B81.1 ICD-10-CM Code: Intestinal capillariasis
B81.1 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · free HCC coding tools
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Helminthiases (B65-B83)
B81.1
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceIntestinal capillariasis
A parasitic infection caused by capillaria worms that damage the small intestine, causing severe diarrhea, malabsorption, and protein loss.
CMS-HCC V28
N/A—
Not mapped
CMS-HCC V24
HistoricalHistorical
Not used for CY2026 payment
ACA/HHS
N/A—
Not mapped
ESRD/PACE
N/A—
Not mapped
RXHCC
N/A—
Not mapped
Code Book Path
Inclusion Terms
Official- Capillariasis NOS
- Infection due to Capillaria philippinensis
Excludes 2
Official- hepatic capillariasis (B83.8)
- carrier or suspected carrier of infectious disease (Z22.-)Inherited from A00-B99
- infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)Inherited from A00-B99
- infectious and parasitic diseases specific to the perinatal period (P35-P39)Inherited from A00-B99
- influenza and other acute respiratory infections (J00-J22)Inherited from A00-B99
Related Codes
Includes
Official- diseases generally recognized as communicable or transmissibleInherited from A00-B99
Excludes 1
Official- certain localized infections - see body system-related chaptersInherited from A00-B99, B81
- angiostrongyliasis due to:Inherited from A00-B99, B81
- Angiostrongylus cantonensis (B83.2)Inherited from A00-B99, B81
- Parastrongylus cantonensis (B83.2)Inherited from A00-B99, B81
Code First
OfficialNo Code First sequencing instructions are included in this display for B81.1. Check the code and parent instructions in the Code Book.
Use Additional
Official- code to identify resistance to antimicrobial drugs (Z16.-)Inherited from A00-B99
Code Also
OfficialNo Code Also instructions are included in this display for B81.1. Check the code and parent instructions in the Code Book.
Buddy Documentation Tip
Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →
Is B81.1 an HCC code?
No. B81.1 is a billable ICD-10-CM code with no mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models.
- Code
- B81.1
- Description
- Intestinal capillariasis
- HCC (V28)
- No CMS-HCC V28 mapping
- RAF reference coefficient
- —
- Billable
- Yes
- Payment year
- 2026
Coder workflow notes
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This code does not map to an HCC category in any model (V28, V24, ESRD, RxHCC).
What This Code Means
B81.1 is the ICD-10-CM diagnosis code for intestinal capillariasis. A parasitic infection caused by capillaria worms that damage the small intestine, causing severe diarrhea, malabsorption, and protein loss. B81.1 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering helminthiases (b65-b83).
B81.1 is a billable ICD-10-CM code, but the current payload does not show a mapping under the CMS-HCC V28 or V24 community payment models, and none under the ESRD, Part D RxHCC, or HHS-HCC models. Do not assign risk adjustment value from this page when no source-backed mapping is shown; verify the applicable model and payment year.
This infection is rare in developed countries; document geographic origin or travel history.
HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for B81.1 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •This infection is rare in developed countries; document geographic origin or travel history
- •Severe infections can cause protein-losing enteropathy; document nutritional complications if present
Excludes 2, Not included here, may code separately
- hepatic capillariasis (B83.8)