2027 ICD-10-CM Diagnosis Code K68.2Retroperitoneal fibrosis

ICD-10-CM Codes›K00–K95›K65-K6A›K68

ICD-10-CM K68.2
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

K68.2 is a billable ICD-10-CM diagnosis code for retroperitoneal fibrosis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373, 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 19 closely related codes. 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-K6ADiseases 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

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to K68.2: its own notes plus those printed at Chapter 11. A note printed at a category, block or chapter applies to every code under it.

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 11 (K00-K95) Diseases of the digestive system applies to 863 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

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

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name K68.2, its category, or a range that includes it.

Excludes1 1

These codes carry an Excludes1 note naming K68.2: they are not reported together with it, unless the two conditions are unrelated.

  • K65 Peritonitis
    retroperitoneal infections (K68.-) names K68.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

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.

Patient EducationClinical

Peritoneal Disorders

Your peritoneum is the tissue that lines your abdominal wall and covers most of the organs in your abdomen. A liquid, peritoneal fluid, lubricates the surface of this tissue.

Read the full article at MedlinePlus

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

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 2025–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About K68.2Overview

What is the ICD-10 code for retroperitoneal fibrosis?

The ICD-10-CM code for retroperitoneal fibrosis is K68.2 (sometimes written as K682). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does K68.2 group to?

When retroperitoneal fibrosis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 793, 791, 371, 373, with relative weights from 0.6945 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.

Is K68.2 a CC or MCC?

CMS lists K68.2 as an MCC (major complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 19 closely related codes in its exclusion list.