Unspecified mycosis (B49) ICD-10-CM
The B49 code range covers unspecified mycosis with 1 ICD-10-CM diagnosis codes. 1 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.
- Fungemia NOS
Codes in the B49 Range 1 codes · 1 billable
- B49 Unspecified mycosis
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B49 range.
Allergic Fungal Sinusitis
Fungal infection in the PARANASAL SINUSES characterized by common allergy respiratory symptoms, recurrent NASAL POLYPS and/or ASTHMA with buildup of allergic MUCIN.
Chorioamnionitis
INFLAMMATION of the placental membranes (CHORION; AMNION) and connected tissues such as fetal BLOOD VESSELS and UMBILICAL CORD. It is often associated with intrauterine ascending infections during PREGNANCY.
Fungemia
The presence of fungi circulating in the blood. Opportunistic fungal sepsis is seen most often in immunosuppressed patients with severe neutropenia or in postoperative patients with intravenous catheters and usually follows prolonged antibiotic therapy.
About the B49 Code Range
The ICD-10 code B49 is used for classifying unspecified mycosis, which covers fungal infections when the exact type of fungus is not identified. This code helps document a wide range of fungal infections that affect various parts of the body but lack a more specific diagnosis.
This code includes conditions commonly referred to by terms such as allergic bronchopulmonary mycosis, fungal sinusitis, fungal pneumonia, fungal meningitis, and fungal arthritis. It also covers invasive fungal infections affecting organs like the liver, kidneys, lungs, and central nervous system, as well as rarer manifestations like fungal endophthalmitis (eye infection) and fungal myocarditis. Because it encompasses many synonyms and related conditions—such as fungal spinal epidural abscess, fungal colitis, and fungal granuloma—the ICD-10 code for unspecified mycosis is crucial when diagnosing fungal infections without identified species or exact pathology. This broad classification supports accurate coding when tests have confirmed a fungal infection exists, but further specification is unavailable.
Questions About This Page
How many billable codes are in the B49 range?
Of the 1 codes in this range, 1 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the B49 range classify?
The range classifies unspecified mycosis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
