What is ICD-10 code B41.0?

B41.0 is the ICD-10-CM diagnosis code for Pulmonary paracoccidioidomycosis. A fungal lung infection caused by Paracoccidioides, a fungus found in soil and vegetation, primarily affecting the respiratory system. It belongs to the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99). B41.0 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. B41.0 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. B41.0 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. B41.0 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 B41.0 map to under V28?

B41.0 has no payable CMS-HCC V28 mapping in the final FY2026 CMS file.

What RAF reference is published for B41.0?

B41.0 has no V28 reference coefficient because the final FY2026 source verifies no payable V28 mapping.

What is the V28 vs V24 difference for B41.0?

B41.0 has verified no payable V28 mapping in the final FY2026 source. Select a historical effective period before making any V24 comparison.

What documentation supports B41.0?

This infection is more common in Central and South America Document severity and extent of pulmonary involvement when available B41.0 is not a CMS-HCC V28 payment code in the verified current source, so MEAT is not the payment hook. Documentation still has to support the diagnosis if you report it.

2026 ICD-10-CM B41.0: Pulmonary paracoccidioidomycosis

B41.0 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

ICD-10-CM Code View

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Digital ICD-10 code-book layout with official code detail, always-visible risk models, Code Trumping, and Buddy coding guidance.

Code lookupB41.0

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

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

B41.0

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

Pulmonary paracoccidioidomycosis

A fungal lung infection caused by Paracoccidioides, a fungus found in soil and vegetation, primarily affecting the respiratory system.

Buddy Insight

Pulmonary paracoccidioidomycosis is caused by Paracoccidioides brasiliensis, an endemic dimorphic fungus in Latin America.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

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 163

HHS-HCC 163 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 115

Pneumococcal Pneumonia/Empyem...

Code-level coefficient reference

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

B41Paracoccidioidomycosis B41.0Pulmonary paracoccidioidomycosis

Inclusion Terms

Official

No inclusion terms are included in this display for B41.0. Check the code and parent instructions in the Code Book.

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

B41.7Disseminated paracoccidioidomycosis B41.8Other forms of paracoccidioidomycosis B41.9Paracoccidioidomycosis, unspecified

Includes

Official

diseases generally recognized as communicable or transmissibleInherited from A00-B99, B41
Brazilian blastomycosisInherited from A00-B99, B41
Lutz' diseaseInherited from A00-B99, B41

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 B41.0. 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 B41.0. Check the code and parent instructions in the Code Book.

Buddy Documentation Tip

HCC Buddy guidance

Positive culture, serology, or histopathologic confirmation of Paracoccidioides

Pulmonary imaging findings (bilateral interstitial infiltrates, fibrosis, cavitation)

Travel or residence history in endemic areas (Brazil, Colombia, Venezuela, Argentina)

Respiratory symptoms documented: chronic cough, dyspnea, chest pain

MEAT Support

HCC Buddy guidance

Positive culture, serology, or histopathologic confirmation of Paracoccidioides

Pulmonary imaging findings (bilateral interstitial infiltrates, fibrosis, cavitation)

Travel or residence history in endemic areas (Brazil, Colombia, Venezuela, Argentina)

Respiratory symptoms documented: chronic cough, dyspnea, chest pain

Audit Caution

HCC Buddy guidance

Confusing paracoccidioidomycosis with other endemic mycoses due to similar clinical presentations — organism identification is essential

Missing oral/mucocutaneous involvement which is a hallmark of this disease and may require additional codes

Failing to document the geographic exposure history that supports this rare diagnosis in non-endemic settings

Common Mistakes

HCC Buddy guidance

B38.0-B38.2 (Pulmonary coccidioidomycosis) - different endemic fungus; coccidioidomycosis is southwestern US, paracoccidioidomycosis is South America

B39.0-B39.2 (Pulmonary histoplasmosis) - different organism; distinction requires culture or serologic confirmation

B41.7 (Disseminated paracoccidioidomycosis) - use when infection has spread beyond the lungs to other organs

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 B41.0 an HCC code?

B41.0 is not in the CMS-HCC V28 or V24 community payment model. B41.0 has a separate mapping under the CMS-HCC ESRD model (HCC 115 (Pneumococcal Pneumonia/Empyema/Lung Abscess)); the applicable result needs member context. B41.0 also appears in the HHS-HCC commercial risk model (HCC 163 (HHS-HCC 163 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping.

Code: B41.0
Description: Pulmonary paracoccidioidomycosis
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: Yes
Payment year: 2026

HCC Category Mapping

ESRDHCC 115, Pneumococcal Pneumonia/Empyema/Lung Abscess

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 B41.0 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for B41.0

For B41.0, 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

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What This Code Means

B41.0 is the ICD-10-CM diagnosis code for pulmonary paracoccidioidomycosis. A fungal lung infection caused by Paracoccidioides, a fungus found in soil and vegetation, primarily affecting the respiratory system. B41.0 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering mycoses (b35-b49).

B41.0 has no mapping under the CMS-HCC V28 or V24 community payment models. B41.0 has a separate mapping under the CMS-HCC ESRD model (HCC 115 (Pneumococcal Pneumonia/Empyema/Lung Abscess)); the applicable result needs member context. B41.0 also appears in the HHS-HCC commercial risk model (HCC 163 (HHS-HCC 163 adult, RAF varies by metal level)), which is a commercial market model rather than a Medicare Advantage payment mapping. Do not assign V28 risk adjustment value from this page; verify the applicable model and payment year before using this code for risk adjustment.

This infection is more common in Central and South America.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for B41.0 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•This infection is more common in Central and South America
•Document severity and extent of pulmonary involvement when available

Clinical Significance

Pulmonary paracoccidioidomycosis is caused by Paracoccidioides brasiliensis, an endemic dimorphic fungus in Latin America. This rare diagnosis in the United States typically involves patients with travel or immigration history. It can cause progressive pulmonary fibrosis and requires long-term antifungal therapy, making accurate coding essential for resource capture.

Documentation Requirements

✓Positive culture, serology, or histopathologic confirmation of Paracoccidioides
✓Pulmonary imaging findings (bilateral interstitial infiltrates, fibrosis, cavitation)
✓Travel or residence history in endemic areas (Brazil, Colombia, Venezuela, Argentina)
✓Respiratory symptoms documented: chronic cough, dyspnea, chest pain
✓Duration and treatment plan for antifungal therapy

Commonly Confused Codes

•B38.0-B38.2 (Pulmonary coccidioidomycosis) - different endemic fungus; coccidioidomycosis is southwestern US, paracoccidioidomycosis is South America
•B39.0-B39.2 (Pulmonary histoplasmosis) - different organism; distinction requires culture or serologic confirmation
•B41.7 (Disseminated paracoccidioidomycosis) - use when infection has spread beyond the lungs to other organs