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A07.3

A07.3: Isosporiasis

Billable / specific codeICD-10-CM

A07.3 is a billable, specific ICD-10-CM code for isosporiasis. It is valid for submission on a claim.

Check A07.3 with the rest of the claim: free scrubber

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

  • Infection due to Isospora belli and Isospora hominis
  • Intestinal coccidiosis
  • Isosporosis

Other codes that can never be billed with A07.3

Their own Excludes1 notes name this code, so the conflict is not listed above.

  • A06Amebiasis
  • B60Other protozoal diseases, not elsewhere classified

Risk adjustment

No CMS-HCC V28 category: this code does not change a RAF score.

Medicare coverage

A07.3 is named in 2 Medicare coverage policies: 2 listing it as supporting medical necessity. Which one applies depends on your Medicare contractor.

  • A56456Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy
  • A56632Billing and Coding: Colonoscopy/Sigmoidoscopy/Proctosigmoidoscopy

Alphabetic index entries that lead here

  • Coccidiosis(intestinal)
  • Isosporiasis, isosporosis
  • Colitis›coccidial
  • Diarrhea, diarrheal›coccidial
  • Dysentery, dysenteric›coccidial
  • Enteritis›coccidial
  • Infection, infected, infective›Isospora belli or hominis
  • Infestation›coccidial

Code history

Unchanged in every release from FY2024 to FY2027.

Other codes under A07

ICD-10-CMFY2027· effective October 1, 2026

Loaded directly from the CMS/NCHS ICD-10-CM public-domain release: see data sources and our editorial policy. If this page disagrees with the CMS tabular list, this page is wrong. Reference information for professional coders; not medical or billing advice.