ICD-10 B49
Billable / Specific CCUnspecified mycosis
About ICD-10-CM B49
ICD-10-CM code B49 represents Unspecified mycosis. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block B49). The 2026 edition of ICD-10-CM B49 became effective on October 1, 2025.
Coding Tips for B49
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
B49 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under B49. Per CMS ICD-10-CM Tabular 2026.
- Fungemia NOS
Inpatient DRG Impact, CC
codes Unspecified mycosis. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for B49
Local Coverage Determinations (LCDs) from CMS MACs that list B49 as a covered diagnosis.
Showing top 2. Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing B49.
1 Cigna
1 Medicare
CPT Codes Commonly Billed with B49
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert B49 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| B49 | 1179 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To B49
Other codes in section B35-B49 (Mycoses).
ICD-10 B49, Billing FAQ
Is ICD-10 code B49 billable? +
Yes, B49 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to B49? +
ICD-10 B49 includes: Fungemia NOS.
Is B49 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does B49 map to? +
Per CMS GEMs, B49 maps to ICD-9 codes: 1179. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on May 31, 2026.
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