2026 ICD-10-CM Diagnosis Code K68.2Retroperitoneal fibrosis

ICD-10-CM Codes›K00–K95›K65-K68›K68

ICD-10-CM K68.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

K68.2 is a billable ICD-10-CM diagnosis code for retroperitoneal fibrosis. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 371 through 373. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified gastrointestinal disorders.

Code Identity

ICD-10-CM Code
K68.2
Billable Status
Yes — Valid for Submission
Code Describes
Retroperitoneal fibrosis
Short Description
Retroperitoneal fibrosis
Same as the full description in the CMS dataset.
Parent Code
K68
Disorders of retroperitoneum

Code Classification

ChapterK00–K95Diseases of the digestive system
SectionK65-K68Diseases of peritoneum and retroperitoneum
CategoryK68Disorders of retroperitoneum
This CodeK68.2Retroperitoneal fibrosis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Retroperitoneal fibrosis

Tabular List NotesGuidance

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

Code Also

  • , if applicable, associated obstruction of ureter N13.5

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.

    • Fibrosis, fibrotic
      • retroperitoneal
    • Syndrome
      • retroperitoneal fibrosis

Clinical ClassificationClinical

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

CCSR DIG025
Other specified and unspecified gastrointestinal disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Retroperitoneal Fibrosis

    a slowly progressive condition of unknown etiology, characterized by deposition of fibrous tissue in the retroperitoneal space compressing the ureters, great vessels, bile duct, and other structures. when associated with abdominal aortic aneurysm, it may be called chronic periaortitis or inflammatory perianeurysmal fibrosis.

  • Idiopathic Retroperitoneal Fibrosis|Ormond's Disease

    a condition characterized by abnormal proliferation of fibrous tissue in the compartment posterior to the peritoneum, for which no underlying cause has been identified.

  • Retroperitoneal Fibrosis

    a rare, serious disorder characterized by extensive fibrosis in the retroperitoneum. in most cases its etiology is unknown. in some cases it is related to autoimmunity or metastatic cancer. it leads to the entrapment and obstruction of vital retroperitoneal structures including the ureters.

Code History & ChangesHistory

Replacement K68.2 replaces the following previously assigned code(s):

  • K68.9 - Other disorders of retroperitoneum
FY 2024AddedAdded to the ICD-10-CM code setEffective October 1, 2023.
FY 2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About K68.2Overview

Is K68.2 (Disorders of retroperitoneum) a billable code?

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

What MS-DRG does K68.2 group to?

When retroperitoneal fibrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 371, 372, 373, with relative weights from 0.7274 to 1.7731 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.