ICDcodes.org
FY2027

A05.9 — Bacterial foodborne intoxication, unspecified

BillableUnspecified

Is A05.9 billable?

Yes, but A05.9 is an unspecified code. A05.9 is a valid, billable ICD-10-CM code for encounters from October 1, 2026 through September 30, 2027. However, A05.9 is an unspecified or catch-all code. Payers apply additional scrutiny to unspecified codes and many deny them when the medical record supports a more specific option, so check the documentation before selecting A05.9 — the more specific alternatives are listed below.

A05.9 at a glance

CodeA05.9
DescriptionBacterial foodborne intoxication, unspecified
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does A05.9 group to?

A05.9 sits in MDC 06 and helps define the logic of 2 MS-DRGs (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 391Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders with MCCmedical
  • 392Esophagitis, Gastroenteritis and Miscellaneous Digestive Disorders without MCCmedical

How is A05.9 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to A05.9. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Creotoxism
  • Kreotoxism
  • Indigestion › due to decomposed food NOS (acid) (bilious) (functional)
  • Intoxication › foodborne
  • Poisoning › bacterial toxins (acute)
  • Poisoning › food NEC (acute)
  • Poisoning › kreotoxism, food (acute)
  • Intoxication › foodborne › bacterial
  • Poisoning › epidemic, fish › bacterial (acute)
  • Intoxication › foodborne › due to › bacterium

Excludes1 — never code together — inherited from A05

The conditions below can never be reported together with A05.9 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • Clostridium difficile foodborne intoxication and infection (A04.7-)
  • Escherichia coli infection (A04.0-A04.4)
  • listeriosis (A32.-)
  • salmonella foodborne intoxication and infection (A02.-)
  • toxic effect of noxious foodstuffs (T61-T62)

Use additional code — inherited from Chapter 1

Report an additional code alongside A05.9 to fully describe the condition. A05.9 is sequenced first.

  • code to identify resistance to antimicrobial drugs (Z16.-)

Excludes2 — not included here — inherited from Chapter 1

The conditions below are not part of A05.9, but a patient may have both at the same time. When documentation supports it, A05.9 and the excluded code may both be reported.

  • 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)

How long has A05.9 existed?

A05.9 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which conditions are coded to A05.9?

What other codes are in the A05 family? (7)