2027 ICD-10-CM Diagnosis Code A07.8Other specified protozoal intestinal diseases

ICD-10-CM Codes›A00–B99›A00-A09›A07

ICD-10-CM A07.8
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

A07.8 is a billable ICD-10-CM diagnosis code for other specified protozoal intestinal diseases. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 371 through 373. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Intestinal infection; and Parasitic, other specified and unspecified infections.

Code Identity

ICD-10-CM Code
A07.8
Billable Status
Yes — Valid for Submission
Code Describes
Other specified protozoal intestinal diseases
Short Description
Other specified protozoal intestinal diseases
Same as the full description in the CMS dataset.
Parent Code
A07
Other protozoal intestinal diseases

Code Classification

ChapterA00–B99Certain infectious and parasitic diseases
SectionA00-A09Intestinal infectious diseases
CategoryA07Other protozoal intestinal diseases
This CodeA07.8Other specified protozoal intestinal diseases

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Chilomastix mesnili infection
  • Dientamoeba fragilis infection
  • Disease caused by Chilomastigidae
  • Disease caused by Monocercomonadidae
  • Disease caused by Retortamonadidae
  • Disease caused by Sarcocystidae
  • Embadomoniasis
  • Infection by Chilomastix
  • Infection by Enteromonas
  • Infection by Enteromonas hominis
  • Infection by Retortamonas intestinalis
  • Infection by Sarcocystis lindemanni
  • Intestinal flagellate infection
  • Intestinal infection by Trichomonas vaginalis
  • Intestinal microsporidiosis
  • Intestinal trichomoniasis
  • Psorospermiasis
  • Sarcosporidiosis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to A07.8: its own notes plus those printed at Chapter 1. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • diseases generally recognized as communicable or transmissible

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Intestinal microsporidiosis
  • Intestinal trichomoniasis
  • Sarcocystosis
  • Sarcosporidiosis

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • carrier or suspected carrier of infectious disease (Z22.-)
  • certain localized infections - see body system-related chapters
  • infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)
  • infectious and parasitic diseases specific to the perinatal period (P35-P39)
  • influenza and other acute respiratory infections (J00-J22)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From Chapter 1 (A00-B99) Certain infectious and parasitic diseases applies to 1,068 codes
  • code to identify resistance to antimicrobial drugs (Z16.-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name A07.8, its category, or a range that includes it.

Excludes1 3

These codes carry an Excludes1 note naming A07.8: they are not reported together with it, unless the two conditions are unrelated.

  • B60 Other protozoal diseases, not elsewhere classified
    intestinal microsporidiosis (A07.8)
  • A06 Amebiasis
    other protozoal intestinal diseases (A07.-) names A07.-, which includes this code
  • Block B50-B64 Protozoal diseases
    other protozoal intestinal diseases (A07.-) names A07.-, which includes this code

Excludes2 3

These codes carry an Excludes2 note naming A07.8: its condition is not part of those codes, and both may be reported when the patient has both.

  • A59 Trichomoniasis
    intestinal trichomoniasis (A07.8)
  • Block P35-P39 Infections specific to the perinatal period
    intestinal infectious disease (A00-A09) names A00-A09, which includes this code
  • P37 Other congenital infectious and parasitic diseases
    infectious neonatal diarrhea (A00-A09) names A00-A09, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR DIG001
Intestinal infection
Default principal diagnosis: inpatient Yes · outpatient Yes
CCSR INF009
Parasitic, other specified and unspecified infections
Default principal diagnosis: inpatient No · outpatient No

Clinical InformationClinical

  • Sarcocystosis

    infection of the striated muscle of mammals by parasites of the genus sarcocystis. disease symptoms such as vomiting, diarrhea, muscle weakness, and paralysis are produced by sarcocystin, a toxin produced by the organism.

Patient EducationClinical

Gastroenteritis

Gastroenteritis is an inflammation of the lining of the stomach and intestines. The main symptoms include vomiting and diarrhea. It is usually not serious in healthy people, but it can sometimes lead to dehydration or cause severe symptoms.

The full article covers:

  • What is gastroenteritis?
  • What causes gastroenteritis?
  • What are the symptoms of gastroenteritis?
  • How is gastroenteritis diagnosed?
  • What are the treatments for gastroenteritis?
  • Can gastroenteritis be prevented?

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert A07.8 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
007.3 Intest trichomoniasis
Approximate The match is approximate rather than exact.
ICD-9-CM
007.8 Protozoal intest dis NEC
Approximate The match is approximate rather than exact.
ICD-9-CM
136.5 Sarcosporidiosis
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About A07.8Overview

What is the ICD-10 code for other specified protozoal intestinal diseases?

The ICD-10-CM code for other specified protozoal intestinal diseases is A07.8 (sometimes written as A078). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is A07.8 (Other protozoal intestinal diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report other specified protozoal intestinal diseases on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does A07.8 group to?

When other specified protozoal intestinal diseases is the principal diagnosis on an inpatient stay, it groups to MS-DRG 372, 371, 373, with relative weights from 0.6945 to 1.7087 depending on complications. Higher weights mean higher Medicare reimbursement.

Is A07.8 a CC or MCC?

CMS lists A07.8 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.

What is the ICD-9 equivalent of A07.8?

Under the General Equivalence Mappings, other specified protozoal intestinal diseases converts to ICD-9-CM 007.3 (intest trichomoniasis), 007.8 (protozoal intest dis NEC), and 136.5 (sarcosporidiosis). The mapping is approximate, so confirm the match fits the documentation.