2027 ICD-10-CM Diagnosis Code A05.1Botulism food poisoning
ICD-10-CM Codes›A00–B99›A00-A09›A05
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A05.1 is a billable ICD-10-CM diagnosis code for botulism food poisoning. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 867 through 869. 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 7 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Foodborne intoxications.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Adult infection of intestine caused by Clostridium botulinum
- Adult intestinal botulism
- Autonomic disorder due to botulism
- Disorder of autonomic nervous system due to infectious disease
- Disorder of neuromuscular junction caused by botulinum toxin
- Foodborne botulism
- Foodborne botulism, type A
- Foodborne botulism, type B
- Foodborne botulism, type E
- Foodborne botulism, type F
- Infection caused by Clostridium botulinum
- Infection of intestine caused by Clostridium botulinum
- Intestinal botulism
- Poisoning caused by Clostridium botulinum toxin
- Toxic neuromuscular junction disorder
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A05.1: its own notes plus those printed at A05 and 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.
- 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.
- Botulism NOS
- Classical foodborne intoxication due to Clostridium botulinum
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
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.
- 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.
- 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 A05.1, its category, or a range that includes it.
Excludes1 6
These codes carry an Excludes1 note naming A05.1: they are not reported together with it, unless the two conditions are unrelated.
- A48.5 Other specified botulismfood poisoning due to toxins of Clostridium botulinum (A05.1)
- G70 Myasthenia gravis and other myoneural disordersbotulism (A05.1, A48.51-A48.52)
- A04 Other bacterial intestinal infectionsbacterial foodborne intoxications, NEC (A05.-) names A05.-, which includes this code
- T61 Toxic effect of noxious substances eaten as seafoodbacterial foodborne intoxications (A05.-) names A05.-, which includes this code
- T62 Toxic effect of other noxious substances eaten as foodbacterial food borne intoxications (A05.-) names A05.-, which includes this code
- T78.1 Other adverse food reactions, not elsewhere classifiedbacterial food borne intoxications (A05.-) names A05.-, which includes this code
Excludes2 2
These codes carry an Excludes2 note naming A05.1: its condition is not part of those codes, and both may be reported when the patient has both.
- Block P35-P39 Infections specific to the perinatal period
- P37 Other congenital infectious and parasitic diseases
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Poisoning (acute) See Also: Table of Drugs and Chemicals;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Botulism
a disease caused by potent protein neurotoxins produced by clostridium botulinum which interfere with the presynaptic release of acetylcholine at the neuromuscular junction. clinical features include abdominal pain, vomiting, acute paralysis (including respiratory paralysis), blurred vision, and diplopia. botulism may be classified into several subtypes (e.g., food-borne, infant, wound, and others). (from adams et al., principles of neurology, 6th ed, p1208)
Patient EducationClinical
Botulism
Botulism is a rare but serious illness. The cause is a toxin (poison) made by a bacterium called Clostridium botulinum. It occurs naturally in soil.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A05.1 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A05.1Overview
What is the ICD-10 code for botulism food poisoning?
The ICD-10-CM code for botulism food poisoning is A05.1 (sometimes written as A051). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A05.1 a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report botulism food poisoning on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A05.1 group to?
When botulism food poisoning is the principal diagnosis on an inpatient stay, it groups to MS-DRG 867, 869, 868, with relative weights from 0.6784 to 2.1855 depending on complications. Higher weights mean higher Medicare reimbursement.
Is A05.1 a CC or MCC?
CMS lists A05.1 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 7 closely related codes in its exclusion list.
Can A05.1 be reported with A48.51?
Not as a rule. The Excludes1 note on A05.1 lists "infant botulism (A48.51)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
