A04.9 Bacterial intestinal infection, unspecified

Billable ICD-10-CM code, FY2026. Acts as a Complication or Comorbidity (CC) as a secondary diagnosis.

Applicable to

• Bacterial enteritis NOS

Applies from A04 Other bacterial intestinal infections

Excludes1 (never code together)

• bacterial foodborne intoxications, NEC (A05.-)
• tuberculous enteritis (A18.32)

MS-DRG index

Defines the logic of DRG(s) 371-373 in MDC 06.

Approximate ICD-9-CM (GEMs)

• 008.5 Bacterial enteritis, unspecified

Code annotations containing back-references to A04.9

Back-references to A04

• Code First: M49 Spondylopathies in diseases classified elsewhere ("enterobacterial infections (A01-A04)")
• Type 2 Excludes: P37 Other congenital infectious and parasitic diseases ("infectious neonatal diarrhea (A00-A09)")

Diagnosis Index entries for A04.9

• Diarrhea, diarrheal (disease) (infantile) (inflammatory) › due to › bacteria
• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › bacterial
• Enteritis (acute) (diarrheal) (hemorrhagic) (noninfective) › infectious NOS › due to › bacteria NOS
• Spondylitis (chronic) › in (due to) › enterobacteria

Nearby codes

• A04.6 Enteritis due to Yersinia enterocolitica
• A04.7 Enterocolitis due to Clostridium difficile
• A04.71 Enterocolitis due to Clostridium difficile, recurrent
• A04.72 Enterocolitis due to Clostridium difficile, not specified as recurrent
• A04.8 Other specified bacterial intestinal infections
• A04.9 Bacterial intestinal infection, unspecified (this code)