D73.1 Hypersplenism

The ICD-10-CM code for Hypersplenism is D73.1 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

3: Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89)

Section

D70-D77: Other disorders of blood and blood-forming organs (D70-D77)

Category D73

11 codes (9 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to D73.1:

• Gandy-Nanta disease (siderotic splenomegaly)
• Big spleen syndrome
• Gamna's disease (siderotic splenomegaly)
• Hypersplenia, hypersplenism
• Metaplasia › myelogenous
• Increase, increased › splenic activity
• Metaplasia › myeloid (agnogenic) (megakaryocytic)
• Aleukia › splenica

U.S. Hospital Utilization

• An estimated 10,285 U.S. inpatient stays in 2023 included D73.1 among the documented diagnoses.
• 60 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 3 TOC entry

3. Chapter 3: Disease of the blood and blood-forming organs and certain disorders involving the immune mechanism (D50-D89) ............................................................................................. 39

Reserved for future guideline expansion

Reserved for future guideline expansion ...................................................................................... 39

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)