Unspecified mycosis
In Mycoses (B35-B49), chapter 1: Certain Infectious and Parasitic Diseases
- B49 is an unspecified code: use it only when the record doesn't document anything more specific. If the record has more detail, check the other codes under B35-B49 below.
- As a secondary diagnosis it is a CC (complication or comorbidity), which can raise the MS-DRG payment. It doesn't count when the principal diagnosis is one of 2 closely related codes.
- Doesn't count toward a Medicare Advantage risk score (no HCC in V28).
- AHRQ's Chronic Condition Indicator classes it as not chronic (an acute or short-term condition).
- 528 US deaths in 2024 had an underlying cause in category B49, per the National Vital Statistics System on CDC WONDER. Death records use WHO ICD-10, so the count is for the whole category.
Also indexed as: Arthritis, in, mycosis NEC; Arthritis, mycotic NEC; Bronchomycosis NOS; Cough, tea taster's; Diarrhea, mycotic NEC; Disease, fungus NEC; Disease, mycotic; Fungemia NOS; Fungus, disease NOS; Infection, fungus NOS; Infection, mycelium NOS; Infection, mycotic NOS; Keratomycosis; Meningitis, mycotic NEC; Mycelium infection; Mycosis; Myositis, in, mycosis; Myositis, mycotic; Pneumomycosis
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Instructional notes
Includes: conditions that are coded here
- Fungemia NOS
Official coding guidelines
From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.
Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.
- Human Immunodeficiency Virus (HIV) Infections (page 19)
- Infectious agents as the cause of diseases classified to other chapters (page 22)
- Infections resistant to antibiotics (page 22)
- Sepsis, Severe Sepsis, and Septic Shock (page 23)
- Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
- Zika virus infections (page 28)
- Coronavirus infections (page 28)
Other codes under B35-B49
Mycoses (B35-B49)
- B35Dermatophytosis
- B36Other superficial mycoses
- B37Candidiasis
- B38Coccidioidomycosis
- B39Histoplasmosis
- B40Blastomycosis
- B41Paracoccidioidomycosis
- B42Sporotrichosis
- B43Chromomycosis and pheomycotic abscess
- B44Aspergillosis
- B45Cryptococcosis
- B46Zygomycosis
- B47Mycetoma
- B48Other mycoses, not elsewhere classified
- B49Unspecified mycosis(this code)
B49 MS-DRGs
As the principal diagnosis, B49 groups to MS-DRG 867, 868, or 869 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.
Related conditions
Grouped by AHRQ's Clinical Classifications Software Refined (CCSR), which sorts every diagnosis code into clinically meaningful categories.
Medicare coverage articles listing B49
This Medicare billing and coding article lists B49 as a diagnosis that supports medical necessity for the services they cover. From the CMS Medicare Coverage Database; check your own contractor's article before billing.
Other codes that refer to B49
Notes on these codes point to B49.
About the condition
Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.
Fungal Infections
If you have ever had athlete's foot or a yeast infection, you can blame a fungus. A fungus is a primitive organism. Mushrooms, mold and mildew are examples. Fungi live in air, in soil, on plants and in water. Some live in the human body. Only about half of all types of fungi are harmful.
Read more about fungal infections on MedlinePlusCode history
Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.
ICD-9-CM equivalent
Legacy crosswalk from the CMS General Equivalence Mappings (last updated 2018).
- 117.9 Other and unspecified mycoses (approximate)