What is ICD-10 code B44.7?

B44.7 is the ICD-10-CM diagnosis code for Disseminated aspergillosis. A serious fungal infection caused by Aspergillus that has spread throughout the body affecting multiple organ systems. It belongs to the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99). B44.7 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. B44.7 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. B44.7 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. B44.7 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does B44.7 map to under V28?

B44.7 maps to CMS-HCC V28 HCC 6 (Opportunistic Infections). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM B44.7: Disseminated aspergillosis

B44.7 maps to CMS-HCC V28 6. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

ICD-10-CM Code View

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Code lookupB44.7

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Mycoses (B35-B49)

B44.7

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Disseminated aspergillosis

A serious fungal infection caused by Aspergillus that has spread throughout the body affecting multiple organ systems.

Buddy Insight

Disseminated aspergillosis represents the most severe form of Aspergillus infection, with hematogenous spread to multiple organs carrying extremely high mortality rates exceeding 80%.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 6

Opportunistic Infections

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 006

HHS-HCC 006 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 6

Opportunistic Infections

Code-level coefficient reference

RXHCC

Mapped

HCC 5

Opportunistic Infections

Code-level coefficient reference

Code Book Path

Official

B44Aspergillosis B44.7Disseminated aspergillosis

Inclusion Terms

Official

Generalized aspergillosis

Excludes 2

Official

carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99, B35-B49
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99, B35-B49
infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99, B35-B49
influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99, B35-B49
hypersensitivity pneumonitis due to organic dust (J67.-)Inherited from A00-B99, B35-B49
mycosis fungoides (C84.0-)Inherited from A00-B99, B35-B49

Related Codes

Official

B44.0Invasive pulmonary aspergillosis B44.1Other pulmonary aspergillosis B44.2Tonsillar aspergillosis B44.8Other forms of aspergillosis B44.9Aspergillosis, unspecified

Includes

Official

diseases generally recognized as communicable or transmissibleInherited from A00-B99, B44
aspergillomaInherited from A00-B99, B44

Excludes 1

Official

certain localized infections - see body system-related chaptersInherited from A00-B99

Code First

Official

No Code First sequencing instructions are included in this display for B44.7. Check the code and parent instructions in the Code Book.

Use Additional

Official

code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99

Code Also

Official

No Code Also instructions are included in this display for B44.7. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Documentation of multi-organ involvement with specific organs identified

Positive cultures, antigen testing, or histopathology from at least two non-contiguous sites

Severe immunocompromised state documented: prolonged neutropenia, transplant, high-dose steroids

Antifungal regimen and dose documented (combination therapy often used)

MEAT Support

HCC Buddy guidance

Documentation of multi-organ involvement with specific organs identified

Positive cultures, antigen testing, or histopathology from at least two non-contiguous sites

Severe immunocompromised state documented: prolonged neutropenia, transplant, high-dose steroids

Antifungal regimen and dose documented (combination therapy often used)

Audit Caution

HCC Buddy guidance

Coding as pulmonary aspergillosis (B44.0) when the infection has spread beyond the lungs — check for brain, skin, hepatic, renal involvement

Not coding each specific organ system involvement separately when documented (e.g., cerebral, hepatic, cutaneous)

Failing to capture the underlying immunosuppressed condition that enabled dissemination

Common Mistakes

HCC Buddy guidance

B44.0 (Invasive pulmonary aspergillosis) - limited to lung invasion; disseminated implies spread beyond lungs

B44.89 (Other forms of aspergillosis) - use for single-site infections in unusual locations, not multi-system disease

B44.9 (Aspergillosis, unspecified) - never use when disseminated disease is documented; significant clinical distinction

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Is B44.7 an HCC code?

Yes. B44.7 (Disseminated aspergillosis) maps to HCC 6, Opportunistic Infections under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.381. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: B44.7 is billable and maps to V28 HCC 6, Opportunistic Infections. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: B44.7
Description: Disseminated aspergillosis
HCC (V28): HCC 6 — Opportunistic Infections
RAF reference coefficient: 0.381
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 6, Opportunistic Infections

0.381

ESRDHCC 6, Opportunistic Infections

Not separately weighted

RxHCCHCC 5, Opportunistic Infections

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work B44.7 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for B44.7

For B44.7, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

B44.7 is the ICD-10-CM diagnosis code for disseminated aspergillosis. A serious fungal infection caused by Aspergillus that has spread throughout the body affecting multiple organ systems. B44.7 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering mycoses (b35-b49).

Under the CMS-HCC V28 risk adjustment model, B44.7 maps to Opportunistic Infections (HCC 6) with a source-labeled community, non-dual, aged reference coefficient of 0.381. No V24 mapping is shown for B44.7; use the applicable model and payment year when reviewing the V28 mapping. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

This code indicates systemic/disseminated disease; identify and code all affected organ systems separately. For B44.7, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for B44.7 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This code indicates systemic/disseminated disease; identify and code all affected organ systems separately
•Document immunocompromised status (HIV/AIDS, transplant, chemotherapy) as these patients are at higher risk

Clinical Significance

Disseminated aspergillosis represents the most severe form of Aspergillus infection, with hematogenous spread to multiple organs carrying extremely high mortality rates exceeding 80%. It occurs almost exclusively in severely immunocompromised patients and indicates critical illness requiring intensive medical management. Accurate capture is essential for reflecting true patient acuity.

Documentation Requirements

✓Documentation of multi-organ involvement with specific organs identified
✓Positive cultures, antigen testing, or histopathology from at least two non-contiguous sites
✓Severe immunocompromised state documented: prolonged neutropenia, transplant, high-dose steroids
✓Antifungal regimen and dose documented (combination therapy often used)
✓Clinical severity indicators: ICU status, organ failure, hemodynamic instability

Commonly Confused Codes

•B44.0 (Invasive pulmonary aspergillosis) - limited to lung invasion; disseminated implies spread beyond lungs
•B44.89 (Other forms of aspergillosis) - use for single-site infections in unusual locations, not multi-system disease
•B44.9 (Aspergillosis, unspecified) - never use when disseminated disease is documented; significant clinical distinction