1. ICD-10-CM Codes
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2. A00-B99
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3. B35-B49
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4. B40-
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5. 2023 ICD-10-CM Diagnosis Code B40.9

2023 ICD-10-CM Diagnosis Code B40.9

Blastomycosis, unspecified

2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code

• B40.9 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
• The 2023 edition of ICD-10-CM B40.9 became effective on October 1, 2022.
• This is the American ICD-10-CM version of B40.9 - other international versions of ICD-10 B40.9 may differ.

• Blastomycosis

• A fungal infection caused by inhalation of spores of blastomyces dermatitidis. It presents with flu-like symptoms including fever, chills, cough, pleuritic chest pain and myalgias. It may lead to a chronic granulomatous pulmonary infection and disseminate to other anatomic sites including skin, nervous system and bones.
• A fungal infection that may appear in two forms: 1, a primary lesion characterized by the formation of a small cutaneous nodule and small nodules along the lymphatics that may heal within several months; and 2, chronic granulomatous lesions characterized by thick crusts, warty growths, and unusual vascularity and infection in the middle or upper lobes of the lung.
• Infection caused by fungi of the genus blastomyces.

• 791 Prematurity with major problems
• 793 Full term neonate with major problems
• 867 Other infectious and parasitic diseases diagnoses with mcc
• 868 Other infectious and parasitic diseases diagnoses with cc
• 869 Other infectious and parasitic diseases diagnoses without cc/mcc

Convert B40.9 to ICD-9-CM

• 2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
• 2017 (effective 10/1/2016): No change
• 2018 (effective 10/1/2017): No change
• 2019 (effective 10/1/2018): No change
• 2020 (effective 10/1/2019): No change
• 2021 (effective 10/1/2020): No change
• 2022 (effective 10/1/2021): No change
• 2023 (effective 10/1/2022): No change

• Blastomycosis, blastomycotic B40.9
  • North American B40.9
• Chicago disease B40.9
• Disease, diseased - see also Syndrome
  • Chicago B40.9
• Gilchrist's disease B40.9
• Infection, infected, infective (opportunistic) B99.9
  ICD-10-CM Diagnosis Code B99.9

  Unspecified infectious disease

  2016 2017 2018 2019 2020 2021 2022 2023 Billable/Specific Code
  • Blastomyces, blastomycotic - see also Blastomycosis
    • North American B40.9
• North American blastomycosis B40.9

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.