Is ICD-10-CM code A00 billable?

No, A00 (Cholera) is a non-billable ICD-10-CM code. It must be coded to a more specific subcategory before it can be used for reimbursement.

What chapter does ICD-10-CM code A00 belong to?

A00 belongs to Chapter 1 of the ICD-10-CM tabular list: A00–B99 (Certain Infectious and Parasitic Diseases).

A00Not billable, use a more specific code below

Cholera

In Intestinal infectious diseases (A00-A09), chapter 1: Certain Infectious and Parasitic Diseases

3 billable codes under A00: all are a CC; none map to an HCC.A CC or MCC (major CC) is a secondary diagnosis that raises the MS-DRG payment.

Official coding guidelines

From the ICD-10-CM Official Guidelines for Coding and Reporting, FY 2027 (CMS and NCHS). Links open the PDF at the right page.

Rules for coding infections and parasitic diseases, including HIV, organism and drug resistance codes, sepsis and septic shock, MRSA, Zika, and COVID-19.

Human Immunodeficiency Virus (HIV) Infections (page 19)
Infectious agents as the cause of diseases classified to other chapters (page 22)
Infections resistant to antibiotics (page 22)
Sepsis, Severe Sepsis, and Septic Shock (page 23)
Methicillin Resistant Staphylococcus aureus (MRSA) Conditions (page 27)
Zika virus infections (page 28)
Coronavirus infections (page 28)

Read Section I.C.1 (page 19)

All codes under A00

A00 can't be used on a claim. Pick a billable code below; grey headings group them.

A00 MS-DRGs

As the principal diagnosis, all 3 billable codes under A00 group to MS-DRG 371, 372, or 373 (v44.0). Which one applies depends on procedures performed, secondary diagnoses (CC/MCC), and the patient's age and discharge status.

Other codes that refer to A00

Notes on these codes point to A00.

CH10 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH11 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH12 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH13 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH14 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH6 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH7 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH8 Excludes2: certain infectious and parasitic diseases (A00-B99)
CH9 Excludes2: certain infectious and parasitic diseases (A00-B99)
D81.82 Code Also: other infections (A00-B99)
L97 Excludes2: specific infections classified to A00-B99
L98.4 Excludes2: specific infections classified to A00-B99
L98.A Excludes2: specific infections classified to A00-B99
P00.2 Includes: Newborn affected by maternal infectious disease classifiable to A00-B99, J09 and J10
P35-P39 Excludes2: infectious diseases not specific to the perinatal period (A00-B99, J09, J10.-)
P35-P39 Excludes2: intestinal infectious disease (A00-A09)
P37 Excludes2: infectious neonatal diarrhea (A00-A09)
T88.7 Excludes1: specified adverse effects of drugs and medicaments (A00-R94 and T80-T88.6, T88.8)
Z83.1 Includes: Conditions classifiable to A00-B19, B25-B94, B99
Z86.1 Includes: Conditions classifiable to A00-B89, B99

About the condition

Plain-language background from MedlinePlus (National Library of Medicine), not coding guidance.

Cholera

Cholera is a bacterial infection that causes diarrhea. The cholera bacterium is usually found in water or food that has been contaminated by feces (poop). Cholera is rare in the US. You may get it if you travel to parts of the world with poor water and sewage treatment. Outbreaks can also happen after disasters. The disease is not likely to spread directly from person to person.

Code history

Valid since FY2016, when ICD-10-CM took effect on October 1, 2015. No changes since.