar region

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.

    • Dysfunction
      • multifidus muscles, lumbar region

Clinical ClassificationClinical

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

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

Code History & ChangesHistory

Replacement M62.85 replaces the following previously assigned code(s):

  • M62.89 - Other specified disorders of muscle
FY 2025AddedAdded to the ICD-10-CM code setEffective October 1, 2024.
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About M62.85Overview

Is M62.85 (Other specified disorders of muscle) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report dysfunction of the multifidus muscles, lumbar region on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does M62.85 group to?

When dysfunction of the multifidus muscles, lumbar region is the principal diagnosis on an inpatient stay, it groups to MS-DRG 557, 558, with relative weights from 0.8932 to 1.4869 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.