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.

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

CMS phased in the V28 risk adjustment model over payment years 2024 (33%), 2025 (67%), and 2026 (100%), replacing V24. V28 consolidates HCC categories, removes some lower-acuity conditions, and recalibrates RAF weights across the entire model. B41.0 was a payment HCC under V24 (Pneumococcal Pneumonia, Empyema, Lung Abscess) but the V28 recalibration removed it from the risk adjustment model. Both models can still appear in legacy data and in payer-specific lookback periods.

What should coders know when reporting B41.0?

This infection is more common in Central and South America Document severity and extent of pulmonary involvement when available Because B41.0 maps to a payment HCC, the documentation must also satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's risk adjustment score.

B41.0: Pulmonary paracoccidioidomycosis — ICD-10 | Pneumococcal Pneumonia, Empyema, Lung Abscess

ICD-10-CM Code View

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Code lookupB41.0Effective 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.

CMS-HCC V28

Not risk-adjusted for this model/period.

RAF 0

CMS-HCC V24

Mapped

HCC 115

Pneumococcal Pneumonia, Empye...

RAF 0.339

ACA/HHS

Not risk-adjusted for this model/period.

RAF 0

ESRD/PACE

Mapped

HCC 115

Pneumococcal Pneumonia, Empye...

RAF 0.0

RXHCC

Not risk-adjusted for this model/period.

RAF 0

Code Trumping

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Code Book Path

Official

B41Paracoccidioidomycosis

B41.0Pulmonary paracoccidioidomycosis

Inclusion Terms

Official

ICD-10-CM does not list inclusion terms for B41.0 in this effective period.

Excludes 2

Official

ICD-10-CM does not list Excludes 2 notes for B41.0 in this effective period.

Related Child Codes

Official

B41.7Disseminated paracoccidioidomycosis

B41.8Other forms of paracoccidioidomycosis

B41.9Paracoccidioidomycosis, unspecified

Includes

Official

Brazilian blastomycosis
Lutz' disease

Excludes 1

Official

ICD-10-CM does not list Excludes 1 notes for B41.0 in this effective period.

Code First

Official

ICD-10-CM does not list Code First sequencing instructions for B41.0 in this effective period.

Use Additional

Official

ICD-10-CM does not list Use Additional Code instructions for B41.0 in this effective period.

Code Also

Official

ICD-10-CM does not list Code Also instructions for B41.0 in this effective period.

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

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 B41.0 an HCC code?

Yes. B41.0 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess under the V24 model but is not retained in V28.

HCC Category Mapping

V24HCC 115, Pneumococcal Pneumonia, Empyema, Lung Abscess

0.339

ESRDHCC 115, Pneumococcal Pneumonia, Empyema, Lung Abscess

0.000

RAF weights shown are the community, non-dual, aged base weights from the CMS risk adjustment model file. Actual per-patient RAF contribution depends on member segment, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains in use during the transition and for historical data.

MEAT Criteria for B41.0

For B41.0to count as a valid HCC diagnosis in a given encounter, the provider's documentation must show MEAT: Monitor, Evaluate, Assess, or Treat. A diagnosis from a prior year does not carry forward automatically, it has to be re-documented and supported each calendar year.

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

Only one of M/E/A/T is required to support the code, but the documentation must be specific enough to show that the provider actually addressed B41.0 during that encounter, not just copy-forwarded from a problem list.

Coder workflow notes

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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).

Under the older CMS-HCC V24 model, B41.0 maps to Pneumococcal Pneumonia, Empyema, Lung Abscess (HCC 115) with a community, non-dual, aged base RAF weight of 0.339. V28 is the CMS-HCC risk adjustment model that reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition.

This infection is more common in Central and South America. Because B41.0 maps to a payment HCC, the provider's documentation must satisfy MEAT criteria (Monitor, Evaluate, Assess, or Treat) for the encounter to count toward the patient's Medicare Advantage risk adjustment score. 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, RAF weights, 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