2027 ICD-10-CM Diagnosis Code A28.8Other specified zoonotic bacterial diseases, not elsewhere classified
ICD-10-CM Codes›A00–B99›A20-A28›A28
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
A28.8 is a billable ICD-10-CM diagnosis code for other specified zoonotic bacterial diseases, not elsewhere classified. 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 14 closely related codes. Coders also document this condition as actinobacillary mastitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Bacterial infections.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Actinobacillary mastitis
- Actinobacillosis caused by Actinobacillus equuli
- Actinobacillosis caused by Actinobacillus lignieresi
- Actinobacillosis caused by Actinobacillus salpingitis
- Actinobacillosis caused by Actinobacillus seminis
- Actinobacillosis caused by Actinobacillus suis
- Actinobacillus infection
- Pulmonary actinobacillosis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to A28.8: its own notes plus those printed at 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
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.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Disease, diseased See Also: Syndrome;
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Actinobacillosis
a disease characterized by suppurative and granulomatous lesions in the respiratory tract, upper alimentary tract, skin, kidneys, joints, and other tissues. actinobacillus lignieresii infects cattle and sheep while a. equuli infects horses and pigs.
Patient EducationClinical
Bacterial Infections
Bacteria are tiny organisms (living things) that have only one cell. Under a microscope, they look like balls, rods, or spirals. They can be found almost everywhere on Earth. There are lots of bacteria in and on your body. In fact, your body has about 10 times more bacteria cells than human cells.
The full article covers:
- What are bacteria?
- How do bacterial infections spread?
- What are the treatments for bacterial infections?
- Can bacterial infections be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert A28.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About A28.8Overview
What is the ICD-10 code for other specified zoonotic bacterial diseases, not elsewhere classified?
The ICD-10-CM code for other specified zoonotic bacterial diseases, not elsewhere classified is A28.8 (sometimes written as A288). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is A28.8 (Other zoonotic bacterial diseases, not elsewhere classified) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified zoonotic bacterial diseases, not elsewhere classified on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does A28.8 group to?
When other specified zoonotic bacterial diseases, not elsewhere classified 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 A28.8 a CC or MCC?
CMS lists A28.8 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 14 closely related codes in its exclusion list.
What is the ICD-9 equivalent of A28.8?
Under the General Equivalence Mappings, other specified zoonotic bacterial diseases, not elsewhere classified converts to ICD-9-CM 027.8 (zoonotic bact dis NEC). The mapping is approximate, so confirm the match fits the documentation.
