A23.9

Brucellosis, unspecified

Billable FY2026 2025-10-01 → 2026-09-30

This is the unspecified option. 5 more specific codes sit alongside it. Worth checking whether the documentation supports one of them.

Exclusions 5 never code together

A00-B99chapter

Excludes1

certain localized infections - see body system-related chapters

Excludes2

carrier or suspected carrier of infectious disease (Z22.-)Z22.-
infectious and parasitic diseases complicating pregnancy, childbirth and the puerperium (O98.-)O98.-
infectious and parasitic diseases specific to the perinatal period (P35-P39)P35-P39
influenza and other acute respiratory infections (J00-J22)J00-J22

Excludes1 — never code together. The excluded condition and this one are mutually exclusive.

Excludes2 — not included here, but the patient may have both. Code both when documented.

Instructional notes 5

A23code

Includes

Malta fever
Mediterranean fever
undulant fever

A00-B99chapter

Includes

diseases generally recognized as communicable or transmissible

Use additional code

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

Index entries leading here 8

Infection, infected, infective (opportunistic) B99.9
- Brucella A23.9
Sepsis (generalized) (unspecified organism) A41.9
- Brucella A23.9
Spondylitis (chronic) — see also Spondylopathy, inflammatory
- in (due to)
  - brucellosis A23.9
    - thoracolumbar region A23.9
    - lumbosacral region A23.9
    - multiple sites A23.9
    - occipito-atlanto-axial region A23.9
    - sacrococcygeal region A23.9
    - thoracic region A23.9
    - cervical region A23.9
    - cervicothoracic region A23.9
    - lumbar region A23.9
Disorder (of) — see also Disease
- tubulo-interstitial (in)
  - brucellosis A23.9
Nephritis, nephritic (albuminuric) (azotemic) (congenital) (disseminated) (epithelial) (familial) (focal) (granulomatous) (hemorrhagic) (infantile) (nonsuppurative, excretory) (uremic) N05.9
- tubulo-interstitial (in) N12
  - due to
    - brucellosis A23.9
Pyelonephritis — see also Nephritis, tubulo-interstitial
- in (due to)
  - brucellosis A23.9
Brucellosis (infection) A23.9
- sepsis A23.9
- dermatitis A23.9
Fever (inanition) (of unknown origin) (persistent) (with chills) (with rigor) R50.9
- Malta A23.9
- Mediterranean A23.9

Alongside this code 5 same parent — A23

A23.0 Brucellosis due to Brucella melitensis A23.1 Brucellosis due to Brucella abortus A23.2 Brucellosis due to Brucella suis A23.3 Brucellosis due to Brucella canis A23.8 Other brucellosis

Medications 1

5 Brucellosis drugs

MED-RT files conditions by MeSH, which carves the world differently from ICD-10. These are name matches on this code's description, offered as candidates — not as an assertion that they are this code.

Additional references

AHA Coding Clinic® Licence required

Official coding advice for this code. Published by the American Hospital Association. Not included in this installation.

Risk adjustment

Maps to no condition category in any loaded model.

Presence is a property of the code. Untick a model to hide it everywhere.

This code

Billable: yes
Code set: FY2026
Parent: A23
Block: A20-A28
Siblings: 5

Present FY2024–FY2027.