B49 ICD-10-CM Code: Unspecified mycosis
HCC Buddy Code Card
Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.
FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Mycoses (B35-B49)
B49
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceUnspecified mycosis
A fungal infection where the specific type of fungus has not been identified or specified.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
N/A—
Not mapped
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Fungemia NOS
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for B49 in this effective period.
Related Child Codes
ICD-10-CM does not list child codes under B49 for this display context.
Includes
OfficialICD-10-CM does not list Includes notes for B49 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for B49 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for B49 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for B49 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for B49 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is B49 an HCC code?
No. B49 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B49 is the ICD-10-CM diagnosis code for unspecified mycosis. A fungal infection where the specific type of fungus has not been identified or specified. B49 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering mycoses (b35-b49).
B49 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when the fungal organism cannot be determined or is not documented.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for B49 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the fungal organism cannot be determined or is not documented
- •Query the provider for more specific fungal identification if possible to allow for more precise coding