ICD-10-CM Codes
A00-B99
A00-A09
A09-
2023 ICD-10-CM Diagnosis Code A09

2023 ICD-10-CM Diagnosis Code A09

Infectious gastroenteritis and colitis, unspecified

2016

2017

2018

2019

2020

2021

2022

2023

Billable/Specific Code

A09 is a billable/specific ICD-10-CM code that can be used to indicate a diagnosis for reimbursement purposes.
The 2023 edition of ICD-10-CM A09 became effective on October 1, 2022.
This is the American ICD-10-CM version of A09 - other international versions of ICD-10 A09 may differ.

Applicable To

Infectious colitis NOS
Infectious enteritis NOS
Infectious gastroenteritis NOS

Type 1 Excludes

Type 1 Excludes Help

A type 1 excludes note is a pure excludes. It means "not coded here". A type 1 excludes note indicates that the code excluded should never be used at the same time as A09. A type 1 excludes note is for used for when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.

colitis NOS (
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Type 1 Excludes
- diarrhea NOS (R19.7)
- functional diarrhea (K59.1)
- infectious gastroenteritis and colitis NOS (A09)
- neonatal diarrhea (noninfective) (P78.3)
- psychogenic diarrhea (F45.8)
K52.9
)
diarrhea NOS (
ICD-10-CM Diagnosis Code R19.7
Diarrhea, unspecified
Applicable To
- Diarrhea NOS
Type 1 Excludes
- functional diarrhea (K59.1)
- neonatal diarrhea (P78.3)
- psychogenic diarrhea (F45.8)
R19.7
)
enteritis NOS (
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Type 1 Excludes
- diarrhea NOS (R19.7)
- functional diarrhea (K59.1)
- infectious gastroenteritis and colitis NOS (A09)
- neonatal diarrhea (noninfective) (P78.3)
- psychogenic diarrhea (F45.8)
K52.9
)
gastroenteritis NOS (
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Type 1 Excludes
- diarrhea NOS (R19.7)
- functional diarrhea (K59.1)
- infectious gastroenteritis and colitis NOS (A09)
- neonatal diarrhea (noninfective) (P78.3)
- psychogenic diarrhea (F45.8)
K52.9
)
noninfective gastroenteritis and colitis, unspecified (
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Type 1 Excludes
- diarrhea NOS (R19.7)
- functional diarrhea (K59.1)
- infectious gastroenteritis and colitis NOS (A09)
- neonatal diarrhea (noninfective) (P78.3)
- psychogenic diarrhea (F45.8)
K52.9
)

The following code(s) above A09 contain annotation back-references

Annotation Back-References

In this context, annotation back-references refer to codes that contain:

Applicable To annotations, or
Code Also annotations, or
Code First annotations, or
Excludes1 annotations, or
Excludes2 annotations, or
Includes annotations, or
Note annotations, or
Use Additional annotations

that may be applicable to A09:

A00-B99
2023 ICD-10-CM Range A00-B99
Certain infectious and parasitic diseases
Includes
- diseases generally recognized as communicable or transmissible
Type 1 Excludes
- certain localized infections - see body system-related chapters
Type 2 Excludes
- carrier or suspected carrier of infectious disease (Z22.-)
- 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 to identify resistance to antimicrobial drugs (Z16.-)
Certain infectious and parasitic diseases

Approximate Synonyms

Infectious colitis
Infectious diarrhea
Infectious diarrheal disease
Infectious gastroenteritis
Post-dysenteric arthropathy
Post-dysenteric arthropathy of left ankle and/or foot
Post-dysenteric arthropathy of left elbow
Post-dysenteric arthropathy of left hand
Post-dysenteric arthropathy of left hip
Post-dysenteric arthropathy of left knee
Post-dysenteric arthropathy of left shoulder
Post-dysenteric arthropathy of left wrist
Post-dysenteric arthropathy of vertebrae
Post-dysenteric reactive arthropathy of multiple sites
Postdysenteric arthritis of left ankle
Postdysenteric arthritis of left elbow
Postdysenteric arthritis of left hand
Postdysenteric arthritis of left hip
Postdysenteric arthritis of left knee
Postdysenteric arthritis of left shoulder
Postdysenteric arthritis of left wrist
Postdysenteric arthritis of multiple sites
Postdysenteric arthritis of vertebra
Postdysenteric arthropathy
Traveler's diarrhea
Travelers diarrhea

Clinical Information

A viral or bacterial infectious process affecting the large intestine.

ICD-10-CM A09 is grouped within Diagnostic Related Group(s) (MS-DRG v40.0):

391 Esophagitis, gastroenteritis and miscellaneous digestive disorders with mcc
392 Esophagitis, gastroenteritis and miscellaneous digestive disorders without mcc

Convert A09 to ICD-9-CM

Code History

2016 (effective 10/1/2015): New code (first year of non-draft ICD-10-CM)
2017 (effective 10/1/2016): No change
2018 (effective 10/1/2017): No change
2019 (effective 10/1/2018): No change
2020 (effective 10/1/2019): No change
2021 (effective 10/1/2020): No change
2022 (effective 10/1/2021): No change
2023 (effective 10/1/2022): No change

Code annotations containing back-references to A09:

Type 1 Excludes: K52.9

ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
- Colitis NOS
- Enteritis NOS
- Gastroenteritis NOS
- Ileitis NOS
- Jejunitis NOS
- Sigmoiditis NOS
Type 1 Excludes
- diarrhea NOS (R19.7)
- functional diarrhea (K59.1)
- infectious gastroenteritis and colitis NOS (A09)
- neonatal diarrhea (noninfective) (P78.3)
- psychogenic diarrhea (F45.8)

Diagnosis Index entries containing back-references to A09:

Arthritis, arthritic (acute) (chronic) (nonpyogenic) (subacute) M19.90
ICD-10-CM Diagnosis Code M19.90
Unspecified osteoarthritis, unspecified site
Applicable To
Arthrosis NOS
Arthritis NOS
Osteoarthritis NOS
- in (due to)
  - enteritis, infectious NEC A09 - see also category M01
Colitis (acute) (catarrhal) (chronic) (noninfective) (hemorrhagic) K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- regional - see Enteritis, regional, large intestine
  - infectious A09
Diarrhea, diarrheal (disease) (infantile) (inflammatory) R19.7
ICD-10-CM Diagnosis Code R19.7
Diarrhea, unspecified
Applicable To
Diarrhea NOS
Type 1 Excludes
functional diarrhea (K59.1)
neonatal diarrhea (P78.3)
psychogenic diarrhea (F45.8)
- 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 A09 - see also category M01
Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) K52.9
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious NOS A09
- epidemic A09 (infectious)
- septic A09
Enterocolitis K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious NEC A09
Gastroenteritis (acute) (chronic) (noninfectious) K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- epidemic A09 (infectious)
Gastroenteropathy K52.9
- see also Gastroenteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious A09
Ileitis (chronic) (noninfectious) K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious A09
Ileocolitis K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious A09
Sigmoiditis K52.9
- see also Enteritis
ICD-10-CM Diagnosis Code K52.9
Noninfective gastroenteritis and colitis, unspecified
Applicable To
Colitis NOS
Enteritis NOS
Gastroenteritis NOS
Ileitis NOS
Jejunitis NOS
Sigmoiditis NOS
Type 1 Excludes
diarrhea NOS (R19.7)
functional diarrhea (K59.1)
infectious gastroenteritis and colitis NOS (A09)
neonatal diarrhea (noninfective) (P78.3)
psychogenic diarrhea (F45.8)
- infectious A09
Ulcer, ulcerated, ulcerating, ulceration, ulcerative
- dysenteric A09

ICD-10-CM Codes Adjacent To A09

A08.1 Acute gastroenteropathy due to Norwalk agent and other small round viruses

A08.11 Acute gastroenteropathy due to Norwalk agent

A08.19 Acute gastroenteropathy due to other small round viruses

A08.2 Adenoviral enteritis

A08.3 Other viral enteritis

A08.31 Calicivirus enteritis

A08.32 Astrovirus enteritis

A08.39 Other viral enteritis

A08.4 Viral intestinal infection, unspecified

A08.8 Other specified intestinal infections

A09 Infectious gastroenteritis and colitis, unspecified

A15 Respiratory tuberculosis

A15.0 Tuberculosis of lung

A15.4 Tuberculosis of intrathoracic lymph nodes

A15.5 Tuberculosis of larynx, trachea and bronchus

A15.6 Tuberculous pleurisy

A15.7 Primary respiratory tuberculosis

A15.8 Other respiratory tuberculosis

A15.9 Respiratory tuberculosis unspecified

A17 Tuberculosis of nervous system

A17.0 Tuberculous meningitis

Reimbursement claims with a date of service on or after October 1, 2015 require the use of ICD-10-CM codes.

2023 ICD-10-CM Diagnosis Code A09

Infectious gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Diarrhea, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Certain infectious and parasitic diseases

Noninfective gastroenteritis and colitis, unspecified

Unspecified osteoarthritis, unspecified site

Noninfective gastroenteritis and colitis, unspecified

Diarrhea, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified

Noninfective gastroenteritis and colitis, unspecified