ICD-10 B44.0
Billable / Specific HCC v28: 6 MCCInvasive pulmonary aspergillosis
About ICD-10-CM B44.0
ICD-10-CM code B44.0 represents Invasive pulmonary aspergillosis. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block B44). The 2026 edition of ICD-10-CM B44.0 became effective on October 1, 2025.
Coding Tips for B44.0
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
B44.0 is a CMS-HCC v28 risk-adjustment code (category 6). To count for the patient Risk Adjustment Factor (RAF), document the diagnosis with MEAT language each calendar year: Monitored, Evaluated, Assessed, Treated. A diagnosis on the problem list alone does not satisfy CMS RADV audit standards. Include the diagnosis in the assessment with current status and current treatment plan.
B44.0 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Medicare Advantage HCC Impact
Capture this diagnosis annually for accurate risk adjustment. Missed HCC captures are the #1 revenue leak in Medicare Advantage risk programs.
Inpatient DRG Impact, MCC
codes Invasive pulmonary aspergillosis. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for B44.0
Local Coverage Determinations (LCDs) from CMS MACs that list B44.0 as a covered diagnosis.
Showing top 10 of 267 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing B44.0.
2 Aetna
5 Medicare
CPT Codes Commonly Billed with B44.0
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 0031U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0173U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0423U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 81407 CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0349U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 81408 CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0175U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0032U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 81220 CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
- 0392U CMS LCD: Billing and Coding: Pharmacogenomics Testing CMS LCD
Convert B44.0 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 |
|---|---|---|
| B44.0 | 1173 | 10111 |
| B44.0 | 4846 | 10112 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To B44.0
Other codes in section B35-B49 (Mycoses).
ICD-10 B44.0, Billing FAQ
Is ICD-10 code B44.0 billable? +
Yes, B44.0 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Does B44.0 affect Medicare Advantage HCC risk adjustment? +
Yes. B44.0 maps to CMS-HCC v28 category 6. Capture this diagnosis annually for accurate Medicare Advantage risk score.
Is B44.0 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What CPT codes are commonly billed with B44.0? +
Procedures frequently paired with B44.0 include: 0031U, 0173U, 0423U, 81407, 0349U.
What ICD-9 codes does B44.0 map to? +
Per CMS GEMs, B44.0 maps to ICD-9 codes: 1173, 4846. 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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