ICD-10-CM 2027
ICD-10 code for Worm fever
From the official ICD-10-CM alphabetic index entry “Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) › worm”. Page updated September 29, 2026.
About coding Worm fever
The ICD-10-CM code for Worm fever is B83.9 (Helminthiasis, unspecified).
Within B83, choose B83.9 (Helminthiasis, unspecified) only when documentation doesn't support a more specific option: visceral larva migrans (B83.0), Gnathostomiasis (B83.1), angiostrongyliasis due to Parastrongylus cantonensis (B83.2), Syngamiasis (B83.3), internal hirudiniasis (B83.4) and other specified helminthiases (B83.8).
Don't report B83.9 together with the conditions in its Excludes1 note: intestinal helminthiasis NOS (B82.0).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
Don't confuse with (Excludes1 for B83.9)
- intestinal helminthiasis NOS (B82.0)
Common questions about Worm fever ICD-10 codes
What is the ICD-10 code for Worm fever?
- B83.9 — Helminthiasis, unspecified.
Is B83.9 billable?
- Yes. B83.9 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can B83.9 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict B83.9 as a principal diagnosis.
Is B83.9 a CC or MCC?
- No. B83.9 is neither a CC nor an MCC under MS-DRG v44.0.