Is ICD-10-CM code B39 billable?

No, B39 (Histoplasmosis) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code B39 belong to?

B39 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

B39Not billable, use a more specific code below

Histoplasmosis

In Mycoses (B35-B49), chapter 1: Certain Infectious and Parasitic Diseases

7 billable codes under B39: 3 are an MCC, 1 is a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Instructional notes

Code first: code the underlying condition first, then this code

associated AIDS (B20)

Use additional code: add a second code for this, listed after this one

code for any associated manifestations, such as:
endocarditis (I39)
meningitis (G02)
pericarditis (I32)
retinitis (H32)

Also applies, from Mycoses (B35-B49)

These notes sit on B35-B49 and apply to every code under it, including B39.

Excludes2: not included here, code separately if applicable

hypersensitivity pneumonitis due to organic dust (J67.-)
mycosis fungoides (C84.0-)

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.

Human Immunodeficiency Virus (HIV) Infections (page 19)
Infectious agents as the cause of diseases classified to other chapters (page 22)
Infections resistant to antibiotics (page 22)
Sepsis, Severe Sepsis, and Septic Shock (page 23)
Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
Zika virus infections (page 28)
Coronavirus infections (page 28)

Read Section I.C.1 (page 19)

All codes under B39

B39 can't be used on a claim. Pick a billable code below; grey headings group them.

B39 MS-DRGs

As the principal diagnosis, the billable codes under B39 group to these 11 MS-DRGs (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

DRG 974 HIV with Major Related Condition with MCC (7 of 7 codes)
DRG 975 HIV with Major Related Condition with CC (7 of 7 codes)
DRG 976 HIV with Major Related Condition without CC/MCC (7 of 7 codes)
DRG 867 Other Infectious and Parasitic Diseases Diagnoses with MCC (4 of 7 codes)
DRG 868 Other Infectious and Parasitic Diseases Diagnoses with CC (4 of 7 codes)
DRG 869 Other Infectious and Parasitic Diseases Diagnoses without CC/MCC (4 of 7 codes)
DRG 177 Respiratory Infections and Inflammations with MCC (3 of 7 codes)
DRG 178 Respiratory Infections and Inflammations with CC (3 of 7 codes)
DRG 179 Respiratory Infections and Inflammations without CC/MCC (3 of 7 codes)
DRG 791 Prematurity with Major Problems (3 of 7 codes)
DRG 793 Full Term Neonate with Major Problems (3 of 7 codes)

Other codes that refer to B39

Notes on these codes point to B39.

H32 Code First: histoplasmosis (B39.-)

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Histoplasmosis

Histoplasmosis is an infection caused by a fungus called Histoplasma. This fungus is common in the central and eastern United States, especially around the Ohio and Mississippi River valleys. It can also be found in parts of Central and South America, Africa, Asia, and Australia. It lives in the environment, especially in soil that contains large amounts of bat or bird droppings (poop).

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.