ICD-10-CM Code A09

Valid for Submission

A09 is a billable code used to specify a medical diagnosis of infectious gastroenteritis and colitis, unspecified. The code is valid for the year 2020 for the submission of HIPAA-covered transactions. The ICD-10-CM code A09 might also be used to specify conditions or terms like acute erosive gastritis, acute gastroenteritis, acute gastroenteritis, acute infectious nonbacterial gastroenteritis, acute infective gastroenteritis, acute ulcerative gastroenteritis complicating pneumonia, etc

Tabular List of Diseases and Injuries

The Tabular List of Diseases and Injuries is a list of ICD-10 codes, organized "head to toe" into chapters and sections with guidance for inclusions, exclusions, descriptions and more. The following references are applicable to the code A09:

Inclusion Terms

Inclusion Terms
These terms are the conditions for which that code is to be used. The terms may be synonyms of the code title, or, in the case of "other specified" codes, the terms are a list of the various conditions assigned to that code. The inclusion terms are not necessarily exhaustive. Additional terms found only in the Alphabetic Index may also be assigned to a code.

• Infectious colitis NOS
• Infectious enteritis NOS
• Infectious gastroenteritis NOS

Type 1 Excludes

Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

• colitis NOS K52.9
• diarrhea NOS R19.7
• enteritis NOS K52.9
• gastroenteritis NOS K52.9
• noninfective gastroenteritis and colitis, unspecified K52.9

Index to Diseases and Injuries

The Index to Diseases and Injuries is an alphabetical listing of medical terms, with each term mapped to one or more ICD-10 code(s). The following references for the code A09 are found in the index:

• - Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) - M19.90
  • - in (due to)
    • - enteritis, infectious NEC - See Also: category M01; - A09

• - Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) - See Also: Enteritis; - K52.9
  • - regional - See: Enteritis, regional, large intestine;
    • - infectious - A09

• - Diarrhea, diarrheal (disease) (infantile) (inflammatory) - R19.7
  • - dysenteric - A09
  • - endemic - A09
  • - epidemic - A09
  • - infectious - A09

• - Disease, diseased - See Also: Syndrome;
  • - diarrheal, infectious NEC - A09

• - Dysentery, dysenteric (catarrhal) (diarrhea) (epidemic) (hemorrhagic) (infectious) (sporadic) (tropical) - A09
  • - arthritis - See Also: category M01; - A09

• - Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) - K52.9
  • - epidemic (infectious) - A09
  • - infectious NOS - A09
  • - septic - A09

• - Enterocolitis - See Also: Enteritis; - K52.9
  • - infectious NEC - A09

• - Gastroenteritis (acute) (chronic) (noninfectious) - See Also: Enteritis; - K52.9
  • - epidemic (infectious) - A09

• - Gastroenteropathy - See Also: Gastroenteritis; - K52.9
  • - infectious - A09

• - Ileitis (chronic) (noninfectious) - See Also: Enteritis; - K52.9
  • - infectious - A09

• - Ileocolitis - See Also: Enteritis; - K52.9
  • - infectious - A09

• - Sigmoiditis - See Also: Enteritis; - K52.9
  • - infectious - A09

• - Ulcer, ulcerated, ulcerating, ulceration, ulcerative
  • - dysenteric - A09

Synonyms

The following clinical terms are approximate synonyms or lay terms that might be used to identify the correct diagnosis code:

• Acute erosive gastritis
• Acute gastroenteritis
• Acute gastroenteritis
• Acute infectious nonbacterial gastroenteritis
• Acute infective gastroenteritis
• Acute ulcerative gastroenteritis complicating pneumonia
• Catarrhal dysentery
• Colitis presumed infectious
• Colitis, enteritis and gastroenteritis presumed infectious
• Diarrhea of presumed infectious origin
• Disease of presumed infectious origin
• Disease of presumed infectious origin
• Disease of presumed infectious origin
• Disease of presumed infectious origin
• Disorder of gastrointestinal tract co-occurrent with human immunodeficiency virus infection
• Dysenteric diarrhea
• Enteritis presumed infectious
• Epidemic diarrhea
• Epidemic gastroenteritis
• Erosive gastritis
• Fungal gastrointestinal infection
• Gastroenteritis presumed infectious
• Gastrointestinal infection
• Ill-defined infectious disease
• Ill-defined infectious disease
• Ill-defined intestinal infection
• Ill-defined intestinal infection
• Ill-defined intestinal infection associated with AIDS
• Infection of digestive system
• Infection of large intestine
• Infectious colitis
• Infectious diarrheal disease
• Infectious disease of digestive tract
• Infectious enteritis
• Infectious gastroenteritis
• Infectious gastroenteritis associated with AIDS
• Infectious gastroenteritis co-occurrent with human immunodeficiency virus infection
• Infective gastritis
• Institution-acquired gastroenteritis
• Institutional environment related disease
• Intestinal infectious disease
• Megacolon co-occurrent and due to infectious colitis
• Megacolon, not Hirschsprung's
• Phlegmonous enteritis
• Pseudo-obstruction of colon
• Purulent enteritis
• Secondary megacolon - acquired
• Suppurative gastritis
• Toddler diarrhea

Diagnostic Related Groups

The ICD-10 code A09 is grouped in the following groups for version MS-DRG V37.0 What are Diagnostic Related Groups?
The Diagnostic Related Groups (DRGs) are a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC). applicable from 10/01/2020 through 09/30/2020.

• 391 - ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITH MCC
• 392 - ESOPHAGITIS, GASTROENTERITIS AND MISCELLANEOUS DIGESTIVE DISORDERS WITHOUT MCC

Convert A09 to ICD-9

• 009.0 - Infectious enteritis NOS (Approximate Flag)

Code Classification

• Certain infectious and parasitic diseases (A00–B99)
  • Intestinal infectious diseases (A00-A09)
    • Infectious gastroenteritis and colitis, unspecified (A09)

Code History

• FY 2016 - New Code, effective from 10/1/2015 through 9/30/2016
  (First year ICD-10-CM implemented into the HIPAA code set)
• FY 2017 - No Change, effective from 10/1/2016 through 9/30/2017
• FY 2018 - No Change, effective from 10/1/2017 through 9/30/2018
• FY 2019 - No Change, effective from 10/1/2018 through 9/30/2019
• FY 2020 - No Change, effective from 10/1/2019 through 9/30/2020

Tools

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