B49 Unspecified mycosis

The ICD-10-CM code for Unspecified mycosis is B49 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

1: Certain infectious and parasitic diseases (A00-B99)

Section

B35-B49: Mycoses (B35-B49)

Category B49

1 code (1 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to B49:

• Fungemia NOS
• Mycelium infection
• Pneumomycosis
• Mycosis, mycotic
• Bronchomycosis NOS
• Keratomycosis
• Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) › mycotic NEC
• Cough (affected) (epidemic) (nervous) › tea taster's

Inclusion Terms

• Fungemia NOS

U.S. Hospital Utilization

• An estimated 14,480 U.S. inpatient stays in 2023 included B49 among the documented diagnoses.
• 460 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

HIV Infections (TOC entry)

a. Human Immunodeficiency Virus (HIV) Infections .............................................................. 19

Infectious agents causing diseases in other chapters (TOC)

b. Infectious agents as the cause of diseases classified to other chapters ................................. 22

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)