A07.9 ICD-10-CM Code: Protozoal intestinal disease, unspecified
HCC Buddy Code Card
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FY 2026 Apr update / Certain infectious and parasitic diseases (A00-B99) / Intestinal infectious diseases (A00-A09)
A07.9
Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidanceProtozoal intestinal disease, unspecified
This code describes an infection of the intestines caused by parasitic organisms called protozoa, but the specific type of protozoa has not been identified or documented. Common symptoms include diarrhea, abdominal pain, and nausea.
CMS-HCC V28
00
RAF 0
CMS-HCC V24
00
RAF 0
ACA/HHS
00
RAF 0
ESRD/PACE
00
RAF 0
RXHCC
00
RAF 0
Code Trumping
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Code Book Path
Inclusion Terms
Official- Flagellate diarrhea
- Protozoal colitis
- Protozoal diarrhea
- Protozoal dysentery
Excludes 2
OfficialICD-10-CM does not list Excludes 2 notes for A07.9 in this effective period.
Related Child Codes
Includes
OfficialICD-10-CM does not list Includes notes for A07.9 in this effective period.
Excludes 1
OfficialICD-10-CM does not list Excludes 1 notes for A07.9 in this effective period.
Code First
OfficialICD-10-CM does not list Code First sequencing instructions for A07.9 in this effective period.
Use Additional
OfficialICD-10-CM does not list Use Additional Code instructions for A07.9 in this effective period.
Code Also
OfficialICD-10-CM does not list Code Also instructions for A07.9 in this effective period.
Buddy Documentation Tip
Last updated: FY2026 ICD-10-CM Apr update, Apr 1, 2026 through Sep 30, 2026. CMS-HCC V28 is 100% phased in for payment year 2026.
Is A07.9 an HCC code?
No. A07.9 is a billable ICD-10-CM code but does not map to any HCC category in V28, V24, ESRD, or RxHCC.
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
A07.9 is the ICD-10-CM diagnosis code for protozoal intestinal disease, unspecified. This code describes an infection of the intestines caused by parasitic organisms called protozoa, but the specific type of protozoa has not been identified or documented. Common symptoms include diarrhea, abdominal pain, and nausea. A07.9 sits in the ICD-10-CM chapter for certain infectious and parasitic diseases (a00-b99), within the section covering intestinal infectious diseases (a00-a09).
A07.9 is a billable ICD-10-CM code but does not map to a payment HCC under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can be reported on Medicare Advantage encounter data submissions but it does not contribute to a beneficiary's RAF score and therefore does not affect risk-adjusted payments to the plan.
Use this code only when the specific protozoal organism cannot be determined; if the organism is identified (such as giardia, cryptosporidium, or entamoeba), use the more specific A07.0-A07.8 codes instead.
HCC Buddy maintains structured V28 and V24 mapping, RAF weights, and MEAT documentation criteria for A07.9 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.
Coding Tips
- •Use this code only when the specific protozoal organism cannot be determined; if the organism is identified (such as giardia, cryptosporidium, or entamoeba), use the more specific A07.0-A07.8 codes instead
- •Document any associated symptoms like diarrhea (A09) or dehydration to provide a complete clinical picture, and query the provider if additional diagnostic testing results become available