K65.4 Sclerosing mesenteritis

The ICD-10-CM code for Sclerosing mesenteritis is K65.4 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

11: Diseases of the digestive system (K00-K95)

Section

K65-K68: Diseases of peritoneum and retroperitoneum (K65-K68)

Category K65

8 codes (7 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K65.4:

• Panniculitis (nodular) (nonsuppurative) › mesenteric
• Mesenteritis › sclerosing
• Lipodystrophy › mesenteric
• Mesenteritis › retractile
• Fibrosis, fibrotic › sclerosing mesenteric (idiopathic)
• Necrosis, necrotic (ischemic) › omentum (with mesenteric infarction) › fat
• Necrosis, necrotic (ischemic) › mesentery › fat
• Necrosis, necrotic (ischemic) › fat, fatty (generalized) › peritoneum

Inclusion Terms

• Fat necrosis of peritoneum
• (Idiopathic) sclerosing mesenteric fibrosis
• Mesenteric lipodystrophy
• Mesenteric panniculitis
• Retractile mesenteritis

U.S. Hospital Utilization

• An estimated 6,310 U.S. inpatient stays in 2023 included K65.4 among the documented diagnoses.
• 855 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

Chapter 11 reserved for future expansion

11. Chapter 11: Diseases of the Digestive System (K00-K95) Reserved for future guideline expansion

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)