ICD-10-CM 2027
ICD-10 code for Helminth infestation
From the official ICD-10-CM alphabetic index entry “Infestation › helminth”. Page updated September 29, 2026.
About coding Helminth infestation
The ICD-10-CM code for Helminth infestation is B83.9 (Helminthiasis, unspecified). The official index lists 18 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on B83.9.
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.
More specific Helminth infestation codes (official index)
- angiostrongyliasis B83.2 — Angiostrongyliasis due to Parastrongylus cantonensis
- intestinal B81.3 — Intestinal angiostrongyliasis
- gnathostomiasis B83.1 — Gnathostomiasis
- hirudiniasis, internal B83.4 — Internal hirudiniasis
- intestinal B82.0 — Intestinal helminthiasis, unspecified
- angiostrongyliasis B81.3 — Intestinal angiostrongyliasis
- anisakiasis B81.0 — Anisakiasis
- ascariasis
- capillariasis B81.1 — Intestinal capillariasis
- cysticercosis
- diphyllobothriasis
- dracunculiasis B72 — Dracunculiasis
- echinococcus
- enterobiasis B80 — Enterobiasis
- filariasis
- fluke
- hookworm
- mixed (types classifiable to more than one of the titles B65.0-B81.3 and B81.8) B81.4 — Mixed intestinal helminthiases
- onchocerciasis
- schistosomiasis
- specified
- cestode NEC
- type NEC B81.8 — Other specified intestinal helminthiases
- strongyloidiasis
- taenia
- trichinellosis B75 — Trichinellosis
- trichostrongyliasis B81.2 — Trichostrongyliasis
- trichuriasis B79 — Trichuriasis
- specified type NEC B83.8 — Other specified helminthiases
- syngamiasis B83.3 — Syngamiasis
- visceral larva migrans B83.0 — Visceral larva migrans
Don't confuse with (Excludes1 for B83.9)
- intestinal helminthiasis NOS (B82.0)
Common questions about Helminth infestation ICD-10 codes
What is the ICD-10 code for Helminth infestation?
- B83.9 — Helminthiasis, unspecified. More specific codes apply when the documentation supports them: B83.2, B81.3, B83.1, B83.4 and others below.
What is the ICD-10 code for angiostrongyliasis helminth infestation?
- B83.2 — Angiostrongyliasis due to Parastrongylus cantonensis.
What is the ICD-10 code for gnathostomiasis helminth infestation?
- B83.1 — Gnathostomiasis.
What is the ICD-10 code for intestinal helminth infestation?
- B82.0 — Intestinal helminthiasis, unspecified.
What is the ICD-10 code for syngamiasis helminth infestation?
- B83.3 — Syngamiasis.
What is the ICD-10 code for visceral larva migrans helminth infestation?
- B83.0 — Visceral larva migrans.
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.