2026 ICD-10-CM Diagnosis Code L98.425Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis

ICD-10-CM Codes›L00–L99›L80-L99›L98

ICD-10-CM L98.425
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

L98.425 is a billable ICD-10-CM diagnosis code for non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 573 through 575, 592 through 594. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Non-pressure ulcer of skin.

Code Identity

ICD-10-CM Code
L98.425
Billable Status
Yes — Valid for Submission
Code Describes
Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis
Short Description
Non-prs chr ulcer of back with muscle invl w/o evd of necr
Parent Code
L98.42
Non-pressure chronic ulcer of back

Code Classification

ChapterL00–L99Diseases of the skin and subcutaneous tissue
SectionL80-L99Other disorders of the skin and subcutaneous tissue
CategoryL98Other disorders of skin and subcutaneous tissue, not elsewhere classified
This CodeL98.425Non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis

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.

    • Ulcer, ulcerated, ulcerating, ulceration, ulcerative
      • back
        • with
          • muscle involvement without evidence of necrosis

Clinical ClassificationClinical

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

CCSR SKN004
Non-pressure ulcer of skin
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Skin Conditions

Your skin is your body's largest organ. It covers the entire outside of your body. There are many ways that your skin protects your body and helps keep you healthy. For example, it:

The full article covers:

  • What does your skin do?
  • What problems and conditions can affect your skin?
  • How can I keep my skin healthy?

Read the full article at MedlinePlus

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

Convert L98.425 to ICD-9-CMHistory

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

ICD-9-CM
707.8 Chronic skin ulcer NEC
Approximate The match is approximate rather than exact.

Code History & ChangesHistory

Replacement L98.425 replaces the following previously assigned code(s):

  • L98.429 - Non-pressure chronic ulcer of back with unspecified severity
FY 2018AddedAdded to the ICD-10-CM code setEffective October 1, 2017.
FY 2019–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About L98.425Overview

Is L98.425 (Non-pressure chronic ulcer of back) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does L98.425 group to?

When non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 573, 574, 575, 592, 593, 594, with relative weights from 0.8668 to 6.5514 depending on complications. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of L98.425?

Under the General Equivalence Mappings, non-pressure chronic ulcer of back with muscle involvement without evidence of necrosis converts to ICD-9-CM 707.8 (chronic skin ulcer NEC). The mapping is approximate, so confirm the match fits the documentation.

Footnotes

[1] Chronic - a chronic condition code indicates a condition lasting 12 months or longer and its effect on the patient based on one or both of the following criteria:

  • The condition results in the need for ongoing intervention with medical products,treatment, services, and special equipment
  • The condition places limitations on self-care, independent living, and social interactions.