Filariasis (B74) ICD-10-CM
The B74 code range covers filariasis with 8 ICD-10-CM diagnosis codes. 7 of them are billable and valid for claim submission in fiscal year 2027, and the category headers group them but cannot themselves be billed.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Codes in the B74 Range 8 codes · 7 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the B74 range.
Dirofilariasis
Infection with nematodes of the genus DIROFILARIA, usually in animals, especially dogs, but occasionally in man.
Filariasis
Infections with nematodes of the superfamily FILARIOIDEA. The presence of living worms in the body is mainly asymptomatic but the death of adult worms leads to granulomatous inflammation and permanent fibrosis. Organisms of the genus Elaeophora infect wild elk and domestic sheep causing ischemic necrosis of the brain, blindness, and dermatosis of the face.
Loiasis
A parasitic infection caused by the nematode Loa loa. The vector in the transmission of this infection is the horsefly (Tabanus) or the deerfly or mango fly (Chrysops). The larvae may be seen just beneath the skin or passing through the conjunctiva. Eye lesions are not uncommon. The disease is generally mild and painless.
Mansonelliasis
Infection with nematodes of the genus MANSONELLA. Symptoms include pruritus, headache, and articular swelling.
About the B74 Code Range
Filariasis is an infection with filarioid nematodes, a group of roundworms. It belongs to the helminthiases, or worm infections.
The subdivisions distinguish infections due to Wuchereria bancrofti (B74.0), Brugia malayi (B74.1), and Brugia timori (B74.2). Separate codes identify loiasis (B74.3) and mansonelliasis (B74.4). Other filariases fall under B74.8, while B74.9 identifies filariasis without a specified type.
Questions About This Page
How many billable codes are in the B74 range?
Of the 8 codes in this range, 7 are billable and valid for claim submission from October 1, 2026 through September 30, 2027. Category header codes group them but cannot be reported on claims.
What does the B74 range classify?
The range classifies filariasis. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2027 ICD-10-CM Tabular List and order file, effective October 1, 2026 through September 30, 2027.
