K64.5 Perianal venous thrombosis

The ICD-10-CM code for Perianal venous thrombosis is K64.5 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

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

Section

K55-K64: Other diseases of intestines (K55-K64)

Category K64

9 codes (8 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to K64.5:

• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › perianal venous
• Hemorrhoids (bleeding) (without mention of degree) › thrombosed
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › anal
• Hematoma (traumatic) (skin surface intact) › perianal (nontraumatic)
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › venous, perianal
• Thrombosis, thrombotic (bland) (multiple) (progressive) (silent) (vessel) › vein (acute) › perianal
• Hemorrhoids (bleeding) (without mention of degree) › external › with › thrombosis

Inclusion Terms

• External hemorrhoids with thrombosis
• Perianal hematoma
• Thrombosed hemorrhoids NOS

U.S. Hospital Utilization

• An estimated 3,600 U.S. inpatient stays in 2023 included K64.5 among the documented diagnoses.
• 740 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)